add bookmark collection editor

app/models.py

@@ -511,6 +511,12 @@ class BookmarkCollections(Model):
         """
         res = db.fetch_one(q, user_id)
 
+    @classmethod
+    def get_for_user(cls, user_id):
+        q = """SELECT * FROM bookmark_collections WHERE user_id = ? ORDER BY sort_order ASC"""
+        res = db.query(q, user_id)
+        return [cls.from_data(row) for row in res]
+
     def has_posts(self):
         q = 'SELECT EXISTS(SELECT 1 FROM bookmarked_posts WHERE collection_id = ?) as e'
         res = db.fetch_one(q, self.id)['e']