Fix JSON serialization

Author: se3000

embedly/models.py

@@ -22,3 +22,9 @@ def __str__(self):
 
     def __unicode__(self):
         return '<%s %s>' % (self.method.title(), self.original_url or "")
+
+    def __getitem__(self, key):
+      if (key in self.data) and (self.data[key] == None):
+        return ''
+      else:
+        return self.data[key]

embedly/tests.py

@@ -61,7 +61,13 @@ def test_model(self):
         self.assertEqual(obj['new_key'], 'dict value')
 
     def test_model_data_can_serialize(self):
-        obj = Url({'a': {'key': 'value'}})
+        obj = Url({'hash': {'key': 'value'},
+                   'none': None,
+                   'empty': '',
+                   'float': 1.234,
+                   'int': 1,
+                   'string': 'string',
+                   'array': [0, -1]})
         unserialzed = json.loads(json.dumps(obj.data))
         self.assertDictEqual(obj.data, unserialzed)