NilClass in Partial

Rails
1

I appreciate your help in advance; I feel like the issue is staring me
in the face!

I have two models: event and topic

/models/event.rb:
class Event < ActiveRecord::Base
…
has_many :topics
…

/models/topic.rb:
class Topic < ActiveRecord::Base
belongs_to :event
end

I’m successfully showing the dependent topics with the event:
/views/events/show.html.erb:

…

<% end %>
<%= topic.Name %> <%= topic.Description %>
..

When I attempt to edit the record that I can successfully show, I get:

Showing /views/events/_topic.html.erb where line #2 raised:

undefined method `new_record?’ for nil:NilClass
Extracted source (around line #2):

1:


2: <% new_or_existing = topic.new_record? ? ‘new’: ‘existing’ %>
3: <% prefix = “event[#{new_or_existing}_topic_attributes][]”%>
4:
5: <% fields_for prefix, topic do |topic_form| -%>

The partial is rendered in edit.html.erb:

Editing tag

<%= render ‘form’ %>


<%= render ‘topic’, :collection => @event.topics %>

<%= link_to ‘Show’, @event %> |
<%= link_to ‘Back’, events_path %>

Ideas are appreciated!
Thanks,
Karl

2

On 21 April 2012 05:04, Karl McCollester [email protected] wrote:

The partial is rendered in edit.html.erb:

Editing tag

<%= render ‘form’ %>

<%= render 'topic', :collection => @event.topics %>

I have not used :collection to pass something like @event.topics
rather than a simple variable such as @topics, so wonder whether this
works as you expect. You could try
<%= render ‘topic’, :collection => @event.topics, :as => :topic %>
in order to force the variable name in the partial.

Colin