How to start and stop editing a record?

Ext.define('Ext.form.Basic', {

  ...

  updateRecord: function(record) {

      var fields = record.fields,

          values = this.getFieldValues(),

          name,

          obj = {};

      fields.each(function(f) {

          name = f.name;

          if (name in values) {

              obj[name] = values[name];

          }

      });

      record.beginEdit();

      record.set(obj);

      record.endEdit();

      return this;

  },

  ...

});