search for: polymorphic

Hi, lets say I have a a table, "Linkings" that I am using for polymorphic associations. One of the associations is to the "person" table, and there are several other associations. "Person" has 2 types, "slacker" and "suckup". It is modelled as such: class Linking < ActiveRecord::Base belongs_to :person belongs_to :linkab...

...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 polymorphic model, i.e. tags and taggable, where a Tag may apply to many different types of Thing. Perhaps I''m not thinking of it properly, but this was my first stab at the relationship: ############################################################### class Image < ActiveRecord::Base # Can...

> Why do you say that people who compile, e.g., functional languages > would benefit from type variables in LLVM? > I like the level the LLVM is at, and would prefer to deal with > instantiating parametric polymorphism at a higher level. I'm surprised you're happy with a non-polymorphic llvm. Does Cayenne target llvm? Dependent types take polymorphism to new heights -- but perhaps you feel that since llvm cannot hope to match Cayenne, you might as well do everything yourself. :-) My reasons are: First, if type variables are handled at the higher-level, then every functional l...

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...

...^ | | User UserGroup I tried the following but failed: Groupable (table with ''type'' column) has_many :memberships, :as => :groupable has_many :groups, :through => :memberships Membership belongs_to :groupable, :polymorphic => true belongs_to :group, :polymorphic => true Group (table with ''type'' column) has_many :memberships, :as => :group has_many :groupables, :through => :memberships And the inherited tables: User < Groupable has_many :user_groups, :through => :memberships Us...

Here are a couple of articles I wrote describing a couple of handy helpers for dealing with polymorphic objects. These helpers allow you to generate urls and render partials on objects without knowing what class they are ahead of time. http://www.sciwerks.com/blog/2006/05/24/polymorphic-urls/ http://www.sciwerks.com/blog/2006/05/24/polymorphic-partials/ Hopefully you will find them useful. _Kev...

I am working on a small model mixin called attachment_kung to make attachment_fu polymorphic, so you no longer need a different table and Model class for every associated attachment (Productimage, Ad_doc, etc). All you really need is one model and table to handel all your attachments - in some cases, anyway. I have the code working, but have run into one small hitch that I can''t s...

Hi people, I''m looking into polymorphic associations as a way to cleanup some messy parts of my code. I think they will allow me to do exectly what I need, but since there''s little to none written on this subject, I''d be delighted if someone could shed some light on this. Especially what the different options and ne...

I have the following models: class Card < ActiveRecord::Base belongs_to :deck belongs_to :front, :polymorphic => true belongs_to :back, :polymorphic => true end class TextContent < ActiveRecord::Base has_one :card, :as => :front has_one :card, :as => :back end The conflicting has_one declarations don''t work. What I need is a way to name the belongs_t...

...;s why there''s one table for uk_counties and one for us_counties, with more to follow when more countries are supported). This would require: class User... has_many :counties, :through => user_counties #counties is the imaginary table end class UserCounties belongs_to :counties, :polymorphic => true end Is this possible? If not, can anyone think of a way around it other than adding another table into the chain? And (bonus question... not required, just for fun) what would the reverse relationship look like (ie, how would uk_counties relate to users)? -Nathan

Hey guys, I''ve been thinking lately about polymorphic associations, and I wonder: is there a noticeable or tangible performance "hit" from doing polymorphic associations when you''ve got your database under really high query load? So for example, maybe I have a "message" model, a "user" model and an "adminis...

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 that users already own appointments, so I can''t create a simple users.appointments association. I can find users by calling appointment.s...

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...

Hi, I''m just playing with ActiveResource and I did''nt find anything about the support of (polymorphic) associations. Is there a support at all? Thanks in advance --~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3Mb...

If anybody on edge familiar with this could help, that would be "great" :) I have different types of things I want to be "reviewable". So, instead of having a slew of HABTM... this new Polymorphic Associations schtick seemed like the best solution. I have everything setup as I thought it should be (so I think)... but it doesn''t appear to be working correctly. Here is my setup: User (table Clients: basic user stuff belonging to a functional STI relationship) ========== de...

...''m having trouble figuring out how to describe a certain relationship. I''m building a social networking site where you have users who can comment on other users, photos, videos, and blogs. I''ve figured out how to have a comment belong to a user or media item through a polymorphic relationships but I dont'' know how to have the comment also be "owned" by the user who made the comment. I''ve included some code to help with the description: #User class class User < ActiveRecord::Base has_many :photos has_many :blogs ... end #photo (also blog an...

Why do you say that people who compile, e.g., functional languages would benefit from type variables in LLVM? I like the level the LLVM is at, and would prefer to deal with instantiating parametric polymorphism at a higher level. On Wed, Feb 18, 2009 at 10:43 PM, DeLesley Hutchins <delesley.spambox at googlemail.com> wrote: >> I think many people were confused by this at first but an

...hat people who compile, e.g., functional languages > > would benefit from type variables in LLVM? > > I like the level the LLVM is at, and would prefer to deal with > > instantiating parametric polymorphism at a higher level. > > I'm surprised you're happy with a non-polymorphic llvm. Does > Cayenne target llvm? Dependent types take polymorphism to new > heights -- but perhaps you feel that since llvm cannot hope to > match Cayenne, you might as well do everything yourself. :-) > > My reasons are: > > First, if type variables are handled at the high...

Is there any sort of dynamic finder for polymorphic associations? For example if I had: class InviteNode < ActiveRecord::Base belongs_to :inviteable, :polymorphic => true end I would like to be able to search by: InviteNode.find_by_inviteable(some_object) instead of having to do: InviteNode.find_by_inviteable_id_and_inviteable_type(som...

I''ve been using polymorphic joins from edge rails based on about 5 lines of advice Rick Olson gave me over IRC. There''s some sparse documentation popping up but it seems to cover a somewhat different case. Anyway - I pretty much got it to work - save for one detail. Here''s what I have: class Event <...