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A Python package that exposes the Django model queryset aggregate functions to the DRF API.

Project description


PyPI version Build Status

Exposes aggregation features of the Django model queryset to the DRF API.


  • Python 3.6+
  • Django 1.11+
  • Django Rest Framework 3.5.3+


This renderer overwrites default behaviour for calls made to api v2 .agg endpoints.

Supports GET calls to list endpoints in the format:

endpoint.agg/?aggregate[Count]=(field to count)
endpoint.agg/?aggregate[Sum]=(field to sum)
endpoint.agg/?group_by[field to group by]&aggregate[Count]=id
endpoint.agg/?group_by[field to group by]&aggregate[Count]=id&aggregate[Sum]=(field to sum)

Supports date part extraction for aggregation:


Supports choices to representation extract:


Custom Aggregations

The default aggregate functions supported are defined in django.db.models.aggregates.

Custom aggregate functions have been defined in drf_aggregates.aggregates

User defined aggregation are passed to a custom queryset manager calculate_aggregates as kwargs if defined.

Custom aggregate functions set on the queryset should return a dictionary of field names to aggregate functions, which will then be processed with the other aggregates.


Example setup can be found in the example/ folder.

To enable the renderer, update your Django settings file:


In the Cars ViewSet we are outputting the result to json:

    def list(self, request, *args, **kwargs):
        queryset = self.filter_queryset(self.get_queryset())
        data = request.accepted_renderer.render({'queryset': queryset, 'request': request})
        return Response(data, content_type=f'application/json')


In order to run tests locally:

  1. Install development requirements:

    pip3 install -r requirements-dev.txt

  2. Update your environment to point to test Django settings file:

    export DJANGO_SETTINGS_MODULE=example.settings.test

  3. Run tests:


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