similar to: Callbacks on has_many relation

As per http://rails.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html Possible callbacks are: before_add, after_add, before_remove and after_remove. Should any of the before_add callbacks throw an exception, the object does not get added to the collection. Same with the before_remove callbacks; if an exception is thrown the object doesn‘t get removed. However, when the add

Hi, First post, please be gentle! I couldn''t find any mention of this already I''m using ActiveRecord and I want to enforce mutual exclusivity on a has_and_belongs_to_many. A concrete example: I have a User which can have one or more Roles (student, tutor, headmaster, administrator etc). However if a user is a student they cannot hold any other role. I was hoping to find

Can someone tell me what I''m doing wrong? I''ve spent way too much time on this -------------------------------------------------------------------------------------- class Picture < ActiveRecord::Base has_many :ratings, :after_add => :increment_rating, :after_remove => :decrement_rating def increment_members(rating) self.rating += rating.amount save!

Hi all I want to overwrite the push method (which is an alias of <<, the same as concat) of collections, and there I want to test if :uniq is set to true in the relationship. If so, the method should check if the passed object is already related to the parent, or not (only then it will be added). But I just can''t find the original code of this method, so I could overwrite

Hey guys, im trying to get my friends to come up at the top of the act as ferret search. I would query the whole result set first, then move my friends to the top, but the thing is, Im paginating my results and use the offset and limit parameters in the multi_search() function. Anyone know how to do this? Thanks in advance... -- Posted via http://www.ruby-forum.com/.

Hello world... I have an interesting issue that the online docs aren''t helping me with. In my app I have 4 models Item < ActiveRecord Deal < Item Product < Item Category < ActiveRecord Item has_and_belongs_to_many :categories... On each category record I''d like to maintain a product_count and deal_count to increase performance. This doesn''t appear

Hello! I have 2 table: users and buddies User: id, name, ... Buddy: id, user_id, user_buddy_id, ... So if you have 2 users 1,jack and 2,fred and fred is a buddy of jack, there is a Buddy object: id=1, user_id=1, user_buddy_id=2 I can declare only one belongs_to in Buddy and one has_many in User. And there is conflict if I had the second one (the first one is discarded) class User has_many

Hi all I got the following class: class Member < ActiveRecord::Base has_and_belongs_to_many :buddies, :class_name => ''Member'', :join_table => ''members_have_buddies'', :foreign_key => ''member_id'', :association_foreign_key =>

Hi, Following problem: We have a tree structure with children and a root element (recursivly) stored in one table (imagine a threaded forum). Each of the children has a title which should be indexed by ferret. Now we want to make a search that returns only the root and searches all items. So if one node has "expensive" and nother node has "car" I want to enter

Hope someone can tell me what''s up, because this has me baffled. I have an Image model, and a Provider model. Both are defined as "has_and_belongs_to_many" relating to each other. In my image form partial, I have a bit of AJAX generating the provider_ids array dynamically from a provider AJAX search on the same page. So for example, each time I click on a provider name that

Any idees why I can do this: @sum = @selected.inject(0) { |sum, player| sum + player.value } but not this: @sum = @selected.sum { |player| player.value } @sum = @selected.sum(&:value) The last two give me following error: wrong number of arguments (1 for 2) /Library/Ruby/Gems/1.8/gems/activerecord-2.0.2/lib/active_record/associations/association_collection.rb:164:in `calculate''

Most times I look up a list of books I want to know a page reference for each one, so the views that display booklists expect an array of two-element arrays, constructed via a method in the model like so: (class Category) def book @book = Array.new self.bookshelves.each { |x| @book << [x.book, x.pages] } return @book end When I get the list of all books that a user has

problem: validation error is not functionning in callback callback for many-to-many association: # keyword.rb :before_add => :reject_self_related def reject_self_related(related_keyword) if (related_keyword == self) # this does not work: errors.add(:name, "Relating a keyword to itself is forbidden!") raise "Relating a keyword to itself is

trying to set up a "has_and_belongs_to_many" relationship would very much appreciate the help, not sure what im doing wrong at all. Scheme.rb class Scheme < ActiveRecord::Base validates :schemename, :presence => true belongs_to :user has_many :levels, :dependent => :destroy has_and_belongs_to_many :works end Work.rb class Work < ActiveRecord::Base

Hi I get a following error: ActiveRecord::AssociationTypeMismatch in Cmdb#create ConfigurationItemAttributeValue expected, got Array RAILS_ROOT: ./script/../config/.. Application Trace | Framework Trace | Full Trace c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/active_record/associations/association_collection.rb:128:in `raise_on_type_mismatch''

Without getting too deep into my app I''m wondering if anyone has any clues what might give rise to the error posted below. It occurs when I run my unit tests. class Actor < AR:Base belongs_to :court_case end class CaseCause < AR:Base belongs_to :court_case end class CourtCase < AR:Base has_many :actors has_many :case_causes ... end def my_test_method ...

I ran into a problem using options_from_collection_for_select : ActiveRecord::AssociationTypeMismatch (Topic expected, got String): /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/ active_record/associations/association_collection.rb:128:in `raise_on_type_mismatch'' /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/

Hello, I am building an Rails applications that has to integrate an legacy system (lxoffice) (schema at: http://www.lx-office.org/uploads/media/DB_Schema_2.1.1_R_393_17_03_2005_.pdf). They somehow use global ids (global for some tables). I can not change the schema and still I want to use Rails to access it and not pure SQL. When I try to insert a record I get the following message:

Hi, I''m using an ActiveRecord::Observer to log users changing data in my application. However, I''ve noted that adding an item to a has_many relationship gets logged, but removing the item does not. That is: @product.users << user is logged, but: @product.users.delete(user) is not. I''ve dug into ActiveRecord and found that the underlying issue is that the

Hi, I''m really excited about getting the create() method working on a nested hash. The Rails book make it seem like I''m close to doing the right thing but I think something very small is not quite right. The error at the below isn''t giving any hints that I understand. I have a form that produces a nested params hash and sends it to my add_to_cart controller method.