How to set model attribute value to variable in controller without form in view?

Question

Yii

There are several forms on the view, the values ​​of which are passed to the model attributes (scenario[add]).
It is necessary to set the value of one of the attributes (country_id) equal to a variable, that is, do not create a form for it, but simply hard-link it to the same value for all additions of records to the database.
I'm new to Yii2, please be more detailed... Thank you.

Answer 1

The value of an attribute missing in the form can be set, for example, using the DefaultValidator

Answer 2

$model->someProperty = 'myValue';