Fixed slight mistake in adding achievements

user.py

@@ -12,12 +12,12 @@ def add_achievement(id):
     name = request.args.get("name")
     if not name:
         return "No name supplied"
-    a = Achievement(name=name, achieved_by=current_user.id)
-    db.session.add(a)
+    achievement = Achievement(name=name, achieved_by=id)
+    achievement.endorsed_by.append(current_user)
+    db.session.add(achievement)
     db.session.commit()
     return "OK"
 
-
 @app.route("/users/<id>")
 def get_user(id):
     user = User.query.filter_by(id=id).first()