--- a/group.py
+++ b/group.py
@@ -18,11 +18,9 @@
     created_by = db.Column(db.Integer, db.ForeignKey('users.id'))
 
     creator = db.relationship('User', backref='groups', lazy='dynamic')
-    memberships = db.relationship('Membership', backref='groups', lazy='dynamic')
 
     def __init__(self, name):
         self.name = name
-
 
 
     def persist(self):        # add record
--- a/membership.py
+++ b/membership.py
@@ -14,6 +14,9 @@
     gid = db.Column(db.Integer, db.ForeignKey('groups.id'))
     created = db.Column(db.DateTime, default=datetime.utcnow)
 
+    user = db.relationship('User', backref='memberships', lazy='dynamic')
+    group = db.relationship('Group', backref='memberships', lazy='dynamic')
+
     def __init__(self, uid, gid):
         self.uid = uid
         self.gid = gid
--- a/user.py
+++ b/user.py
@@ -14,7 +14,6 @@
     id = db.Column(db.Integer, primary_key=True)
     username = db.Column(db.String(80))
     email = db.Column(db.String(120), unique=True)
-    memberships = db.relationship('Membership', backref='user', lazy='dynamic')
     created = db.Column(db.DateTime, default=datetime.utcnow)
     last_active = db.Column(db.DateTime, default=datetime.utcnow)
 


@@ -35,17 +34,14 @@
     def getByName(username):      #Query record by username
         tofind = User.query.filter_by(username=username).first()
         return tofind
-    
-    
+
     def persist(self):        #To create record
         db.session.add(self)
         db.session.commit()
 
-    
     def delete(self):            # To delete a record
         db.session.delete(self)
         db.session.commit()
-
 
 
     def __repr__(self):