added toJSON func

models/user_model.py

@@ -2,6 +2,8 @@
 """
 Example user model and related models
 """
+import json
+
 from sqlalchemy.orm import relation
 from sqlalchemy import MetaData
 
@@ -347,7 +349,12 @@ class User(UserMixin, db.Model):
             followers.c.follower_id == self.id).order_by(Post.timestamp.desc())
 
     def to_dict(self):
-        return dict(id=self.id, email=self.email, groups=self.groups)
+        #return self.__dict__
+        return dict(id=self.id, email=self.email, groups=[g.to_dict() for g in self.groups])
+
+    def toJSON(self):
+        return json.dumps(self.to_dict(), default=lambda o: o.__dict__,
+                          sort_keys=True, indent=4)
 
     def __repr__(self):
         return '<User %r>' % self.nickname
@@ -403,3 +410,10 @@ class Group(db.Model):
 
     def __str__(self):
         return self.name
+
+    def to_dict(self):
+        return dict(id=self.id, name=self.name)
+
+    def toJSON(self):
+        return json.dumps(self.to_dict(), default=lambda o: o.__dict__,
+                          sort_keys=True, indent=4)