Add Object marshaller.

accountant/api/fields.py

@@ -0,0 +1,40 @@
+"""
+    This file is part of Accountant.
+
+    Accountant is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Accountant is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with Accountant.  If not, see <http://www.gnu.org/licenses/>.
+"""
+from flask.ext.restful import marshal, fields
+
+
+class Object(fields.Raw):
+    """
+    Field to marshal an object with fields.
+
+    SQLAlchemy rows are viewed as tuples by Restful marshaller, and must be
+    translated into a dict before marshaling.
+    """
+    def __init__(self, fields, **kwargs):
+        """
+        :param fields: field declaration.
+        """
+        self.fields = fields
+
+        super(Object, self).__init__(**kwargs)
+
+    def format(self, value):
+        # First transform object in dict with fields in attribute.
+        result = {key: getattr(value, key, None) for key in self.fields.keys()}
+
+        # Marshal the dict
+        return marshal(result, self.fields)