similar to: Polymorphic has_and_belongs_to_many association

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

I''ve got a situation where I''m trying to model the following relationship: a ''page'' has multiple lineitems a ''lineitem'' can be either a ''page'' or a ''entity'' The ''lineitem'' looks like it should be polymorphic but the ''page'' and ''lineitem''

Could someone please help me with this association scheme? I am familiar with habtm as well as the :through association but this one has me stumped. Here is an example DB. Tags Table: ------------------------- id name Taggables Table: -------------------------- id tag_id taggble_type taggable_id For purposes of this example say that there are 2 other tables that can be tagged and their model

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

Josh Susser tells in his blog that the opposite direction of polymorphic will get into trouble together with has_many through. This is the url: http://blog.hasmanythrough.com/articles/2006/04/03/polymorphic-through I do that according to Josh Susser''s procedure: class Tagging < ActiveRecord::Base belongs_to :tag belongs_to :taggable, :polymorphic => true belongs_to

1. A category has parent categories. 2. A product is in many categories and a category has many products. 3. Products and category both have images in the same image table. ie. a product and / or category could have multiple images.<=== my question is related to this So among other things I presume I have to do the following: class Category < ActiveRecord:Base #...

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

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

Say I have a post model that has_and_belongs_to_many :categories, and a category model that has_and_belongs_to_many :posts. So I have a categories_posts table to do the join. That''s all find and dandy. However I want to be able to find all the posts that belong to a specific category. I tried Post.find_by_category(:id) but that doesn''t work. Does anyone have any insight?

I don''t have a class by the name of "ReviewersScoreCard", yet my many to many configuration looks as follows. And, these errors while running some simple test with ./script/console is giving me a headache: ./script/console Loading development environment. >> r = Reviewer.find_first => #<Reviewer:0x19d0a48 @attributes={"id"=>"1",

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

I am trying to build a shared-appointment system, where users can subscribe to appointments and be updated whenever changes are made to them. I have three objects in this system, appointments, users, and subscribers. Subscribers are a polymorphic object like so: class Subscriber < ActiveRecord::Base belongs_to :user belongs_to :subscribable, :polymorphic => true end The tricky part is

Hello, is it possible to setup a model/table schema like this: Groupable --> Membership <-- Group ^ ^ | | User UserGroup I tried the following but failed: Groupable (table with ''type'' column) has_many :memberships, :as => :groupable has_many :groups, :through => :memberships

I''m experimenting with Rails on the Recipes example first before I dive into applying it to my intended application. I''m exploring which will be more work: to rename all the primary id''s in the legacy database, or to work around the fact that the primary id''s are not called ''id'' within RoR instead. I''ve been successful in using a

Hi. I''m hoping somebody can tell me that I''ve just gotten my syntax wrong and I can in fact do what I want to do. I''ve got a Group, and a Group has_many Campaigns. Campaign has_and_belongs_to_many Users (and, naturally, vice versa). So I''ve got a groups table, a campaigns table (that has a group_id), a campaigns_users join table (with campaign_id and

this is my model: class Person < ActiveRecord::Base has_many :phones, :as => :callable, :order => :position end class Phone < ActiveRecord::Base belongs_to :callable, :polymorphic => true acts_as_list :scope => :callable_id end how can i add the callable_type to the scope. how can i say the scope is the {:callable_id,:callable_type} couple? is it even possible? thanks

Hi, Why is it that polymorphic associations only work with the :has_many and :belongs_to relationships? Why can''t it be a :has_one? Matt

Hi, I began experimenting with habtm relationships, and so I created a stories table, a tags table, and a stories_tags table referencing the former 2. When I create a "story", I want to add several tags to it. Then, the model should create those tags and link them to the respective stories, and for the tags that already exists, just link them to the story. I tried something like

im having an issue where my my polymorphic associations arent being deleted when using accepts nested attributes there are other accepts_nested_attributes being used and they are deleting fine, just the polymorphic association before i go down the path of intense thrashing at this...is this a known issue or problem? -- Posted via http://www.ruby-forum.com/. -- You received this message because

Hi, If using a polymorphic belongs_to, is it possible to access the "_type" field that contains the name of the model ? Thanks! -- 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