Add ALL_LOOKUPS to filters

This is just a reference to django.db.models.sql.constants.QUERY_TERMS,
which is a list of all valid lookups.

Author: Ryan P Kilby

README.rst

@@ -127,6 +127,21 @@ and also filter on the default lookup (``exact``), as usual::
 
     /api/page/?title=The%20Park
 
+Additionally, you may use ``ALL_LOOKUPS`` with dictionary style declarations.
+
+.. code-block:: python
+
+    import rest_framework_filters as filters
+
+    class PageFilter(filters.FilterSet):
+        ...
+
+        class Meta:
+            fields = {
+                'title': filters.ALL_LOOKUPS,
+            }
+
+
 Combining RelatedFilter and AllLookupsFilter
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

rest_framework_filters/filters.py

@@ -6,9 +6,12 @@
 
 import django
 from django_filters.filters import *
+from django_filters.filters import LOOKUP_TYPES
 
 from . import fields
 
+ALL_LOOKUPS = LOOKUP_TYPES
+
 
 def _import_class(path):
     module_path, class_name = path.rsplit('.', 1)