Question

I have a rails app whereby you can edit your account information. When I click the edit my information button i receive the following error when I click the link.

NoMethodError in Users#edit – undefined method `name’ for
nil:NilClass

Which is pointing to the following line of my users/_form.html.erb

<% else %> <td><%= @user.admin_level.name %>

My full trace follows: Pastie

It appears something is wrong with user.admin_level.name What I cannot seem to understand is why this error is occurring also the attribute name exist in the admin_level entity.

My users_controller has the following def edit:

 # GET /users/:id/edit
  def edit
    if @user
      respond_to do |format|
        format.html # edit.html.erb
      end
    else
    redirect_to routing_error_path
    end
  end

Its seems that I am missing something, do I need to define the name in my users_controller?

Answer 1

It simply means that <%= @user.admin_level %> is nil. This is maybe because the user has no admin_level assigned. Therefore, calling .name on nil which results in a noMethodError.

Correct would be <%= @user.admin_level.name if @user.admin_level %>, or maybe <%= @user.admin_level.try(:name) %> (which both only display something if admin_level is not nil)