Can''t get the following to work: class Forum < ActiveRecord::Base has_many :topics has_many :recent_posts, :through => :topics, :source => :last_post, :order => ''posted_at DESC'' end class Topic < ActiveRecord::Base has_one :last_post, :class_name => ''Post'', :order => ''posted_at DESC'' end class Post < ActiveRecord::Base belongs_to :topic end Forum.find(:first).offers I get the following error: ActiveRecord::HasManyThroughSourceAssociationMacroError: ActiveRecord::HasManyThroughSourceAssociationMacroError from c:/InstantRails-1.0/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/reflection.rb:181:in `check_validity!'' from c:/InstantRails-1.0/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/associations/has_many_through_association.rb:6:in `initialize'' from c:/InstantRails-1.0/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/associations.rb:876:in `offers'' from (irb):93 Any clues? Cheers, ~ Mark Dodwell -- 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 -~----------~----~----~----~------~----~------~--~---
> Forum.find(:first).offersSorry I meant: Forum.find(:first).recent_posts -- 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 -~----------~----~----~----~------~----~------~--~---
I would suggest fully qualifying the :order fields as one thing to try. I do not see anything obvious that is wrong with the models. Can you post the migrations as well? It may be a miss-match between the models and the tables. Michael On Mar 17, 8:24 am, Mark Dodwell <rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> > Forum.find(:first).offers > > Sorry I meant: > > Forum.find(:first).recent_posts > > -- > Posted viahttp://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 -~----------~----~----~----~------~----~------~--~---
It seems the has_one assoc. on the Topic model is why this doesn''t work. It returns a single item as opposed to an array containing a single item. I ended up doing this: class Forum < ActiveRecord::Base class Forum < ActiveRecord::Base has_many :topics has_many :recent_topics, :class_name => ''Topic'', :finder_sql => ''SELECT DISTINCT topics.* FROM ('' + ''SELECT topics.* '' + ''FROM forums '' + ''INNER JOIN topics ON forums.id = topics.forum_id '' + ''INNER JOIN posts ON topics.id = posts.topic_id '' + ''WHERE forums.id = #{id} '' + ''ORDER BY posts.posted_at DESC'' + '') AS topics'' has_many :recent_posts, :through => :topics, :source => :last_post, :order => ''posted_at DESC'' end class Topic < ActiveRecord::Base has_many :last_post, :class_name => ''Post'', :order => ''posted_at DESC'', :limit => 1 end class Post < ActiveRecord::Base belongs_to :topic end As you can see it''s not very pretty. In addition I had to do some pretty crazy custom finder_sql to add the ''recent_topics'' assoc. After several hours I gave up trying to find a DRY solution. Any improvements welcomed! -- 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 -~----------~----~----~----~------~----~------~--~---