refactor createMenuTree (#44)

* refactor createmenutree

* Update src/routes/middlewares/pages.js

Co-Authored-By: khaydarov <murod.haydarov@inbox.ru>

* push migration

* update

* remove migration and order is optional

* eslint fixes

src/models/pageOrder.js

@@ -34,6 +34,18 @@ class PageOrder {
     return new PageOrder(data);
   }
 
+  /**
+   * Find all pages which match passed query object
+   *
+   * @param {Object} query
+   * @returns {Promise<Page[]>}
+   */
+  static async getAll(query = {}) {
+    const docs = await db.find(query);
+
+    return Promise.all(docs.map(doc => new PageOrder(doc)));
+  }
+
   /**
    * @constructor
    *
@@ -154,6 +166,13 @@ class PageOrder {
     return this.order[currentPageInOrder + 1];
   }
 
+  /**
+   * @param {string[]} order - define new order
+   */
+  set order(order) {
+    this._order = order;
+  }
+
   /**
    * Returns ordered list
    *