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...=> ''name must be unique'' validates_presence_of :description, :on => :create, :message => "can''t be blank" has_one :attachment, :as => :attachable, :dependent => :destroy has_one :logo, :through => :attachment, :source => :attachable, :source_type => ''Maker'', :dependent => :destroy, :conditions => [''attachments.content_type = ?'', ''image/jpeg'' ] has_many :products def deletable? self.products.empty? end end What I would like to accomplish is to...

...y logic ran along the lines of an ifelse statement and then remove after that, but it doesn't seem to work? Any help appreciated Let's call the data test test$lag <- ifelse(test$user_id==lag(test$user_id) & test$timestamp==lag(test$timestamp),1,0) Can anyone help on this? Mike Source_type timestamp user_id 75381 0 07-07-2008-21:03:55 848307909687 75379 1 07-07-2008-19:52:55 848307838407 75380 2 07-07-2008-19:54:14 848307838407 75378 1 07-07-2008-15:24:01 848285633277 75374 1 07-07-2008-13:39:17 848273633667 75377...

...#39;'d rather not have to go to another controller/form just to create and edit page categories. class Page < ActiveRecord::Base has_many :category_items, :as => :item, :dependent => :destroy has_many :page_categories, :through => :category_items, :source => :category, :source_type => "PageCategory", :uniq => true accepts_nested_attributes_for :page_categories, :allow_destroy => true, :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } } end class PageCategory < ActiveRecord::Base has_many :pages, :through => :category_items, :source =&g...

...model class Computer create table computers ( id serial, description varchar ); -- model Class user create table users ( id serial, name varchar ); -- model class Desk create table desks ( id serial, location varchar ); -- The linking table create table linkings ( source_id int, source_type varchar, link_id int, link_type varchar, created_at timestamp, comments varchar ) I want to use has_many / belongs_to or some other association to be able to have any number of objects from different types linked to each object. I don''t want to create multiple linkings tables for...

...ired by init.rb of the plugin): http://github.com/dedomenon/madb_notifications/blob/master/lib/madb_notifications_lib.rb#L8 Entity.class_eval do def user_subscribed_to_creation?(user_id) NotificationSubscription.find(:first, :conditions => [ "source_filter = ? AND event = ? and source_type = ? and destination_type = ? and destination = ?", {:entity_id => self.id}.to_yaml , "after_create", "Instance", "user", user_id.to_s ]) end end and this is then used in a view of the plugin, where @entity is an instance of the model Entity: http://gith...

Hello, I encouter a problem when i try to do "rake db:migrate": rake aborted! can''t convert Hash into String Here is the trace result: ** Invoke db:migrate (first_time) ** Invoke environment (first_time) ** Execute environment rake aborted! can''t convert Hash into String /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/fileutils.rb:1408:in

http://stackoverflow.com/questions/2224994/why-are-double-sided-polymorphic-relationships-lacking-in-rails -- 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-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to