djangorestframework-chain 0.1.0

Chained relations and filtering for Django REST Framework

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

Installation

$ pip install djangorestframework-chain

Usage

Chaining filtering through relations

To enable chained filtering through relations:

views.py

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

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

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

# 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

Allowing any lookup type on a field

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:

views.py

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 RelatedField and AllLookupsFilter

We can combine RelatedField and AllLookupsFilter:

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

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

License

Copyright (c) 2013 Philip Neustrom <[e-mail]>

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:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.