[Rails] Re: Cannot access an object’s attributes in an array

I see I have used the wrong variable name here... Instead of
similar_works, use logger.info same_credits.inspect

Sorry about that.  Your code snippet had quite a few
similar_variable_names.  :P

On Jul 31, 3:20 pm, Zach Karpinski <zkarpin...@xxxxxxxxx> wrote:
> Can you give us a bit more info about what "credit.title.credits"
> looks like?  It looks like it should be an array of objects.  Put a
> logger.info similar_works.inspect and look at your development.log to
> see what it says about the values it ends up with.
>
> If it isn't an array or if it is an empty array you will just end up
> doing nothing and that function just exits without accomplishing much.
>
> On Jul 31, 11:35 am, fahrio <fah...@xxxxxxxxx> wrote:
>
>
>
> > Hello,
>
> > I am building a site with works and their credits. What I am trying o
> > achieve is to find each work's similar works based on the mutual
> > titles in their credits.
>
> > I am adding each similar work into an array in a for loop and when I
> > try to access the attributes of these works I get a "nil object when
> > you didn't expect it!" error. I can see the Work objects when I debug
> > in the array, but can't access to their attributes. Here is the code:
>
> > class Work < ActiveRecord::Base
>
> >   def similar_works
> >     @similar_works
> >   end
>
> >   def find_similar_works
> >     @similar_works = []
> >     for credit in self.credits
> >       same_credits = credit.title.credits #same credits with mutual
> > titles
> >       for credit2 in same_credits
> >         @similar_works << credit2.work
> >         end
> >     end
> >   end
>
> > end
>
> > class WorksController < ApplicationController
>
> >   def index
> >     list
> >     render(:action => 'list')
> >   end
>
> >   def list
> >     # find similar works for each work
> >     @works.each do |work|
> >       work.find_similar_works
> >     end
> >   end
>
> > end
>
> > list.html
>
> > <% for work in @works -%>
> > <% for similarwork in work.similar_works%>
> >     <%= similarwork.name%> => nil object
> >     <%=debug(similarwork)%> => sample debug output is below
> > <% end %>
> > <% end %>
>
> > --- !ruby/object:Work
> > attributes:
> >   name: Borozan
> >   updated_at: 2009-07-31 12:30:30
> >   created_at: 2009-07-31 12:25:32
> > attributes_cache: {}
>
> > --- !ruby/object:Work
> > attributes:
> >   name: Boom
> >   updated_at: 2009-07-31 12:30:30
> >   created_at: 2009-07-31 12:25:32
> > attributes_cache: {}
>
> > --- !ruby/object:Work
> > attributes:
> >   name: Kamuflaj
> >   updated_at: 2009-07-31 12:30:30
> >   created_at: 2009-07-31 12:25:32
> > attributes_cache: {}
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