Merge pull request #112 from uncovertruth/feature/support_related

Support related complement lookups

HISTORY.rst

@@ -2,6 +2,11 @@
 History
 =======
 
+0.2.1
+-----
+
+- Support related `complement` lookups
+
 0.2.0
 -----
 

lookup_extensions/__init__.py

@@ -2,6 +2,6 @@
 
 __author__ = """UNCOVER TRUTH Inc."""
 __email__ = '[email protected]'
-__version__ = '0.2.0'
+__version__ = '0.2.1'
 
 default_app_config = 'lookup_extensions.apps.LookupExtensionsConfig'

lookup_extensions/backends/base/operations.py

@@ -1,5 +1,8 @@
 # Load lookup types
-from lookup_extensions import lookups  # noqa F401
+from lookup_extensions import (  # noqa F401
+    lookups,
+    related_lookups,
+)
 
 
 class ExtendedDatabaseOperationsMixin(object):

lookup_extensions/lookups/__init__.py

@@ -1,3 +1,3 @@
-from .exists import *  # noqa F401,F403
+from .complements import *  # noqa F401,F403
 from .exregex import *  # noqa F401,F403
 from .negate import *  # noqa F401,F403

lookup_extensions/related_lookups/__init__.py

@@ -0,0 +1 @@
+from .complements import *  # noqa F401,F403

lookup_extensions/related_lookups/complements.py

@@ -0,0 +1,11 @@
+from django.db.models.fields.related import ForeignObject
+from django.db.models.fields.related_lookups import RelatedLookupMixin
+
+from lookup_extensions.lookups import Complement
+
+
+class RelatedComplement(RelatedLookupMixin, Complement):
+    pass
+
+
+ForeignObject.register_lookup(RelatedComplement)

tests/test_lookup/tests.py

@@ -16,6 +16,7 @@
 try:
     from lookup.models import (
         Article,
+        Author,
         Game,
         Player,
         Season,
@@ -1187,3 +1188,21 @@ def test_negate_complement(self):
                 '<Article: Article 1>',
             ],
         )
+
+    def test_related_complement(self):
+        tags = Tag.objects.filter(articles__author=OuterRef('id'), name='Tag 2')
+        self.assertEqual(
+            [a.name for a in Author.objects.filter(
+                article__headline__startswith='Article',
+                article__tag__complement=Exists(tags)).distinct()],
+            ['Author 1', 'Author 2'],
+        )
+
+    def test_negate_related_complement(self):
+        tags = Tag.objects.filter(articles__author=OuterRef('id'), name='Tag 2')
+        self.assertEqual(
+            [a.name for a in Author.objects.filter(
+                article__headline__startswith='Article',
+                article__tag__complement=~Exists(tags)).distinct()],
+            [],
+        )