![akshay (at mugasha) akshay (at mugasha)](/images/avatar-large.gif)
NoMethodError on first page (Multiple associations)
Reported by akshay (at mugasha) | October 25th, 2008 @ 04:12 AM
Hello, I have been trying to debug this issue and then i realized that plugin was causing this.
I am using the example of search from railscasts but I have a deep association model.
-----ERROR---------------------------------
NoMethodError in Browses#tracks
Showing app/views//tracks.html.erb where line #18 raised:
You have a nil object when you didn't expect it! The error occurred while evaluating nil.setTitle Extracted source (around line #18):
15: 16: <% for track in @track do %> 17:
=> 18: <%= track.trackTitle%> - <%= track.artist.name %> (<%= track.dj_set.setTitle %>) 19:
20: <% end %> 21:class Track belongs_to :dj_set belongs_to :artist end class dj_set has_many :tracks, :dependent => :destroy end class artist has_many :tracks end
------track.html.erb------ <% form_tag request.path, :method => 'get' do %> <% content_tag :label do %>
Search Tracks:
<%= text_field_tag :search, params[:search] %>
<% end %> <% end %>
<% for track in @track do %>
<h3 style="margin-bottom: 2px">
<%= track.trackTitle%> - <%= track.artist.name %> (<%= track.dj_set.setTitle %>)
</h3>
<% end %>
------ Track.rb model -------
def self.search(search, page)
paginate :per_page => 20, :page => page,
:include => [:artist, :dj_set],
:conditions => ['trackTitle like ?', "%#{search}%"], :order => 'created_at'
end
----- browse_controller.rb ------
def tracks
@track = Track.search(params[:search], params[:page])
end
This WORKS fine on page >2 and if any search is performed. The eror is only shown on page one.
Correct output
Search Tracks: --intro--- Intro - A State of Trance (374) Intro - A State of Trance (375) Intro - A State of Trance (373) Intro - Trance Around the World (239) Intro - Trance Around the World (238)
Thanks you! Cheers, Akshay
Comments and changes to this ticket
-
Mislav October 26th, 2008 @ 10:20 PM
How are you sure the plugin is causing this? From what I see from your code and error, the problem isn't in pagination at all, but in the fact that one of the Tracks doesn't have dj_set.
-
akshay (at mugasha) October 27th, 2008 @ 10:48 AM
You are totally right. I just checked the table and one track had a dj_set NULL. This is my fault and I apologize for blaming the plugin. Thanks for pointing that out and all your work on this awesome plugin. Cheers, Akshay
-
Mislav October 30th, 2008 @ 10:07 AM
- State changed from new to invalid
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