code: function fill(form_id, data) {
          this._checkInit(form_id);
          for (var input_name in data) {
              if (this._collection[form_id].has(input_name)) {
                  this.set(form_id, input_name, data[input_name]);
              }
          }
      }
docs: Fill form data with object values. Object property name/value => form input name/value
  @param form_id
  @param data