I am getting following error:
##################################################
NoMethodError in TopicsController#show
You have a nil object when you didn''t expect it!
The error occurred while evaluating nil.items
##################################################
####################
## Show Method in topics controller
####################
def show
@topic = @object
@items = @topic.items
end
####################
##Topic Model
####################
class Topic < ActiveRecord::Base
validates_presence_of :title, :section_id
validates_uniqueness_of :title
has_many :items
:order => :position,
:dependent => :destroy, #don''t leave orphans (delete my
children)
:conditions =>"parent_id is null" #
belongs_to :section
end
####################
##Item Model
####################
class Item < ActiveRecord::Base
validates_uniqueness_of :title, :scope => [:topic_id, :parent_id]
validates_presence_of :topic_id, :title, :owner, :position
belongs_to :topic
belongs_to :parent,
:class_name => "Item",
:foreign_key => "parent_id"
has_many :children,
:class_name => "Item",
:foreign_key => "parent_id",
:order => :position,
:dependent => :destroy #don''t leave orphans (cascade delete)
has_many :attachments,
:dependent => :destroy #don''t leave orphans (cascade delete)
def section
self.topic ? self.topic.section : nil
end
end
####################
In addition, I have Items controller and attachments controller. Right
now I am starting with first Topics controller only. My config/routes.rb
file contains:
map.resources :topics
. I would like to make this application RESTful.
Any ideas on how to proceed and resolve this error?
Thanks,
CS.
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def show @topic = Topic.find(params[:id]) @items = @topic.items end Try this method -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Thanks.. Well, I figured it out after I posted it on forum... While I know why passing parameter is working, I don''t understand why first approach didn''t work. Any clues? Priya Buvan wrote:> def show > @topic = Topic.find(params[:id]) > @items = @topic.items > end > Try this method-- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
You didn''t mention the id of the topic which you are trying to show.. Also where you have created @topic object? -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
your first aproach was this: def show @topic = @object @items = @topic.items end where would @object come from. it''s a new uninitialized variable (nil). that''s the reason it didn''t work. what else did you expect than nil.items ? --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---