def delete_goal(self, goal_id):
user_node = self.user_node
goal = Goal()
goal.id = goal_id
# have to remove all relationships before deleteing a node
goal.delete_all_interests()
goal_node = goal.goal_node
user_goal_rel = self._graph_db.match_one(start_node=user_node,
rel_type=GraphRelationship.HAS_GOAL,
end_node=goal_node)
self._graph_db.delete(user_goal_rel)
self._graph_db.delete(goal_node)
