loadData(data) {
    for (let key in data) {
      this.createCollection(key, cloneDeep(data[key]));
    }
  }
Loads an object of data into Mirage's database.

    The keys of the object correspond to the DbCollections, and the values are arrays of records.

    ```js
    server.db.loadData({
      users: [
        { name: 'Yehuda' },
        { name: 'Tom' }
      ]
    });
    ```

    As with `db.collection.insert`, IDs will automatically be created for records that don't have them.

    @method loadData
    @param {Object} data - Data to load
    @public