在Rails`form_for` helper中向控制器发送附加表单数据

Question

If I have a User model and I use:

form_for @user, url: {controller: :user, action: :create} do |f|

I can add the fields I need by (for example) going:

<%= f.text_field :name %>

But on this particular admin page I am working on I want to send additional data back to my controller, data which is not part of the User model, ie

<%= f.text_field :some_info %>

This gives me a 'undefined method some_info` error.

Is there a way that I can get my form helper to allow me to set additional strings, to use as part of my controller logic?

Answer 1

We can have a method called attr_accessor in rails to define additional fields which are not in specified model.

Try like this:

Add below line in model.rb file

attr_accessor :some_info

and add this line to your form

<%= f.text_field :some_info %>

Answer 2

@gFontaniva was correct, instead of

<%= f.text_field :some_info %>

You exclude it from the form variable, and use the tag method, as:

<%= text_field :some_info, '' %>

This then can be accessed from the controller, outside the scope of the form model, so the first example accessed:

params[:user][:some_info]

And the second version:

params[:some_info]

Exactly as I needed.