search for: has_one

I have a problem with the :include option in find for my has_one :through association. I have Users, Profiles and Customers, all connected to each other with a has_one :through => :membership association like this: class Profile < ActiveRecord::Base #could also be user or customer has_one :membership # i saw an acrticle of Ryan about has_one :through,...

...they map into Rails. I''ll try to lay out my problem using the has_many and belongs_to structures. I have a RuleSpace, a Rule, and a Subject. A RuleSpace has_many Rules A RulesSpace has_many Subjects through Rules A Rule belongs_to (many) RuleSpaces A Rule has_many Subjects A Subject has_one Rule A Subject has_one RuleSpace So given a single Subject I should be able to find a single Rule and a single RuleSpace. Going the other way, given a RuleSpace I should find many Subjects. I''m thinking the model definitions should look like this: class RuleSpace < AR::Base ha...

...And I have two other tables that contains states: houses id color state_id places id place_name state_id How would my model relationships look like? class State < ActiveRecord::Base belongs_to house belongs_to place end class House < ActiveRecord::Base has_one state end class Place < ActiveRecord::Base has_one state end Is that right? Can I have a model that belongs to multiple models? -- Vincent H Gov -------------- next part -------------- An HTML attachment was scrubbed... URL: http://wrath.rubyonrails.org/pipermail/rails/attachments/200603...

...f thumbnails (stored with file_column) and Textile fields. I start out with class Item < ActiveRecord::Base :has_many :pictures end class But I want one of those pictures to be featured as the gallery photo. So, naturally, I gravitate towards adding class Item < ActiveRecord::Base :has_one primary_picture, :class_name => ''Picture'' end I am encouraged in this futile pursuit by the docs, which I quickly skim to see things like :has_one :last_comment, :class_name => "Comment", :order => "posted_on" Of course, in the light of day, it...

...validates_presence_of :name, :on => :create, :message => "can''t be blank" validates_uniqueness_of :name, :message => ''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 = ?'', &...

MODEL class User < ActiveRecord::Base has_one :address, :dependent => :destroy accepts_nested_attributes_for :address end CONTROL def new @user = User.new @user.build_address # Adicionei ... VIEW partial _form .... <% f.fields_for :address do |b| %> # Adicionei <%= b.text_field :city_manual %> # Adicion...

I have the following models: class Resume belongs_to :resume_assignments end class User belongs_to :resume_assignments end class ResumeAssignment has_one :resume has_one :user end When I delete a resume, I want to make sure that its associated ResumeAssignment gets deleted also. Calling destroy_all to delete some resumes doesn''t seem to do this. Is there an option that will make it do this? Thanks, Carl

...Got a stupid-simple question about associations. I have two models - school and course. There are a fixed number of schools (set up in the migration). Each course is assigned a school and a school will be associated with multiple courses... How do I set up the associations? Do (can) I have School :has_one :course and Course :has_many :schools? Does the schools table then get a course_id field or the other way around? I don''t think I should have course :belongs_to School, as there will only be one instance of a school in the Schools table. Thanks! jt

...w process, represented by a state machine (this is not a state machine question). So there are two state machine classes that differ slightly and subclass a generic StateMachine: class ScholarshipApplication belongs_to :state_machine end class StateMachine end class StateA < StateMachine has_one :application end class StateB < StateMachine has_one :application end The problem is I can get a ScholarshipApplication instance to tell me its StateMachine, but the StateMachine can''t tell me it''s ScholarshipApplication. E.g.: app = ScholarshipApplication.create state =...

...andle normalized informations which aren''t connected via the pk? create table what ( myid int, myclass int, ;; references blahclass.blahid mygender int ) create table blahclass ( blahid int, mdesc1 text, fdesc1 text) ) I would like to wrap this as class What < AR::Base has_one :blahclass class Blahclass < AR::Base belongs_to :who The problem is that a lookup of who.blahclass uses the who.pk to get the Blahclass record, but it should use who.blahclass. I dont find a way to specify this. Of course it would be easy to hardwire the logic into a method, but i would l...

Hey Guys, I''m getting a peculiar bug working with Observers and has_one associations. When a has_one association is invoked by an Observer it always returns null. I looked in the development.log file and the SQL for the has_one association isn''t even being executed. On the other hand, when I replace the has_one association with just a hand crafted method, it...

...alse t.column :country, :string t.column :addressable_id, :integer t.column :addressable_type, :string This would appear to give me the basic polymorphic assocation. Here is my challange. Mapping to location seems simple: class Location < ActiveRecord::Base has_one :address, :as => :addressable end What I''m having trouble with is the company model. I''ve currently got: class Company < ActiveRecord::Base has_one :main_address, :as => :addressable has_one :billing_address, :as => :addressable has_...

While I''m happy to continue talking about the vagaries of Rails deployments, I also need to actually build apps. :) I may have discovered a bit of a problem with :include as it applies to has_one associations. First, let me say that I''m a big fan of :include for reducing the number of SQL calls. There are times when I wish it could go more than 1 step away from the parent object, but I kind of understand why it can''t. Now, on to my "discovery"... Completely...

Hi, I''m trying to write a blog application where each post has a single header image associated. My models: ---------- class Post < ActiveRecord::Base belongs_to :blog has_many :images has_one :header end class Header < ActiveRecord::Base file_column :image_path end class Image < ActiveRecord::Base belongs_to :post file_column :image_path end The controller targets I have used: ----------------------------------- def uploadImage Post.find(params[:id]).images.create(pa...

Hello, I''ve come across an issue that I''m sure is a bug when using after_create with a has_one association, but I''m not 100% certain if I''m missing something. This is pretty much exactly the code I''m using. Two simple classes (Account and Contact) and I create the contact after I create an account (via after_create). I''m not passing in a "name&quot...

Hi, I am very confused about an aspect of has_one and has_many relations, with regard to using the build method, and saving the belongs_to side. It''s a somewhat long post. so please bear with me :) First let''s consider the has_one scenario. Let''s say I have a student who must own exactly one car: class Student has_on...

I have two models called entity and user. The entities table has a column called users_id that contains the user id of the user that created the entity. In entity I have... has_one :user ... as I want to be able to show the user who created the entity from the entity object. But this produces the following error... Mysql::Error: #42S22Unknown column ''users.entity_id'' in ''where clause'': SELECT * FROM users WHERE (users.entity_id = 1) L...

A lot has been posted about validation issues with associations, however, I don''t see this issue addressed specifically. ex: class Foo has_one :schedule, :dependent => :destroy validates_presence_of :schedule class Schedule belongs_to :foo validates_presence_of :foo_id this creates a circular dependency that breaks test frameworks like pickle and machinist. At first I was surprised a little that you can contsruct objects with t...

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_to associations ''front'' and ''back'', but have them go through a single interface, which the T...

People, In the cookbook eg, categories has_many recipes but in a book eg, book has_one description - doesn''t that mean that the id of the description should be the same as the id of the book (instead of having it''s own "description_id" in the book table? Thanks, Phil. -- Philip Rhoades Pricom Pty Limited (ACN 003 252 275 ABN 91 003 252 275) GPO Box 3...