dj22: do not backport jsonb key transforms (#51516)

zoo/zoo_data/lookups.py

@@ -14,59 +14,59 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from django.contrib.postgres.fields import jsonb
+import django
+
 from django.db.models import Transform, TextField, DateField
 
-from django.conf import settings
+from django.contrib.postgres.fields import jsonb
+try:
+    from django.contrib.postgres.fields.jsonb import KeyTransform, KeyTransformTextLookupMixin
+except ImportError:
+    # backport from Django 2.x
+    class KeyTransform(Transform):
+        operator = '->'
+        nested_operator = '#>'
 
+        def __init__(self, key_name, *args, **kwargs):
+            super(KeyTransform, self).__init__(*args, **kwargs)
+            self.key_name = key_name
 
-class KeyTransform(Transform):
-    operator = '->'
-    nested_operator = '#>'
+        def as_sql(self, compiler, connection):
+            key_transforms = [self.key_name]
+            previous = self.lhs
+            while isinstance(previous, KeyTransform):
+                key_transforms.insert(0, previous.key_name)
+                previous = previous.lhs
+            lhs, params = compiler.compile(previous)
+            if len(key_transforms) > 1:
+                return "(%s %s %%s)" % (lhs, self.nested_operator), [key_transforms] + params
+            try:
+                int(self.key_name)
+            except ValueError:
+                lookup = "'%s'" % self.key_name
+            else:
+                lookup = "%s" % self.key_name
+            return "(%s %s %s)" % (lhs, self.operator, lookup), params
 
-    def __init__(self, key_name, *args, **kwargs):
-        super(KeyTransform, self).__init__(*args, **kwargs)
-        self.key_name = key_name
+    jsonb.KeyTransform = KeyTransform
 
-    def as_sql(self, compiler, connection):
-        key_transforms = [self.key_name]
-        previous = self.lhs
-        while isinstance(previous, KeyTransform):
-            key_transforms.insert(0, previous.key_name)
-            previous = previous.lhs
-        lhs, params = compiler.compile(previous)
-        if len(key_transforms) > 1:
-            return "(%s %s %%s)" % (lhs, self.nested_operator), [key_transforms] + params
-        try:
-            int(self.key_name)
-        except ValueError:
-            lookup = "'%s'" % self.key_name
-        else:
-            lookup = "%s" % self.key_name
-        return "(%s %s %s)" % (lhs, self.operator, lookup), params
+    class KeyTextTransform(KeyTransform):
+        operator = '->>'
+        nested_operator = '#>>'
+        _output_field = TextField()
 
-
-jsonb.KeyTransform = KeyTransform
-
-
-class KeyTextTransform(KeyTransform):
-    operator = '->>'
-    nested_operator = '#>>'
-    _output_field = TextField()
-
-
-class KeyTransformTextLookupMixin(object):
-    """
-    Mixin for combining with a lookup expecting a text lhs from a JSONField
-    key lookup. Make use of the ->> operator instead of casting key values to
-    text and performing the lookup on the resulting representation.
-    """
-    def __init__(self, key_transform, *args, **kwargs):
-        assert isinstance(key_transform, KeyTransform)
-        key_text_transform = KeyTextTransform(
-            key_transform.key_name, *key_transform.source_expressions, **key_transform.extra
-        )
-        super(KeyTransformTextLookupMixin, self).__init__(key_text_transform, *args, **kwargs)
+    class KeyTransformTextLookupMixin(object):
+        """
+        Mixin for combining with a lookup expecting a text lhs from a JSONField
+        key lookup. Make use of the ->> operator instead of casting key values to
+        text and performing the lookup on the resulting representation.
+        """
+        def __init__(self, key_transform, *args, **kwargs):
+            assert isinstance(key_transform, KeyTransform)
+            key_text_transform = KeyTextTransform(
+                key_transform.key_name, *key_transform.source_expressions, **key_transform.extra
+            )
+            super(KeyTransformTextLookupMixin, self).__init__(key_text_transform, *args, **kwargs)
 
 
 class Lower(Transform):