Reduced code duplication in ArrayField's lookups.

1 files changed, 15 insertions, 20 deletions

diff --git a/django/contrib/postgres/fields/array.py b/django/contrib/postgres/fields/array.py
index f85a280b61..73944056d5 100644
--- a/django/contrib/postgres/fields/array.py
+++ b/django/contrib/postgres/fields/array.py
@@ -190,36 +190,31 @@ class ArrayField(CheckFieldDefaultMixin, Field):
         })
 
 
+class ArrayCastRHSMixin:
+    def process_rhs(self, compiler, connection):
+        rhs, rhs_params = super().process_rhs(compiler, connection)
+        cast_type = self.lhs.output_field.db_type(connection)
+        return '%s::%s' % (rhs, cast_type), rhs_params
+
+
 @ArrayField.register_lookup
-class ArrayContains(lookups.DataContains):
-    def as_sql(self, qn, connection):
-        sql, params = super().as_sql(qn, connection)
-        sql = '%s::%s' % (sql, self.lhs.output_field.db_type(connection))
-        return sql, params
+class ArrayContains(ArrayCastRHSMixin, lookups.DataContains):
+    pass
 
 
 @ArrayField.register_lookup
-class ArrayContainedBy(lookups.ContainedBy):
-    def as_sql(self, qn, connection):
-        sql, params = super().as_sql(qn, connection)
-        sql = '%s::%s' % (sql, self.lhs.output_field.db_type(connection))
-        return sql, params
+class ArrayContainedBy(ArrayCastRHSMixin, lookups.ContainedBy):
+    pass
 
 
 @ArrayField.register_lookup
-class ArrayExact(Exact):
-    def as_sql(self, qn, connection):
-        sql, params = super().as_sql(qn, connection)
-        sql = '%s::%s' % (sql, self.lhs.output_field.db_type(connection))
-        return sql, params
+class ArrayExact(ArrayCastRHSMixin, Exact):
+    pass
 
 
 @ArrayField.register_lookup
-class ArrayOverlap(lookups.Overlap):
-    def as_sql(self, qn, connection):
-        sql, params = super().as_sql(qn, connection)
-        sql = '%s::%s' % (sql, self.lhs.output_field.db_type(connection))
-        return sql, params
+class ArrayOverlap(ArrayCastRHSMixin, lookups.Overlap):
+    pass
 
 
 @ArrayField.register_lookup