Yii2 - 从dropDownList中删除项目

Question

In my ticket form I have a dropDownList for the employees, and in the employees model I have employee_status which is 'Available', 'Not Available'

If I change the status of the employee to 'Not Available' how am I going to remove it automatically from the dropDownList in Ticket form?

The Employee Dropdown from Ticket

<?= $form->field($model, 'employee_id')->dropDownlist(
                 ArrayHelper::map(Employee::find()->all(), 'id', 'employee_name'),
                 [
                  'prompt' => 'Select Employee ID',
                  'style' => 'width:200px'
          ]); ?>

Answer 1

I finally get it

<?= $form->field($model, 'employee_id')->dropDownlist(
                       ArrayHelper::map(Employee::find()->where(['status' => 'Available'])->all(), 'id', 'employee_name'),
                       [
                        'prompt' => 'Select Employee ID',
                        'style' => 'width:200px'
                      ]); ?>