django-rest-framework-chain is an extension to Django REST Framework that allows arbitrary chaining of both relations and lookup filters.

E.g. this allows you to do stuff like:

/api/page/?author__username__icontains=john
/api/page/?author__username__endswith=smith

Without having to create a zillion filter fields by hand.

$ pip install djangorestframework-chain

• Python 2.6+
• Django 1.4.5+

To enable chained filtering through relations:

from rest_framework import viewsets
import django_filters
from rest_framework_chain import ChainedFilterSet, RelatedFilter

# Just a regular FilterSet
class UserFilter(django_filters.FilterSet):
    username = django_filters.CharFilter(name='username')
    ...

class PageFilter(ChainedFilterSet):
    title = django_filters.CharFilter(name='title')
    author = RelatedFilter(UserFilter, name='author')
    ...

# Then just use the PageFilter as you would any other FilterSet:

class PageView(viewsets.ModelViewSet):
    ...
    filter_class = PageFilter

then we can automatically chain our filters through the author relation, as so:

/api/page/?author__username=philipn

We can use the AllLookupsFilter to allow all possible lookup types on a particular field. While we could otherwise specify these by hand, e.g.:

class ProductFilter(django_filters.FilterSet):
    min_price = django_filters.NumberFilter(name="price", lookup_type='gte')
    ...

to allow the price__gte lookup. But this gets cumbersome, and we sometimes want to allow any possible lookups on particular fields. We do this by using AllLookupsFilter:

from rest_framework import viewsets
import django_filters
from rest_framework_chain import ChainedFilterSet, AllLookupsFilter

class PageFilter(ChainedFilterSet):
    title = AllLookupsFilter(name='title')
    ...

then we can use any possible lookup on the title field, e.g.:

/api/page/?title__icontains=park

or :

/api/page/?title__startswith=The

and also filter on the default lookup (exact), as usual:

/api/page/?title=The%20Park

Combining RelatedFilter and AllLookupsFilter ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We can combine RelatedFilter and AllLookupsFilter:

from rest_framework import viewsets
import django_filters
from rest_framework_chain import ChainedFilterSet, RelatedFilter

class PageFilter(ChainedFilterSet):
    title = django_filters.CharFilter(name='title')
    author = RelatedFilter(UserFilter, name='author')

# Just a regular FilterSet
class UserFilter(ChainedFilterSet):
    username = AllLookupsFilter(name='username')
    ...

then we can filter like so:

/api/page/?author__username__icontains=john

Recursive relations are supported. You will need to specify the full module path in the RelatedFilter definition in some cases, e.g.:

class PersonFilter(ChainedFilterSet):
 name = AllLookupsFilter(name='name')
 best_friend = RelatedFilter('people.views.PersonFilter', name='best_friend')

 class Meta:
     model = Person 

Copyright (c) 2013 Philip Neustrom <philipn@gmail.com>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

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