Question

I’ve just started learning ruby, so this question is simple.

I created @subject in controller.
Why is :subject used in form_for (instead of @subject)?

<%= form_for(:subject, :url => {:action => 'create'}) do |f| %>

Answer 1

It is similar to the assigns in rspec rails testing (you can look it up, assigns(:subject) will seek out for a @subject in your controller). Correct me if I am wrong but I think it is because the symbol :subject will try to seek out for an instance variable in your controller that correspond with @subject. So to prove it, rename your @subject in your controller to something else, like @subjectz and I think it won’t work anymroe