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: {}
