[PATCH 4/4] REST: Add submission relations

Daniel Axtens dja at axtens.net
Sun Jan 12 00:20:28 AEDT 2020


Stephen Finucane <stephen at that.guru> writes:

> 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?
>

How would creating an relation work then? currently you POST to
/api/relations/ with all the patch IDs you want to include in the
relation. I agree that viewing relations through /api/patch makes sense,
but I'm not sure how you create relations if that's the only endpoint
you have?

Regards,
Daniel

> 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'),
>>      ]
>>  
>> +    api_1_2_patterns = [
>> +        url(r'^relations/$',
>> +            api_relation_views.SubmissionRelationList.as_view(),
>> +            name='api-relation-list'),
>> +        url(r'^relations/(?P<pk>[^/]+)/$',
>> +            api_relation_views.SubmissionRelationDetail.as_view(),
>> +            name='api-relation-detail'),
>> +    ]
>> +
>>      urlpatterns += [
>>          url(r'^api/(?:(?P<version>(1.0|1.1|1.2))/)?', include(api_patterns)),
>>          url(r'^api/(?:(?P<version>(1.1|1.2))/)?', include(api_1_1_patterns)),
>> +        url(r'^api/(?:(?P<version>1.2)/)?', include(api_1_2_patterns)),
>>  
>>          # token change
>>          url(r'^user/generate-token/$', user_views.generate_token,
>> diff --git a/releasenotes/notes/add-submission-relations-c96bb6c567b416d8.yaml b/releasenotes/notes/add-submission-relations-c96bb6c567b416d8.yaml
>> new file mode 100644
>> index 000000000000..cb877991cd55
>> --- /dev/null
>> +++ b/releasenotes/notes/add-submission-relations-c96bb6c567b416d8.yaml
>> @@ -0,0 +1,10 @@
>> +---
>> +features:
>> +  - |
>> +    Submissions (cover letters or patches) can now be related to other ones
>> +    (e.g. revisions). Relations can be set via the REST API by maintainers
>> +    (currently only for submissions of projects they maintain)
>> +api:
>> +  - |
>> +    Relations are available via ``/relations/`` and
>> +    ``/relations/{relationID}/`` endpoints.
>
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