- make the json serializer and deserializer per-dialect, so that we are

compatible with psycopg2's per-connection/cursor approach.  add round trip tests for
both native and non-native.

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/sqlalchemy/dialects/postgresql/base.py b/lib/sqlalchemy/dialects/postgresql/base.py
index a7f838009..3edc28fed 100644
--- a/lib/sqlalchemy/dialects/postgresql/base.py
+++ b/lib/sqlalchemy/dialects/postgresql/base.py
@@ -1439,9 +1439,12 @@ class PGDialect(default.DefaultDialect):
 
     _backslash_escapes = True
 
-    def __init__(self, isolation_level=None, **kwargs):
+    def __init__(self, isolation_level=None, json_serializer=None,
+                    json_deserializer=None, **kwargs):
         default.DefaultDialect.__init__(self, **kwargs)
         self.isolation_level = isolation_level
+        self._json_deserializer = json_deserializer
+        self._json_serializer = json_serializer
 
     def initialize(self, connection):
         super(PGDialect, self).initialize(connection)