remove custom json serializer

api/helpers/__init__.py

@@ -1 +0,0 @@
-from .json import JSONEncoder, JsonSerializer

api/helpers/json.py

@@ -1,46 +0,0 @@
-from flask.json import JSONEncoder as BaseJSONEncoder
-
-
-class JSONEncoder(BaseJSONEncoder):
-    """Custom :class:`JSONEncoder` which respects objects that include the
-    :class:`JsonSerializer` mixin.
-    """
-    def default(self, obj):
-        if isinstance(obj, JsonSerializer):
-            return obj.to_json()
-        return super(JSONEncoder, self).default(obj)
-
-
-class JsonSerializer(object):
-    """A mixin that can be used to mark a SQLAlchemy model class which
-    implements a :func:`to_json` method. The :func:`to_json` method is used
-    in conjuction with the custom :class:`JSONEncoder` class. By default this
-    mixin will assume all properties of the SQLAlchemy model are to be visible
-    in the JSON output. Extend this class to customize which properties are
-    public, hidden or modified before being being passed to the JSON serializer.
-    """
-
-    __json_public__ = None
-    __json_hidden__ = None
-    __json_modifiers__ = None
-
-    def get_field_names(self):
-        for p in self.__mapper__.iterate_properties:
-            yield p.key
-
-    def to_json(self):
-        field_names = self.get_field_names()
-
-        public = self.__json_public__ or field_names
-        hidden = self.__json_hidden__ or []
-        modifiers = self.__json_modifiers__ or dict()
-
-        rv = dict()
-        for key in public:
-            rv[key] = getattr(self, key)
-        for key, modifier in modifiers.items():
-            value = getattr(self, key)
-            rv[key] = modifier(value, self)
-        for key in hidden:
-            rv.pop(key, None)
-        return rv