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A django app to apply filters on drf querysets using query params with validations using voluptuous.

Project description

# drf-url-filters

**drf-url-filters** is a simple django app to apply filters on drf
modelviewset's queryset in a clean, simple and configurable way. It also
supports validations on incoming query params and their values. A beautiful
python package [voluptouos]( is being
used for validations on the incoming query parameters. The best part about
voluptouos is you can define your own validations as per your query params

# Quick start

1. Download `drf-url-filters` app package from this git repo or can be
installed using python-pip like `pip install drf-url-filters`.

2. Add `filters` in INSTALLED_APPS of file of django project.

**How it works?**

1. Your View or ModelViewSet should inherit `FiltersMixin` from

2. To apply filters using `drf-url-filters` we need to configure our view to
have a dict mapping `filter_mappings` which converts incoming query parameters
to query you want to make on the column name on the queryset.



from filters.schema import base_query_param_schema
from filters.validations import (

# make a validation schema for players filter query params
players_query_schema = base_query_param_schema.extend(
"id": IntegerLike(),
"name": unicode,
"team_id": CSVofIntegers(), # /?team_id=1,2,3
"install_ts": DatetimeWithTZ(),
"update_ts": DatetimeWithTZ(),



from rest_framework import (

from .models import Player, Team
from .pagination import ResultSetPagination
from .serializers import PlayerSerializer, TeamSerializer
from .validations import teams_query_schema, players_query_schema
from filters.mixins import (

class PlayersViewSet(FiltersMixin, viewsets.ModelViewSet):
This viewset automatically provides `list`, `create`, `retrieve`,
`update` and `destroy` actions.
serializer_class = PlayerSerializer
pagination_class = ResultSetPagination
filter_backends = (filters.OrderingFilter,)
ordering_fields = ('id', 'name', 'update_ts')
ordering = ('id',)

# add a mapping of query_params to db_columns(queries)
filter_mappings = {
'id': 'id',
'name': 'name__icontains',
'team_id': 'teams',
'install_ts': 'install_ts',
'update_ts': 'update_ts',
'update_ts__gte': 'update_ts__gte',
'update_ts__lte': 'update_ts__lte',

# add validation on filters
filter_validation_schema = players_query_schema

def get_queryset(self):
Optionally restricts the queryset by filtering against
query parameters in the URL.
query_params = self.request.query_params
url_params = self.kwargs

# get queryset_filters from FilterMixin
queryset_filters = self.get_db_filters(url_params, query_params)

# This dict will hold filter kwargs to pass in to Django ORM calls.
db_filters = queryset_filters['db_filters']

# This dict will hold exclude kwargs to pass in to Django ORM calls.
db_excludes = queryset_filters['db_excludes']

# fetch queryset from Players model
queryset = Player.objects.prefetch_related(
'teams' # use prefetch_related to minimize db hits.

return queryset.filter(**db_filters).exclude(**db_excludes)

With the use of `drf-url-filters` adding a new filter on a new column is as
simple as adding a new key in the dict. Prohibitting a filter on particular
column is same as removing a key value mapping from the `filter_mappings` dict.

Copyright (c) 2016 Manjit Kumar.

# Credits
Special thanks to authors of
[voluptouos]( and friends
[cdax]( and [saurabhjha](
who encourage people to contribute into open source community.

# Support
Please [open an issue]
( for support.

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