Fix location relationship

warehouse/models.py

@@ -67,7 +67,7 @@ class Location(db.Model):
 	name = db.Column(db.String(128), nullable=False)
 	description = db.Column(db.Text(), nullable=False, server_default='')
 	parent_id = db.Column(db.String(5), db.ForeignKey('location.id'))
-	parent = db.relationship('Location')
+	children = db.relationship('Location', backref=db.backref('parent', remote_side=[id]))
 
 item_photo = db.Table('item_photo',
 	db.Column('item_id', db.String(5), db.ForeignKey('item.id', onupdate='CASCADE', ondelete='CASCADE'), primary_key=True),