Question

I feel like I’m doing something dumb here. I’m making a simple TODO list app (I realize there are already a million of them). I have a project definition and the various statuses that a task within in that project can be assigned.

No matter what, I’m receiving the following error message when hitting the page:

undefined method `title’ for nil:NilClass

This question about nil objects is extremely similar, however, the suggested solutions don’t seem to fix the issue I’m encountering. I only have one status associated with the project and it is not nil. I’m wondering if this issue has anything to do with the statuses being an association…

In my project I have:

    <% @project.statuses.each do |s| %> 
      <%= s.inspect %> 
      <%= render 'statuses/show', :status => s %>
   <% end %>

#if I take out the render line - the status shows up 

The status right now is basically just a generic scaffolded view — if I was passing the data from a controller directly it would receive an object @status.
…
I have tried this with render :partial..., :locals => { :status = s} etc. etc. Any suggestions would be appreciated.

Update – Added _show Partial:

<p id="notice"><%= notice %></p>

<p>
  <b>Title:</b>
  <%= @status.title %>
</p>

<p>
  <b>Description:</b>
  <%= @status.description %>
</p>

<p>
  <b>Active:</b>
  <%= @status.active %>
</p>

<%= link_to 'Edit', edit_status_path(@status) %> |
<%= link_to 'Back', statuses_path %>

Update – Added more of the error message

NoMethodError in Projects#show

Showing /home/.../app/views/statuses/_show.html.erb where line #5 raised:

undefined method `title' for nil:NilClass

Answer 1

I believe the problem is that you’re referring to @status in the ERB partial, where as you should be referring to status, without the leading @.

The @status means to look for a defined instance variable. While passing in the :status => s means that the view will have access to s via a local variable named status.

Also, if simply :status => s does not work, try :locals => {:status => s}. In any case, access status in the view, not @status.