How to submit a form from a custom action to ActiveAdmin?

Question

Ruby on Rails

Created two actions - first (get) and second (post).
I placed the "active_admin_form_for" form in the first template. The form is displayed. The field names are wrapped in first (for example: first[title]).
After clicking on the "submit" button, we get into the "second" action, in the body of which there is only one line: In the received JSON, we have nothing. That is, there are default form values, such as: "authenticity_token" or "controller" with "action", but no more. There are no fields. Why aren't there? The fields are non-standard. They are not in the table in the database. I just need to get the value from them in the "second" action for further manipulation (not for writing to the db).
render json: params

Answer 1

Check that the attributes are specified in permit_params and, in general, it should be visible in the logs that the necessary attributes are present in the parameters during the POST action.