How to display a form in one controller, action and view, and send data to another?

Question

Yii

Good evening, please tell me how to make a form in one controller and action, and send the data to another?
I have a "Book" model, a "BookController" controller and an "actionView" method that renders a "view" view and I need to make a form in it via an ActivForm.
Output 1 field ("animal_id") that belongs to the "Lead" model. And you need to pass the value that falls into "animal_id" to "actionCreate".
I do like this:

<?php $form = ActiveForm::begin([
    'method' => 'get',
    'action' => ['lead/create'],
]); ?>
<?= $form->field($model, 'animal_id',['options' => ['class' => 'col-xs-6']]);
?>
<?= Html::submitButton('Ок', ['class' => 'btn btn-success']) ?>
<?php ActiveForm::end(); ?>

But an error is thrown: Call to a member function isAttributeRequired() on null
Tell me how to be and what to do? Thank you very much in advance

Answer 1

If I understand correctly, you want to link two different models in one form, look here

Answer 2

But an error is thrown: Call to a member function isAttributeRequired() on null

And in $modelyou it is casual not nullat a stage of an output of the form?