Fixed #22907 -- Array contains must have same type.

django/contrib/postgres/fields/array.py

@@ -159,7 +159,8 @@ class ArrayContainsLookup(Lookup):
         lhs, lhs_params = self.process_lhs(qn, connection)
         rhs, rhs_params = self.process_rhs(qn, connection)
         params = lhs_params + rhs_params
-        return '%s @> %s' % (lhs, rhs), params
+        type_cast = self.lhs.source.db_type(connection)
+        return '%s @> %s::%s' % (lhs, rhs, type_cast), params
 
 
 ArrayField.register_lookup(ArrayContainsLookup)

tests/postgres_tests/test_array.py

@@ -118,6 +118,13 @@ class TestQuerying(TestCase):
             self.objs[1:3]
         )
 
+    def test_contains_charfield(self):
+        # Regression for #22907
+        self.assertSequenceEqual(
+            CharArrayModel.objects.filter(field__contains=['text']),
+            []
+        )
+
     def test_index(self):
         self.assertSequenceEqual(
             NullableIntegerArrayModel.objects.filter(field__0=2),