First argument in form cannot contain nil or be empty Hartl's Rails 4 Tutorial

Question

I\'m working through Michael Hartl\'s Rails tutorial, and I\'m running into an issue in section 7.3.3. I receive this error message:

ArgumentError in Users#         


        

Answer 1

In your new.html.erb you have specified form_for(@user) that means you need to have some value in instance variable @user before calling the new action.

You can do it in two ways :

one way is define an action new in your controller which would be called before rendering your new.html.erb layout. For eg:

def new
  @user = User.new
end

other way is that in your form itself you could specify something like

<%= form_for(User.new) do |f| %>

Defining it in your new action is more standard way of doing it.