similar to: has_and_belongs_to_many polymorphic question

Hi, I''m currently having the situation where I have to implement a polymorphic has_and_belongs_to_many by introducing an in between model that handles all the "has_many :as" and "belongs_to :polymorphic" association implementations... and is not doing anything else. Thing I don''t like it here is, I am unnecessarily loading AR instances only to execute SQL

Hello, I am not sure of the best way to model this situation in Rails and would appreciate some guidance. An order can hold multiple line items. Each line item is for a certain number of any given product. There are four products, each in a different table because they have completely different attributes. So I have: Order - has many LineItems LineItem - belongs to an Order

Hi. I have a couple of best practices questions regarding polymorphic associations, naming join tables and user permissions. Currently I have implemented the user authentication model from the rails recipes book. Basically it goes something like this: MODEL CLASSES: class User < ActiveRecord::Base has_and_belongs_to_many :roles end class Role < ActiveRecord::Base

My app has an association that''s got me scratching my head. I have Users, and Images. A User has many Images. (Yes, another picture sharing app, but it''s for a small niche, and it doesn''t end in -r!) I would like to express a "Favorite" relationship between both Users to Users, and Users to Images. This seems like the opposite of the standard

I am using RoR ActiveRecord polymorphic inheritance and was wondering if it''s possible to access the base class'' association methods in the invocation of either to_xml or to_json without having to depict the base class data in the serialized string. Here are my classes: # base class class Asset < ActiveRecord::Base belongs_to :resource, :polymorphic => true

Hi ! (See references at the end) I have a slight problem. Whenever I save one of my domain models, which contains an has_and_belongs_to_many relationship with another one, the relationships are doubled. My domain is a series of pictures, where each picture can be tagged with one or more words. So, a picture of my dog could be tagged "Jordy, Dog, Dog 2005", for example. In my

Hello everyone, first post to the list and a relative newbie to Rails development. Done quite a bit of JSP, PHP, HTML, XML etc and thought I would kick the tires on Rails to see if it can speed up development for internal applications. Anyway, I am running into a problem that is just driving me crazy and everything I read on the net doesn''t seem to help. I was hoping someone here might

Hi all. I''m having a problem naming a polymorphic relationship. Here''s my thinking... First, an analogy. You''re walking through the mall. Through a window you see a game you''re interested. I''m attempting to model the relationship between your interest and the game you''re interested in. I have an InterestList. It''s job is to maintain

I''m having a problem with a has_and_belongs_to_many (habtm) association between two models with extra attributes. I''m writing a comic book database, and each issue has many creators on it. Thing is, some creators perform multiple duties. They may write one issue, draw another, etc. However, if I add a creator twice to an issue and try to delete it, it removes both creators:

I have an AR::Base descendant with a complex object graph beneath it, like so: ArtisanQuoteInput has_one QuoteInput and then QuoteInput has several objects attached to it. Note that the relationship between ArtisanQuoteInput and QuoteInput is polymorphic, so the relationship in A is written has_one :quote_input, :as => :program_quote_input If @artisan_quote_input is an instance of

I would like to associate a ‘product’ model with 3 models inherited from ‘image’: part, action and accessory. I have it working with Has_many :through relating products to images through attachments, I then have to determine the ‘type’ of the STI extension. This means i have to go product.images. While this is ok, i can see it getting tricky when i want to go products.images <<

I was able to create a has_and_belongs_to_many relationship for my app, but now I''m not too sure how to write queries for it. Basically, I have a table ''courses'' that has_and_belongs_to_many ''categories'' and vice versa So I''m trying to figure out how I would find only the courses that belong to a category that I specify. Let''s

I''m a little stumped on how to approach the subject of representing relationships between a single model object. Basically, I want a User to be able to mark others as Friends, Contacts, etc. The caveat is that User A can mark User B as a Friend but that doesn''t mean User A is marked as a friend by User B. It can either be a one-way relationship or two-way relationship. Right

I am working with mapping ActiveRecord onto a legacy database. All is going well (using set_table_name, set_primary_key, etc), but I can''t get my many<=>many relationships to work. My contrived example of the situation: Student has_and_belongs_to_many Teachers. This is mapped via table student2teacher where the foreign keys are studentId and teacherId. The primary key in Student

Can you use polymorphic with a habtm relationship? If so I would assume the join table would contain both the foreign key and the type for both sides of the table. The API documentation is unclear, although it may be out of date. I would prefer not to. I am trying to model a Person, who may be associated with many different models. A person may also be a member of one or more Teams, each of

Hi, I have a user model and a privilege model. They have the has_and_belongs_to_many relationship. Here are the model defs: class User < ActiveRecord::Base belongs_to :status has_and_belongs_to_many :privileges end class Privilege < ActiveRecord::Base has_and_belongs_to_many :users end Now I have a migration script to create the join table and populate a few users with some

I have a belongs_to polymorphic association and I don''t know how to create and edit my models of that relationship with active admin. If anyone can help me, please do. Thank you, Rodrigo -- 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

Hi all, I need to model simple typed polymorphic relations: ''John'' [''works_for''] ''Bill'' ''John'' [''speaks_for''] ''Microsoft'' ''Microsoft'' [''hold_shares_of''] ''Apple'' I''m having a hard time combining : - S.T.I.

Hello, I have a model called invoice and one called lineitem. An invoice has_many lineitems, and an lineitem belongs to an invoice. I have a model method that calculates the price of a lineitem, and one that calculates all lineitems in an invoice. I want to have an edit page that lists all the invoices lineitems and their calculated prices, with a text field for a person to change the

Hey all, Could use a few eyes on a couple of very simple patches at https://rails.lighthouseapp.com/projects/8994/tickets/6262 if any has some time. The issue (from the ticket description): If you define a polymorphic belongs_to association and it has conditions on it, those conditions cause a NameError when you try to access the target object, of the style saying "hey, there''s no