Added str() for the Json adapter

Fixes ticket #191.

NEWS

@@ -1,6 +1,15 @@
 Current release
 ---------------
 
+What's new in psycopg 2.6
+-------------------------
+
+Bug fixes:
+
+- Json apapter's `!str()` returns the adapted content instead of the `!repr()`
+  (:ticket:`#191`).
+
+
 What's new in psycopg 2.5.3
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 

lib/_json.py

@@ -92,6 +92,14 @@ class Json(object):
         s = self.dumps(self.adapted)
         return QuotedString(s).getquoted()
 
+    if sys.version_info < (3,):
+        def __str__(self):
+            return self.getquoted()
+    else:
+        def __str__(self):
+            # getquoted is binary in Py3
+            return self.getquoted().decode('ascii', errors='replace')
+
 
 def register_json(conn_or_curs=None, globally=False, loads=None,
         oid=None, array_oid=None):

tests/test_types_extras.py

@@ -1055,6 +1055,17 @@ class JsonTestCase(ConnectingTestCase):
         self.assertEqual(data['a'], 100)
         self.assertEqual(data['b'], None)
 
+    @skip_if_no_json_module
+    def test_str(self):
+        snowman = u"\u2603"
+        obj = {'a': [1, 2, snowman]}
+        j = psycopg2.extensions.adapt(psycopg2.extras.Json(obj))
+        s = str(j)
+        self.assert_(isinstance(s, str))
+        # no pesky b's
+        self.assert_(s.startswith("'"))
+        self.assert_(s.endswith("'"))
+
 
 class RangeTestCase(unittest.TestCase):
     def test_noparam(self):