[PATCH 4/4] REST: Add submission relations

Mete Polat metepolat2000 at gmail.com
Fri Jan 3 04:23:22 AEDT 2020


On 30.12.19 21:28, Lukas Bulwahn wrote:
> On Mo., 30. Dez. 2019 at 11:41, Mete Polat <metepolat2000 at gmail.com> wrote:
> 
>> Hi Stephen,
>>
>> On 27.12.19 18:48, Stephen Finucane wrote:
>>> On Sat, 2019-12-07 at 17:46 +0100, Mete Polat wrote:
>>>> View relations and add/update/delete them as a maintainer. Maintainers
>>>> can only create relations of submissions (patches/cover letters) which
>>>> are part of a project they maintain.
>>>>
>>>> New REST API urls:
>>>> api/relations/
>>>> api/relations/<relation_id>/
>>>>
>>>> Co-authored-by: Daniel Axtens <dja at axtens.net>
>>>> Signed-off-by: Mete Polat <metepolat2000 at gmail.com>
>>>
>>> Why did you choose to expose this as a separate API rather than as a
>>> field on the '/patches' resource? While a 'Series' objet has enough
>>> separate metadata to warrant a separate '/series' resource, a
>>> 'SubmissionRelation' object is basically just a container. Including a
>>> 'related_patches' field on the detailed patch view would seem like more
>>> than enough detail for me, anyway, and unless there's a reason not to
>>> do this, I'd like to see it done that way. Is it possible?
>>>
>>
>> The first version of the series supported bulk creating/updating of
>> relations which was only possible by moving relations into their own url
>> [1]. As we deciced against bulk operations, I aggree that exposing a
>> related_patches field is the better choice now.
>>
> 
> 
> Mete, Stephen's proposal here is a simple quick refactoring of exposing
> this API, right?
> Could we get that change as a quick small v5 patch series for v2.2.0 ready?
> 

It's a small refractroring on the model site (patch 02/04) but not
really on the REST API. The Event API has to be extended and the tests +
permission model have to be adapted again as well. Unfortunately I won't
be available for this Lukas.

Best regards,

Mete

> Lukas
> 
> 
>> Best regards,
>>
>> Mete
>>
>> [1] Or allow bulk operations on /api/patch/ in general.
>>
>>> Stephen
>>>
>>> PS: I could have sworn I had asked this before, but I can't find any
>>> mails about it so maybe I didn't. Please tell me to RTML (read the
>>> mailing list) if so
>>>
>>>> ---
>>>> Optimize db queries:
>>>>   I have spent quite a lot of time in optimizing the db queries for the
>> REST API
>>>>   (thanks for the tip with the Django toolbar). Daniel stated that
>>>>   prefetch_related is possibly hitting the database for every relation
>> when
>>>>   prefetching submissions but it turns out that we can tell Django to
>> use a
>>>>   statement like:
>>>>       SELECT *
>>>>       FROM `patchwork_patch`
>>>>      INNER JOIN `patchwork_submission`
>>>>         ON (`patchwork_patch`.`submission_ptr_id` =
>> `patchwork_submission`.`id`)
>>>>      WHERE `patchwork_patch`.`submission_ptr_id` IN
>> (LIST_OF_ALL_SUBMISSION_IDS)
>>>>
>>>>    We do the same for `patchwork_coverletter`.
>>>>    This means we only hit the db two times for casting _all_
>> submissions to a
>>>>    patch or cover-letter.
>>>>
>>>>    Prefetching submissions__project eliminates similar and duplicate
>> queries
>>>>    that are used to determine whether a logged in user is at least
>> maintainer
>>>>    of one submission's project.
>>>>
>>>>  docs/api/schemas/latest/patchwork.yaml        | 273 +++++++++++++++++
>>>>  docs/api/schemas/patchwork.j2                 | 285 ++++++++++++++++++
>>>>  docs/api/schemas/v1.2/patchwork.yaml          | 273 +++++++++++++++++
>>>>  patchwork/api/embedded.py                     |  39 +++
>>>>  patchwork/api/index.py                        |   1 +
>>>>  patchwork/api/relation.py                     | 121 ++++++++
>>>>  patchwork/models.py                           |   6 +
>>>>  patchwork/tests/api/test_relation.py          | 181 +++++++++++
>>>>  patchwork/tests/utils.py                      |  15 +
>>>>  patchwork/urls.py                             |  11 +
>>>>  ...submission-relations-c96bb6c567b416d8.yaml |  10 +
>>>>  11 files changed, 1215 insertions(+)
>>>>  create mode 100644 patchwork/api/relation.py
>>>>  create mode 100644 patchwork/tests/api/test_relation.py
>>>>  create mode 100644
>> releasenotes/notes/add-submission-relations-c96bb6c567b416d8.yaml
>>>>
>>>> diff --git a/docs/api/schemas/latest/patchwork.yaml
>> b/docs/api/schemas/latest/patchwork.yaml
>>>> index a5e235be936d..7dd24fd700d5 100644
>>>> --- a/docs/api/schemas/latest/patchwork.yaml
>>>> +++ b/docs/api/schemas/latest/patchwork.yaml
>>>> @@ -1039,6 +1039,188 @@ paths:
>>>>                  $ref: '#/components/schemas/Error'
>>>>        tags:
>>>>          - series
>>>> +  /api/relations/:
>>>> +    get:
>>>> +      description: List relations.
>>>> +      operationId: relations_list
>>>> +      parameters:
>>>> +        - $ref: '#/components/parameters/Page'
>>>> +        - $ref: '#/components/parameters/PageSize'
>>>> +        - $ref: '#/components/parameters/Order'
>>>> +      responses:
>>>> +        '200':
>>>> +          description: ''
>>>> +          headers:
>>>> +            Link:
>>>> +              $ref: '#/components/headers/Link'
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                type: array
>>>> +                items:
>>>> +                  $ref: '#/components/schemas/Relation'
>>>> +      tags:
>>>> +        - relations
>>>> +    post:
>>>> +      description: Create a relation.
>>>> +      operationId: relations_create
>>>> +      security:
>>>> +        - basicAuth: []
>>>> +        - apiKeyAuth: []
>>>> +      requestBody:
>>>> +        $ref: '#/components/requestBodies/Relation'
>>>> +      responses:
>>>> +        '201':
>>>> +          description: ''
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Relation'
>>>> +        '400':
>>>> +          description: Invalid Request
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '403':
>>>> +          description: Forbidden
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '404':
>>>> +          description: Not found
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '409':
>>>> +          description: Conflict
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +      tags:
>>>> +        - checks
>>>> +  /api/relations/{id}/:
>>>> +    get:
>>>> +      description: Show a relation.
>>>> +      operationId: relation_read
>>>> +      parameters:
>>>> +        - in: path
>>>> +          name: id
>>>> +          description: A unique integer value identifying this
>> relation.
>>>> +          required: true
>>>> +          schema:
>>>> +            title: ID
>>>> +            type: integer
>>>> +      responses:
>>>> +        '200':
>>>> +          description: ''
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Relation'
>>>> +        '404':
>>>> +          description: Not found
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '409':
>>>> +          description: Conflict
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +      tags:
>>>> +        - relations
>>>> +    patch:
>>>> +      description: Update a relation (partial).
>>>> +      operationId: relations_partial_update
>>>> +      security:
>>>> +        - basicAuth: []
>>>> +        - apiKeyAuth: []
>>>> +      parameters:
>>>> +        - in: path
>>>> +          name: id
>>>> +          description: A unique integer value identifying this
>> relation.
>>>> +          required: true
>>>> +          schema:
>>>> +            title: ID
>>>> +            type: integer
>>>> +      requestBody:
>>>> +        $ref: '#/components/requestBodies/Relation'
>>>> +      responses:
>>>> +        '200':
>>>> +          description: ''
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Relation'
>>>> +        '400':
>>>> +          description: Bad request
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '403':
>>>> +          description: Forbidden
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '404':
>>>> +          description: Not found
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +      tags:
>>>> +        - relations
>>>> +    put:
>>>> +      description: Update a relation.
>>>> +      operationId: relations_update
>>>> +      security:
>>>> +        - basicAuth: []
>>>> +        - apiKeyAuth: []
>>>> +      parameters:
>>>> +        - in: path
>>>> +          name: id
>>>> +          description: A unique integer value identifying this
>> relation.
>>>> +          required: true
>>>> +          schema:
>>>> +            title: ID
>>>> +            type: integer
>>>> +      requestBody:
>>>> +        $ref: '#/components/requestBodies/Relation'
>>>> +      responses:
>>>> +        '200':
>>>> +          description: ''
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Relation'
>>>> +        '400':
>>>> +          description: Bad request
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '403':
>>>> +          description: Forbidden
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '404':
>>>> +          description: Not found
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +      tags:
>>>> +        - relations
>>>>    /api/users/:
>>>>      get:
>>>>        description: List users.
>>>> @@ -1314,6 +1496,18 @@ components:
>>>>          application/x-www-form-urlencoded:
>>>>            schema:
>>>>              $ref: '#/components/schemas/User'
>>>> +    Relation:
>>>> +      required: true
>>>> +      content:
>>>> +        application/json:
>>>> +          schema:
>>>> +            $ref: '#/components/schemas/RelationUpdate'
>>>> +        multipart/form-data:
>>>> +          schema:
>>>> +            $ref: '#/components/schemas/RelationUpdate'
>>>> +        application/x-www-form-urlencoded:
>>>> +          schema:
>>>> +            $ref: '#/components/schemas/RelationUpdate'
>>>>    schemas:
>>>>      Index:
>>>>        type: object
>>>> @@ -1358,6 +1552,11 @@ components:
>>>>            type: string
>>>>            format: uri
>>>>            readOnly: true
>>>> +        relations:
>>>> +          title: Relations URL
>>>> +          type: string
>>>> +          format: uri
>>>> +          readOnly: true
>>>>      Bundle:
>>>>        required:
>>>>          - name
>>>> @@ -1943,6 +2142,14 @@ components:
>>>>            title: Delegate
>>>>            type: integer
>>>>            nullable: true
>>>> +    RelationUpdate:
>>>> +      type: object
>>>> +      properties:
>>>> +        submissions:
>>>> +          title: Submission IDs
>>>> +          type: array
>>>> +          items:
>>>> +            type: integer
>>>>      Person:
>>>>        type: object
>>>>        properties:
>>>> @@ -2133,6 +2340,30 @@ components:
>>>>              $ref: '#/components/schemas/PatchEmbedded'
>>>>            readOnly: true
>>>>            uniqueItems: true
>>>> +    Relation:
>>>> +      type: object
>>>> +      properties:
>>>> +        id:
>>>> +          title: ID
>>>> +          type: integer
>>>> +        url:
>>>> +          title: URL
>>>> +          type: string
>>>> +          format: uri
>>>> +          readOnly: true
>>>> +        by:
>>>> +          type: object
>>>> +          title: By
>>>> +          readOnly: true
>>>> +          allOf:
>>>> +            - $ref: '#/components/schemas/UserEmbedded'
>>>> +        submissions:
>>>> +          title: Submissions
>>>> +          type: array
>>>> +          items:
>>>> +            $ref: '#/components/schemas/SubmissionEmbedded'
>>>> +          readOnly: true
>>>> +          uniqueItems: true
>>>>      User:
>>>>        type: object
>>>>        properties:
>>>> @@ -2211,6 +2442,48 @@ components:
>>>>            maxLength: 255
>>>>            minLength: 1
>>>>            readOnly: true
>>>> +    SubmissionEmbedded:
>>>> +      type: object
>>>> +      properties:
>>>> +        id:
>>>> +          title: ID
>>>> +          type: integer
>>>> +          readOnly: true
>>>> +        url:
>>>> +          title: URL
>>>> +          type: string
>>>> +          format: uri
>>>> +          readOnly: true
>>>> +        web_url:
>>>> +          title: Web URL
>>>> +          type: string
>>>> +          format: uri
>>>> +          readOnly: true
>>>> +        msgid:
>>>> +          title: Message ID
>>>> +          type: string
>>>> +          readOnly: true
>>>> +          minLength: 1
>>>> +        list_archive_url:
>>>> +          title: List archive URL
>>>> +          type: string
>>>> +          readOnly: true
>>>> +          nullable: true
>>>> +        date:
>>>> +          title: Date
>>>> +          type: string
>>>> +          format: iso8601
>>>> +          readOnly: true
>>>> +        name:
>>>> +          title: Name
>>>> +          type: string
>>>> +          readOnly: true
>>>> +          minLength: 1
>>>> +        mbox:
>>>> +          title: Mbox
>>>> +          type: string
>>>> +          format: uri
>>>> +          readOnly: true
>>>>      CoverLetterEmbedded:
>>>>        type: object
>>>>        properties:
>>>> diff --git a/docs/api/schemas/patchwork.j2
>> b/docs/api/schemas/patchwork.j2
>>>> index 196d78466b55..a034029accf9 100644
>>>> --- a/docs/api/schemas/patchwork.j2
>>>> +++ b/docs/api/schemas/patchwork.j2
>>>> @@ -1048,6 +1048,190 @@ paths:
>>>>                  $ref: '#/components/schemas/Error'
>>>>        tags:
>>>>          - series
>>>> +{% if version >= (1, 2) %}
>>>> +  /api/{{ version_url }}relations/:
>>>> +    get:
>>>> +      description: List relations.
>>>> +      operationId: relations_list
>>>> +      parameters:
>>>> +        - $ref: '#/components/parameters/Page'
>>>> +        - $ref: '#/components/parameters/PageSize'
>>>> +        - $ref: '#/components/parameters/Order'
>>>> +      responses:
>>>> +        '200':
>>>> +          description: ''
>>>> +          headers:
>>>> +            Link:
>>>> +              $ref: '#/components/headers/Link'
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                type: array
>>>> +                items:
>>>> +                  $ref: '#/components/schemas/Relation'
>>>> +      tags:
>>>> +        - relations
>>>> +    post:
>>>> +      description: Create a relation.
>>>> +      operationId: relations_create
>>>> +      security:
>>>> +        - basicAuth: []
>>>> +        - apiKeyAuth: []
>>>> +      requestBody:
>>>> +        $ref: '#/components/requestBodies/Relation'
>>>> +      responses:
>>>> +        '201':
>>>> +          description: ''
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Relation'
>>>> +        '400':
>>>> +          description: Invalid Request
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '403':
>>>> +          description: Forbidden
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '404':
>>>> +          description: Not found
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '409':
>>>> +          description: Conflict
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +      tags:
>>>> +        - checks
>>>> +  /api/{{ version_url }}relations/{id}/:
>>>> +    get:
>>>> +      description: Show a relation.
>>>> +      operationId: relation_read
>>>> +      parameters:
>>>> +        - in: path
>>>> +          name: id
>>>> +          description: A unique integer value identifying this
>> relation.
>>>> +          required: true
>>>> +          schema:
>>>> +            title: ID
>>>> +            type: integer
>>>> +      responses:
>>>> +        '200':
>>>> +          description: ''
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Relation'
>>>> +        '404':
>>>> +          description: Not found
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '409':
>>>> +          description: Conflict
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +      tags:
>>>> +        - relations
>>>> +    patch:
>>>> +      description: Update a relation (partial).
>>>> +      operationId: relations_partial_update
>>>> +      security:
>>>> +        - basicAuth: []
>>>> +        - apiKeyAuth: []
>>>> +      parameters:
>>>> +        - in: path
>>>> +          name: id
>>>> +          description: A unique integer value identifying this
>> relation.
>>>> +          required: true
>>>> +          schema:
>>>> +            title: ID
>>>> +            type: integer
>>>> +      requestBody:
>>>> +        $ref: '#/components/requestBodies/Relation'
>>>> +      responses:
>>>> +        '200':
>>>> +          description: ''
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Relation'
>>>> +        '400':
>>>> +          description: Bad request
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '403':
>>>> +          description: Forbidden
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '404':
>>>> +          description: Not found
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +      tags:
>>>> +        - relations
>>>> +    put:
>>>> +      description: Update a relation.
>>>> +      operationId: relations_update
>>>> +      security:
>>>> +        - basicAuth: []
>>>> +        - apiKeyAuth: []
>>>> +      parameters:
>>>> +        - in: path
>>>> +          name: id
>>>> +          description: A unique integer value identifying this
>> relation.
>>>> +          required: true
>>>> +          schema:
>>>> +            title: ID
>>>> +            type: integer
>>>> +      requestBody:
>>>> +        $ref: '#/components/requestBodies/Relation'
>>>> +      responses:
>>>> +        '200':
>>>> +          description: ''
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Relation'
>>>> +        '400':
>>>> +          description: Bad request
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '403':
>>>> +          description: Forbidden
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '404':
>>>> +          description: Not found
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +      tags:
>>>> +        - relations
>>>> +{% endif %}
>>>>    /api/{{ version_url }}users/:
>>>>      get:
>>>>        description: List users.
>>>> @@ -1325,6 +1509,20 @@ components:
>>>>          application/x-www-form-urlencoded:
>>>>            schema:
>>>>              $ref: '#/components/schemas/User'
>>>> +{% if version >= (1, 2) %}
>>>> +    Relation:
>>>> +      required: true
>>>> +      content:
>>>> +        application/json:
>>>> +          schema:
>>>> +            $ref: '#/components/schemas/RelationUpdate'
>>>> +        multipart/form-data:
>>>> +          schema:
>>>> +            $ref: '#/components/schemas/RelationUpdate'
>>>> +        application/x-www-form-urlencoded:
>>>> +          schema:
>>>> +            $ref: '#/components/schemas/RelationUpdate'
>>>> +{% endif %}
>>>>    schemas:
>>>>      Index:
>>>>        type: object
>>>> @@ -1369,6 +1567,13 @@ components:
>>>>            type: string
>>>>            format: uri
>>>>            readOnly: true
>>>> +{% if version >= (1, 2) %}
>>>> +        relations:
>>>> +          title: Relations URL
>>>> +          type: string
>>>> +          format: uri
>>>> +          readOnly: true
>>>> +{% endif %}
>>>>      Bundle:
>>>>        required:
>>>>          - name
>>>> @@ -1981,6 +2186,16 @@ components:
>>>>            title: Delegate
>>>>            type: integer
>>>>            nullable: true
>>>> +{% if version >= (1, 2) %}
>>>> +    RelationUpdate:
>>>> +      type: object
>>>> +      properties:
>>>> +        submissions:
>>>> +          title: Submission IDs
>>>> +          type: array
>>>> +          items:
>>>> +            type: integer
>>>> +{% endif %}
>>>>      Person:
>>>>        type: object
>>>>        properties:
>>>> @@ -2177,6 +2392,32 @@ components:
>>>>              $ref: '#/components/schemas/PatchEmbedded'
>>>>            readOnly: true
>>>>            uniqueItems: true
>>>> +{% if version >= (1, 2) %}
>>>> +    Relation:
>>>> +      type: object
>>>> +      properties:
>>>> +        id:
>>>> +          title: ID
>>>> +          type: integer
>>>> +        url:
>>>> +          title: URL
>>>> +          type: string
>>>> +          format: uri
>>>> +          readOnly: true
>>>> +        by:
>>>> +          type: object
>>>> +          title: By
>>>> +          readOnly: true
>>>> +          allOf:
>>>> +            - $ref: '#/components/schemas/UserEmbedded'
>>>> +        submissions:
>>>> +          title: Submissions
>>>> +          type: array
>>>> +          items:
>>>> +            $ref: '#/components/schemas/SubmissionEmbedded'
>>>> +          readOnly: true
>>>> +          uniqueItems: true
>>>> +{% endif %}
>>>>      User:
>>>>        type: object
>>>>        properties:
>>>> @@ -2255,6 +2496,50 @@ components:
>>>>            maxLength: 255
>>>>            minLength: 1
>>>>            readOnly: true
>>>> +{% if version >= (1, 2) %}
>>>> +    SubmissionEmbedded:
>>>> +      type: object
>>>> +      properties:
>>>> +        id:
>>>> +          title: ID
>>>> +          type: integer
>>>> +          readOnly: true
>>>> +        url:
>>>> +          title: URL
>>>> +          type: string
>>>> +          format: uri
>>>> +          readOnly: true
>>>> +        web_url:
>>>> +          title: Web URL
>>>> +          type: string
>>>> +          format: uri
>>>> +          readOnly: true
>>>> +        msgid:
>>>> +          title: Message ID
>>>> +          type: string
>>>> +          readOnly: true
>>>> +          minLength: 1
>>>> +        list_archive_url:
>>>> +          title: List archive URL
>>>> +          type: string
>>>> +          readOnly: true
>>>> +          nullable: true
>>>> +        date:
>>>> +          title: Date
>>>> +          type: string
>>>> +          format: iso8601
>>>> +          readOnly: true
>>>> +        name:
>>>> +          title: Name
>>>> +          type: string
>>>> +          readOnly: true
>>>> +          minLength: 1
>>>> +        mbox:
>>>> +          title: Mbox
>>>> +          type: string
>>>> +          format: uri
>>>> +          readOnly: true
>>>> +{% endif %}
>>>>      CoverLetterEmbedded:
>>>>        type: object
>>>>        properties:
>>>> diff --git a/docs/api/schemas/v1.2/patchwork.yaml
>> b/docs/api/schemas/v1.2/patchwork.yaml
>>>> index d7b4d2957cff..99425e968881 100644
>>>> --- a/docs/api/schemas/v1.2/patchwork.yaml
>>>> +++ b/docs/api/schemas/v1.2/patchwork.yaml
>>>> @@ -1039,6 +1039,188 @@ paths:
>>>>                  $ref: '#/components/schemas/Error'
>>>>        tags:
>>>>          - series
>>>> +  /api/1.2/relations/:
>>>> +    get:
>>>> +      description: List relations.
>>>> +      operationId: relations_list
>>>> +      parameters:
>>>> +        - $ref: '#/components/parameters/Page'
>>>> +        - $ref: '#/components/parameters/PageSize'
>>>> +        - $ref: '#/components/parameters/Order'
>>>> +      responses:
>>>> +        '200':
>>>> +          description: ''
>>>> +          headers:
>>>> +            Link:
>>>> +              $ref: '#/components/headers/Link'
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                type: array
>>>> +                items:
>>>> +                  $ref: '#/components/schemas/Relation'
>>>> +      tags:
>>>> +        - relations
>>>> +    post:
>>>> +      description: Create a relation.
>>>> +      operationId: relations_create
>>>> +      security:
>>>> +        - basicAuth: []
>>>> +        - apiKeyAuth: []
>>>> +      requestBody:
>>>> +        $ref: '#/components/requestBodies/Relation'
>>>> +      responses:
>>>> +        '201':
>>>> +          description: ''
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Relation'
>>>> +        '400':
>>>> +          description: Invalid Request
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '403':
>>>> +          description: Forbidden
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '404':
>>>> +          description: Not found
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '409':
>>>> +          description: Conflict
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +      tags:
>>>> +        - checks
>>>> +  /api/1.2/relations/{id}/:
>>>> +    get:
>>>> +      description: Show a relation.
>>>> +      operationId: relation_read
>>>> +      parameters:
>>>> +        - in: path
>>>> +          name: id
>>>> +          description: A unique integer value identifying this
>> relation.
>>>> +          required: true
>>>> +          schema:
>>>> +            title: ID
>>>> +            type: integer
>>>> +      responses:
>>>> +        '200':
>>>> +          description: ''
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Relation'
>>>> +        '404':
>>>> +          description: Not found
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '409':
>>>> +          description: Conflict
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +      tags:
>>>> +        - relations
>>>> +    patch:
>>>> +      description: Update a relation (partial).
>>>> +      operationId: relations_partial_update
>>>> +      security:
>>>> +        - basicAuth: []
>>>> +        - apiKeyAuth: []
>>>> +      parameters:
>>>> +        - in: path
>>>> +          name: id
>>>> +          description: A unique integer value identifying this
>> relation.
>>>> +          required: true
>>>> +          schema:
>>>> +            title: ID
>>>> +            type: integer
>>>> +      requestBody:
>>>> +        $ref: '#/components/requestBodies/Relation'
>>>> +      responses:
>>>> +        '200':
>>>> +          description: ''
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Relation'
>>>> +        '400':
>>>> +          description: Bad request
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '403':
>>>> +          description: Forbidden
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '404':
>>>> +          description: Not found
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +      tags:
>>>> +        - relations
>>>> +    put:
>>>> +      description: Update a relation.
>>>> +      operationId: relations_update
>>>> +      security:
>>>> +        - basicAuth: []
>>>> +        - apiKeyAuth: []
>>>> +      parameters:
>>>> +        - in: path
>>>> +          name: id
>>>> +          description: A unique integer value identifying this
>> relation.
>>>> +          required: true
>>>> +          schema:
>>>> +            title: ID
>>>> +            type: integer
>>>> +      requestBody:
>>>> +        $ref: '#/components/requestBodies/Relation'
>>>> +      responses:
>>>> +        '200':
>>>> +          description: ''
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Relation'
>>>> +        '400':
>>>> +          description: Bad request
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '403':
>>>> +          description: Forbidden
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +        '404':
>>>> +          description: Not found
>>>> +          content:
>>>> +            application/json:
>>>> +              schema:
>>>> +                $ref: '#/components/schemas/Error'
>>>> +      tags:
>>>> +        - relations
>>>>    /api/1.2/users/:
>>>>      get:
>>>>        description: List users.
>>>> @@ -1314,6 +1496,18 @@ components:
>>>>          application/x-www-form-urlencoded:
>>>>            schema:
>>>>              $ref: '#/components/schemas/User'
>>>> +    Relation:
>>>> +      required: true
>>>> +      content:
>>>> +        application/json:
>>>> +          schema:
>>>> +            $ref: '#/components/schemas/RelationUpdate'
>>>> +        multipart/form-data:
>>>> +          schema:
>>>> +            $ref: '#/components/schemas/RelationUpdate'
>>>> +        application/x-www-form-urlencoded:
>>>> +          schema:
>>>> +            $ref: '#/components/schemas/RelationUpdate'
>>>>    schemas:
>>>>      Index:
>>>>        type: object
>>>> @@ -1358,6 +1552,11 @@ components:
>>>>            type: string
>>>>            format: uri
>>>>            readOnly: true
>>>> +        relations:
>>>> +          title: Relations URL
>>>> +          type: string
>>>> +          format: uri
>>>> +          readOnly: true
>>>>      Bundle:
>>>>        required:
>>>>          - name
>>>> @@ -1943,6 +2142,14 @@ components:
>>>>            title: Delegate
>>>>            type: integer
>>>>            nullable: true
>>>> +    RelationUpdate:
>>>> +      type: object
>>>> +      properties:
>>>> +        submissions:
>>>> +          title: Submission IDs
>>>> +          type: array
>>>> +          items:
>>>> +            type: integer
>>>>      Person:
>>>>        type: object
>>>>        properties:
>>>> @@ -2133,6 +2340,30 @@ components:
>>>>              $ref: '#/components/schemas/PatchEmbedded'
>>>>            readOnly: true
>>>>            uniqueItems: true
>>>> +    Relation:
>>>> +      type: object
>>>> +      properties:
>>>> +        id:
>>>> +          title: ID
>>>> +          type: integer
>>>> +        url:
>>>> +          title: URL
>>>> +          type: string
>>>> +          format: uri
>>>> +          readOnly: true
>>>> +        by:
>>>> +          type: object
>>>> +          title: By
>>>> +          readOnly: true
>>>> +          allOf:
>>>> +            - $ref: '#/components/schemas/UserEmbedded'
>>>> +        submissions:
>>>> +          title: Submissions
>>>> +          type: array
>>>> +          items:
>>>> +            $ref: '#/components/schemas/SubmissionEmbedded'
>>>> +          readOnly: true
>>>> +          uniqueItems: true
>>>>      User:
>>>>        type: object
>>>>        properties:
>>>> @@ -2211,6 +2442,48 @@ components:
>>>>            maxLength: 255
>>>>            minLength: 1
>>>>            readOnly: true
>>>> +    SubmissionEmbedded:
>>>> +      type: object
>>>> +      properties:
>>>> +        id:
>>>> +          title: ID
>>>> +          type: integer
>>>> +          readOnly: true
>>>> +        url:
>>>> +          title: URL
>>>> +          type: string
>>>> +          format: uri
>>>> +          readOnly: true
>>>> +        web_url:
>>>> +          title: Web URL
>>>> +          type: string
>>>> +          format: uri
>>>> +          readOnly: true
>>>> +        msgid:
>>>> +          title: Message ID
>>>> +          type: string
>>>> +          readOnly: true
>>>> +          minLength: 1
>>>> +        list_archive_url:
>>>> +          title: List archive URL
>>>> +          type: string
>>>> +          readOnly: true
>>>> +          nullable: true
>>>> +        date:
>>>> +          title: Date
>>>> +          type: string
>>>> +          format: iso8601
>>>> +          readOnly: true
>>>> +        name:
>>>> +          title: Name
>>>> +          type: string
>>>> +          readOnly: true
>>>> +          minLength: 1
>>>> +        mbox:
>>>> +          title: Mbox
>>>> +          type: string
>>>> +          format: uri
>>>> +          readOnly: true
>>>>      CoverLetterEmbedded:
>>>>        type: object
>>>>        properties:
>>>> diff --git a/patchwork/api/embedded.py b/patchwork/api/embedded.py
>>>> index de4f31165ee7..0fba291b62b8 100644
>>>> --- a/patchwork/api/embedded.py
>>>> +++ b/patchwork/api/embedded.py
>>>> @@ -102,6 +102,45 @@ class CheckSerializer(SerializedRelatedField):
>>>>              }
>>>>
>>>>
>>>> +def _upgrade_instance(instance):
>>>> +    if hasattr(instance, 'patch'):
>>>> +        return instance.patch
>>>> +    else:
>>>> +        return instance.coverletter
>>>> +
>>>> +
>>>> +class SubmissionSerializer(SerializedRelatedField):
>>>> +
>>>> +    class _Serializer(BaseHyperlinkedModelSerializer):
>>>> +        """We need to 'upgrade' or specialise the submission to the
>> relevant
>>>> +        subclass, so we can't use the mixins. This is gross but can go
>> away
>>>> +        once we flatten the models."""
>>>> +        url = SerializerMethodField()
>>>> +        web_url = SerializerMethodField()
>>>> +        mbox = SerializerMethodField()
>>>> +
>>>> +        def get_url(self, instance):
>>>> +            instance = _upgrade_instance(instance)
>>>> +            request = self.context.get('request')
>>>> +            return
>> request.build_absolute_uri(instance.get_absolute_api_url())
>>>> +
>>>> +        def get_web_url(self, instance):
>>>> +            instance = _upgrade_instance(instance)
>>>> +            request = self.context.get('request')
>>>> +            return
>> request.build_absolute_uri(instance.get_absolute_url())
>>>> +
>>>> +        def get_mbox(self, instance):
>>>> +            instance = _upgrade_instance(instance)
>>>> +            request = self.context.get('request')
>>>> +            return request.build_absolute_uri(instance.get_mbox_url())
>>>> +
>>>> +        class Meta:
>>>> +            model = models.Submission
>>>> +            fields = ('id', 'url', 'web_url', 'msgid',
>> 'list_archive_url',
>>>> +                      'date', 'name', 'mbox')
>>>> +            read_only_fields = fields
>>>> +
>>>> +
>>>>  class CoverLetterSerializer(SerializedRelatedField):
>>>>
>>>>      class _Serializer(MboxMixin, WebURLMixin,
>> BaseHyperlinkedModelSerializer):
>>>> diff --git a/patchwork/api/index.py b/patchwork/api/index.py
>>>> index 45485c9106f6..cf1845393835 100644
>>>> --- a/patchwork/api/index.py
>>>> +++ b/patchwork/api/index.py
>>>> @@ -21,4 +21,5 @@ class IndexView(APIView):
>>>>              'series': reverse('api-series-list', request=request),
>>>>              'events': reverse('api-event-list', request=request),
>>>>              'bundles': reverse('api-bundle-list', request=request),
>>>> +            'relations': reverse('api-relation-list', request=request),
>>>>          })
>>>> diff --git a/patchwork/api/relation.py b/patchwork/api/relation.py
>>>> new file mode 100644
>>>> index 000000000000..37640d62e9cc
>>>> --- /dev/null
>>>> +++ b/patchwork/api/relation.py
>>>> @@ -0,0 +1,121 @@
>>>> +# Patchwork - automated patch tracking system
>>>> +# Copyright (C) 2019, Bayerische Motoren Werke Aktiengesellschaft (BMW
>> AG)
>>>> +#
>>>> +# SPDX-License-Identifier: GPL-2.0-or-later
>>>> +
>>>> +from rest_framework import permissions
>>>> +from rest_framework import status
>>>> +from rest_framework.exceptions import PermissionDenied, APIException
>>>> +from rest_framework.generics import GenericAPIView
>>>> +from rest_framework.generics import ListCreateAPIView
>>>> +from rest_framework.generics import RetrieveUpdateDestroyAPIView
>>>> +from rest_framework.serializers import ModelSerializer
>>>> +
>>>> +from patchwork.api.base import PatchworkPermission
>>>> +from patchwork.api.embedded import SubmissionSerializer
>>>> +from patchwork.api.embedded import UserSerializer
>>>> +from patchwork.models import SubmissionRelation
>>>> +
>>>> +
>>>> +class MaintainerPermission(PatchworkPermission):
>>>> +
>>>> +    def has_permission(self, request, view):
>>>> +        if request.method in permissions.SAFE_METHODS:
>>>> +            return True
>>>> +
>>>> +        # Prevent showing an HTML POST form in the browseable API for
>> logged in
>>>> +        # users who are not maintainers.
>>>> +        return len(request.user.maintains) > 0
>>>> +
>>>> +    def has_object_permission(self, request, view, relation):
>>>> +        if request.method in permissions.SAFE_METHODS:
>>>> +            return True
>>>> +
>>>> +        maintains = request.user.maintains
>>>> +        submissions = relation.submissions.all()
>>>> +        # user has to be maintainer of every project a submission is
>> part of
>>>> +        return self.check_user_maintains_all(maintains, submissions)
>>>> +
>>>> +    @staticmethod
>>>> +    def check_user_maintains_all(maintains, submissions):
>>>> +        if any(s.project not in maintains for s in submissions):
>>>> +            detail = 'At least one submission is part of a project you
>> are ' \
>>>> +                     'not maintaining.'
>>>> +            raise PermissionDenied(detail=detail)
>>>> +        return True
>>>> +
>>>> +
>>>> +class SubmissionConflict(APIException):
>>>> +    status_code = status.HTTP_409_CONFLICT
>>>> +    default_detail = 'At least one submission is already part of
>> another ' \
>>>> +                     'relation. You have to explicitly remove a
>> submission ' \
>>>> +                     'from its existing relation before moving it to
>> this one.'
>>>> +
>>>> +
>>>> +class SubmissionRelationSerializer(ModelSerializer):
>>>> +    by = UserSerializer(read_only=True)
>>>> +    submissions = SubmissionSerializer(many=True)
>>>> +
>>>> +    def create(self, validated_data):
>>>> +        submissions = validated_data['submissions']
>>>> +        if any(submission.related_id is not None
>>>> +               for submission in submissions):
>>>> +            raise SubmissionConflict()
>>>> +        return super(SubmissionRelationSerializer,
>> self).create(validated_data)
>>>> +
>>>> +    def update(self, instance, validated_data):
>>>> +        submissions = validated_data['submissions']
>>>> +        if any(submission.related_id is not None and
>>>> +               submission.related_id != instance.id
>>>> +               for submission in submissions):
>>>> +            raise SubmissionConflict()
>>>> +        return super(SubmissionRelationSerializer, self) \
>>>> +            .update(instance, validated_data)
>>>> +
>>>> +    class Meta:
>>>> +        model = SubmissionRelation
>>>> +        fields = ('id', 'url', 'by', 'submissions',)
>>>> +        read_only_fields = ('url', 'by', )
>>>> +        extra_kwargs = {
>>>> +            'url': {'view_name': 'api-relation-detail'},
>>>> +        }
>>>> +
>>>> +
>>>> +class SubmissionRelationMixin(GenericAPIView):
>>>> +    serializer_class = SubmissionRelationSerializer
>>>> +    permission_classes = (MaintainerPermission,)
>>>> +
>>>> +    def initial(self, request, *args, **kwargs):
>>>> +        user = request.user
>>>> +        if not hasattr(user, 'maintains'):
>>>> +            if user.is_authenticated:
>>>> +                user.maintains = user.profile.maintainer_projects.all()
>>>> +            else:
>>>> +                user.maintains = []
>>>> +        super(SubmissionRelationMixin, self).initial(request, *args,
>> **kwargs)
>>>> +
>>>> +    def get_queryset(self):
>>>> +        return SubmissionRelation.objects.all() \
>>>> +            .select_related('by') \
>>>> +            .prefetch_related('submissions__patch',
>>>> +                              'submissions__coverletter',
>>>> +                              'submissions__project')
>>>> +
>>>> +
>>>> +class SubmissionRelationList(SubmissionRelationMixin,
>> ListCreateAPIView):
>>>> +    ordering = 'id'
>>>> +    ordering_fields = ['id']
>>>> +
>>>> +    def perform_create(self, serializer):
>>>> +        # has_object_permission() is not called when creating a new
>> relation.
>>>> +        # Check whether user is maintainer of every project a
>> submission is
>>>> +        # part of
>>>> +        maintains = self.request.user.maintains
>>>> +        submissions = serializer.validated_data['submissions']
>>>> +        MaintainerPermission.check_user_maintains_all(maintains,
>> submissions)
>>>> +        serializer.save(by=self.request.user)
>>>> +
>>>> +
>>>> +class SubmissionRelationDetail(SubmissionRelationMixin,
>>>> +                               RetrieveUpdateDestroyAPIView):
>>>> +    pass
>>>> diff --git a/patchwork/models.py b/patchwork/models.py
>>>> index a92203b24ff2..9ae3370e896b 100644
>>>> --- a/patchwork/models.py
>>>> +++ b/patchwork/models.py
>>>> @@ -415,6 +415,9 @@ class CoverLetter(Submission):
>>>>                         kwargs={'project_id': self.project.linkname,
>>>>                                 'msgid': self.url_msgid})
>>>>
>>>> +    def get_absolute_api_url(self):
>>>> +        return reverse('api-cover-detail', kwargs={'pk': self.id})
>>>> +
>>>>      def get_mbox_url(self):
>>>>          return reverse('cover-mbox',
>>>>                         kwargs={'project_id': self.project.linkname,
>>>> @@ -604,6 +607,9 @@ class Patch(Submission):
>>>>                         kwargs={'project_id': self.project.linkname,
>>>>                                 'msgid': self.url_msgid})
>>>>
>>>> +    def get_absolute_api_url(self):
>>>> +        return reverse('api-patch-detail', kwargs={'pk': self.id})
>>>> +
>>>>      def get_mbox_url(self):
>>>>          return reverse('patch-mbox',
>>>>                         kwargs={'project_id': self.project.linkname,
>>>> diff --git a/patchwork/tests/api/test_relation.py
>> b/patchwork/tests/api/test_relation.py
>>>> new file mode 100644
>>>> index 000000000000..5b1a04f13670
>>>> --- /dev/null
>>>> +++ b/patchwork/tests/api/test_relation.py
>>>> @@ -0,0 +1,181 @@
>>>> +# Patchwork - automated patch tracking system
>>>> +# Copyright (C) 2019, Bayerische Motoren Werke Aktiengesellschaft (BMW
>> AG)
>>>> +#
>>>> +# SPDX-License-Identifier: GPL-2.0-or-later
>>>> +
>>>> +import unittest
>>>> +
>>>> +import six
>>>> +from django.conf import settings
>>>> +from django.urls import reverse
>>>> +
>>>> +from patchwork.tests.api import utils
>>>> +from patchwork.tests.utils import create_cover
>>>> +from patchwork.tests.utils import create_maintainer
>>>> +from patchwork.tests.utils import create_patches
>>>> +from patchwork.tests.utils import create_project
>>>> +from patchwork.tests.utils import create_relation
>>>> +from patchwork.tests.utils import create_user
>>>> +
>>>> +if settings.ENABLE_REST_API:
>>>> +    from rest_framework import status
>>>> +
>>>> +
>>>> +class UserType:
>>>> +    ANONYMOUS = 1
>>>> +    NON_MAINTAINER = 2
>>>> +    MAINTAINER = 3
>>>> +
>>>> +
>>>> + at unittest.skipUnless(settings.ENABLE_REST_API, 'requires
>> ENABLE_REST_API')
>>>> +class TestRelationAPI(utils.APITestCase):
>>>> +    fixtures = ['default_tags']
>>>> +
>>>> +    @staticmethod
>>>> +    def api_url(item=None):
>>>> +        kwargs = {}
>>>> +        if item is None:
>>>> +            return reverse('api-relation-list', kwargs=kwargs)
>>>> +        kwargs['pk'] = item
>>>> +        return reverse('api-relation-detail', kwargs=kwargs)
>>>> +
>>>> +    def request_restricted(self, method, user_type):
>>>> +        """Assert post/delete/patch requests on the relation API."""
>>>> +        assert method in ['post', 'delete', 'patch']
>>>> +
>>>> +        # setup
>>>> +
>>>> +        project = create_project()
>>>> +        maintainer = create_maintainer(project)
>>>> +
>>>> +        if user_type == UserType.ANONYMOUS:
>>>> +            expected_status = status.HTTP_403_FORBIDDEN
>>>> +        elif user_type == UserType.NON_MAINTAINER:
>>>> +            expected_status = status.HTTP_403_FORBIDDEN
>>>> +            self.client.force_authenticate(user=create_user())
>>>> +        elif user_type == UserType.MAINTAINER:
>>>> +            if method == 'post':
>>>> +                expected_status = status.HTTP_201_CREATED
>>>> +            elif method == 'delete':
>>>> +                expected_status = status.HTTP_204_NO_CONTENT
>>>> +            else:
>>>> +                expected_status = status.HTTP_200_OK
>>>> +            self.client.force_authenticate(user=maintainer)
>>>> +        else:
>>>> +            raise ValueError
>>>> +
>>>> +        resource_id = None
>>>> +        req = None
>>>> +
>>>> +        if method == 'delete':
>>>> +            resource_id = create_relation(project=project,
>> by=maintainer).id
>>>> +        elif method == 'post':
>>>> +            patch_ids = [p.id for p in create_patches(2,
>> project=project)]
>>>> +            req = {'submissions': patch_ids}
>>>> +        elif method == 'patch':
>>>> +            resource_id = create_relation(project=project,
>> by=maintainer).id
>>>> +            patch_ids = [p.id for p in create_patches(2,
>> project=project)]
>>>> +            req = {'submissions': patch_ids}
>>>> +        else:
>>>> +            raise ValueError
>>>> +
>>>> +        # request
>>>> +
>>>> +        resp = getattr(self.client, method)(self.api_url(resource_id),
>> req)
>>>> +
>>>> +        # check
>>>> +
>>>> +        self.assertEqual(expected_status, resp.status_code)
>>>> +
>>>> +        if resp.status_code in range(status.HTTP_200_OK,
>>>> +                                     status.HTTP_204_NO_CONTENT):
>>>> +            self.assertRequest(req, resp.data)
>>>> +
>>>> +    def assertRequest(self, request, resp):
>>>> +        if request.get('id'):
>>>> +            self.assertEqual(request['id'], resp['id'])
>>>> +        send_ids = request['submissions']
>>>> +        resp_ids = [s['id'] for s in resp['submissions']]
>>>> +        six.assertCountEqual(self, resp_ids, send_ids)
>>>> +
>>>> +    def assertSerialized(self, obj, resp):
>>>> +        self.assertEqual(obj.id, resp['id'])
>>>> +        exp_ids = [s.id for s in obj.submissions.all()]
>>>> +        act_ids = [s['id'] for s in resp['submissions']]
>>>> +        six.assertCountEqual(self, exp_ids, act_ids)
>>>> +
>>>> +    def test_list_empty(self):
>>>> +        """List relation when none are present."""
>>>> +        resp = self.client.get(self.api_url())
>>>> +        self.assertEqual(status.HTTP_200_OK, resp.status_code)
>>>> +        self.assertEqual(0, len(resp.data))
>>>> +
>>>> +    @utils.store_samples('relation-list')
>>>> +    def test_list(self):
>>>> +        """List relations."""
>>>> +        relation = create_relation()
>>>> +
>>>> +        resp = self.client.get(self.api_url())
>>>> +        self.assertEqual(status.HTTP_200_OK, resp.status_code)
>>>> +        self.assertEqual(1, len(resp.data))
>>>> +        self.assertSerialized(relation, resp.data[0])
>>>> +
>>>> +    def test_detail(self):
>>>> +        """Show relation."""
>>>> +        relation = create_relation()
>>>> +
>>>> +        resp = self.client.get(self.api_url(relation.id))
>>>> +        self.assertEqual(status.HTTP_200_OK, resp.status_code)
>>>> +        self.assertSerialized(relation, resp.data)
>>>> +
>>>> +    @utils.store_samples('relation-create-error-forbidden')
>>>> +    def test_create_anonymous(self):
>>>> +        self.request_restricted('post', UserType.ANONYMOUS)
>>>> +
>>>> +    def test_create_non_maintainer(self):
>>>> +        self.request_restricted('post', UserType.NON_MAINTAINER)
>>>> +
>>>> +    @utils.store_samples('relation-create')
>>>> +    def test_create_maintainer(self):
>>>> +        self.request_restricted('post', UserType.MAINTAINER)
>>>> +
>>>> +    @utils.store_samples('relation-update-error-forbidden')
>>>> +    def test_update_anonymous(self):
>>>> +        self.request_restricted('patch', UserType.ANONYMOUS)
>>>> +
>>>> +    def test_update_non_maintainer(self):
>>>> +        self.request_restricted('patch', UserType.NON_MAINTAINER)
>>>> +
>>>> +    @utils.store_samples('relation-update')
>>>> +    def test_update_maintainer(self):
>>>> +        self.request_restricted('patch', UserType.MAINTAINER)
>>>> +
>>>> +    @utils.store_samples('relation-delete-error-forbidden')
>>>> +    def test_delete_anonymous(self):
>>>> +        self.request_restricted('delete', UserType.ANONYMOUS)
>>>> +
>>>> +    def test_delete_non_maintainer(self):
>>>> +        self.request_restricted('delete', UserType.NON_MAINTAINER)
>>>> +
>>>> +    @utils.store_samples('relation-update')
>>>> +    def test_delete_maintainer(self):
>>>> +        self.request_restricted('delete', UserType.MAINTAINER)
>>>> +
>>>> +    def test_submission_conflict(self):
>>>> +        project = create_project()
>>>> +        maintainer = create_maintainer(project)
>>>> +        self.client.force_authenticate(user=maintainer)
>>>> +        relation = create_relation(by=maintainer, project=project)
>>>> +        submission_ids = [s.id for s in relation.submissions.all()]
>>>> +
>>>> +        # try to create a new relation with a new submission (cover)
>> and
>>>> +        # submissions already bound to another relation
>>>> +        cover = create_cover(project=project)
>>>> +        submission_ids.append(cover.id)
>>>> +        req = {'submissions': submission_ids}
>>>> +        resp = self.client.post(self.api_url(), req)
>>>> +        self.assertEqual(status.HTTP_409_CONFLICT, resp.status_code)
>>>> +
>>>> +        # try to patch relation
>>>> +        resp = self.client.patch(self.api_url(relation.id), req)
>>>> +        self.assertEqual(status.HTTP_200_OK, resp.status_code)
>>>> diff --git a/patchwork/tests/utils.py b/patchwork/tests/utils.py
>>>> index 577183d0986c..ffe90976233e 100644
>>>> --- a/patchwork/tests/utils.py
>>>> +++ b/patchwork/tests/utils.py
>>>> @@ -16,6 +16,7 @@ from patchwork.models import Check
>>>>  from patchwork.models import Comment
>>>>  from patchwork.models import CoverLetter
>>>>  from patchwork.models import Patch
>>>> +from patchwork.models import SubmissionRelation
>>>>  from patchwork.models import Person
>>>>  from patchwork.models import Project
>>>>  from patchwork.models import Series
>>>> @@ -347,3 +348,17 @@ def create_covers(count=1, **kwargs):
>>>>          kwargs (dict): Overrides for various cover letter fields
>>>>      """
>>>>      return _create_submissions(create_cover, count, **kwargs)
>>>> +
>>>> +
>>>> +def create_relation(count_patches=2, by=None, **kwargs):
>>>> +    if not by:
>>>> +        project = create_project()
>>>> +        kwargs['project'] = project
>>>> +        by = create_maintainer(project)
>>>> +    relation = SubmissionRelation.objects.create(by=by)
>>>> +    values = {
>>>> +        'related': relation
>>>> +    }
>>>> +    values.update(kwargs)
>>>> +    create_patches(count_patches, **values)
>>>> +    return relation
>>>> diff --git a/patchwork/urls.py b/patchwork/urls.py
>>>> index dcdcfb49e67e..92095f62c7b9 100644
>>>> --- a/patchwork/urls.py
>>>> +++ b/patchwork/urls.py
>>>> @@ -187,6 +187,7 @@ if settings.ENABLE_REST_API:
>>>>      from patchwork.api import patch as api_patch_views  # noqa
>>>>      from patchwork.api import person as api_person_views  # noqa
>>>>      from patchwork.api import project as api_project_views  # noqa
>>>> +    from patchwork.api import relation as api_relation_views  # noqa
>>>>      from patchwork.api import series as api_series_views  # noqa
>>>>      from patchwork.api import user as api_user_views  # noqa
>>>>
>>>> @@ -256,9 +257,19 @@ if settings.ENABLE_REST_API:
>>>>              name='api-cover-comment-list'),
>>>>      ]
>>>>
>>>> +


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