Ticket #26327: contrib_postgres_json_agg.patch

django/contrib/postgres/aggregates/general.py

@@ -1 +1 @@
 from django.db.models.aggregates import Aggregate
 
+import json
+
 __all__ = [
-    'ArrayAgg', 'BitAnd', 'BitOr', 'BoolAnd', 'BoolOr', 'StringAgg',
+    'ArrayAgg', 'BitAnd', 'BitOr', 'BoolAnd', 'BoolOr', 'JsonAgg', 'StringAgg',
 ]
 
 
@@ -30 +32 @@
     function = 'BOOL_OR'
 
 
+class JsonAgg(Aggregate):
+    function = 'JSON_AGG'
+
+    def convert_value(self, value, expression, connection, context):
+        if not value:
+            return []
+        return json.loads(value)
+
+
 class StringAgg(Aggregate):
     function = 'STRING_AGG'
     template = "%(function)s(%(expressions)s, '%(delimiter)s')"