similar to: how to prevent child.save() when doing parent.save() in associations?

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_one(:car) end class Car belongs_to(:student)

Hi all. 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

Hi. I''m building a setup where I have users and groups, and a user can have an optional title in a group (eg. "owner"). I''m doing this using "has_many :through" associations, using a Role model object as the join hub: class User < ActiveRecord::Base has_many :roles, :dependent => :destroy has_many :groups, :through => :roles end class

Hello all, I have an Order object that has and belongs to many Products and has and belongs to many Loan Types. This is so I can select multiples of each in my order entry screen via checkbox groups. I''m having some trouble with saving multiple HABTM associations for a single model object; only the first HABTM association declared in the model will save during the initial @order.save

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 does get called

Hi Does anyone have a good pattern for using a sinlge form for a model with multiple associations including some has_many''s? For example I have a Property model with a has_one association an Address model and a has_many association to a Highlight model. I would like to update these all on the same page however if I render the main Property form, then use a partial for the address and

I''m having a difficult time wrapping my head around a set of models and their associations and seeing how 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

I''m willing to write a patch for this issue: https://github.com/rails/rails/issues/8893 But want to confirm that the new behavior makes sense before I make the effort. Essentially if you have an unsaved parent and child, and the parent''s association to the child has an inverse_of declared on it. When the parent gets saved, it updates the foreign key on the child, and this

I have a Company object which has multiple Contacts (has_many/belongs_to) I would like one of the contacts to be the primary contact. What''s the best way to do this? Right now I have: create table companies ( id int not null auto_increment, name varchar(50) not null, primary_id int null, constraint fk_company_primary_contact foreign key (primary_id) references contacts(id),

hi, I found a bug in ActiveRecord association SQL INNER JOIN codes. in has_many, has_one, habtm and belongs_to queries the foreign key is determined from the table name of reflection and self. but that''s worng because if you use a global prefix or suffix for your tables the foreign keys will be in format of PREFIX_CLASSNAME_SUFFIX_id which is wrong, because it breaks the advantage of

Hi, I''m struggling with something that must be very common pattern, and want to do it the correct rails/ruby way but am a bit dense ! I have users - an admin user, registered users and a guest user (using ModelSecurity) For many of linked associations I want the admin to be able to list or edit all instances, the registered user only their own one and guest none at all. So somehow I

If I ''find'' using :include, and some included associations are null, then looping through the array executing ''if obj[i].assoc'' accesses the database for a second time (as obj.assoc is nil). eg Topic, has_many posts Post has_one email and posts = Post.find(:all, :condition => ''posts.topic_id = 10'', :include =>

This is really bugging me. How can I get a second association to work between 2 tables. I have two models, User and Article. A user has many articles, and an article belongs to one user. Then I have the "current article", which is a the article that the user is currently viewing/editing. I want to track/save this value, so they can come back to the same article if they log out

Hi All I have been struggling with this issue for a long time now. And before I began to describe the problem its important to know that this problem happens only in Development environment. I am using Rails 2.0.2, here are my associations class User has_many :comments has_one :profile, :as => :profileable delegate :email, :to => :profile end First call to comment.user.email works

Acts as automatic has two purposes: 1) provide acts_as_automatic act, which will automatically run the appropriate methods when conventions are adhered to (e.g. if you have category_id, it will assume that the model belongs_to :category). Only belongs_to via something_id is currently implemented. 2) Allow the creation of associations.yml, which will hold associations instead of inside each

I have 3 models . Doctor, Patient and User with following associations class Doctor < ActiveRecord::Base has_many :patients, :dependent => :destroy has_one :user, :as => :userable accepts_nested_attributes_for :user end class Patient < ActiveRecord::Base belongs_to :doctor has_one :user, :as => :userable accepts_nested_attributes_for :user end class User <

I am trying to create a record with association. Within the create method, I would also like to pre-populate dependent (has_many) records from a template in the database. The child records are <u>mysteriously rolled back </u> if I insert them in a loop. If I try to insert a single child record, it works.I have read the books and tried to google my way out of this but am at a dead

Hi... Isn''t there a proper way or hack/workaround for the following? * For the example with unfortunate disabilities.. look below,,, Usage of has_* (associationmethods) do {def with_deleted AccociatedModel#with_scope} {Paranoid''s#find_with_deleted}... The has_one associations give me a nil object when invoking it with Model.association_OBJECT.with_deleted. Has_many does like

Hi.. Guys new plugin again Foreign Key Associations is a plugin that automatically creates associations based on foreign-keys. The associations are created at runtime-ie. as your ActiveRecord models are loaded-so they will always be up-to-date. For example, given a foreign-key from a customer_id column in an orders table to an id column in a customers table, the plugin creates:

Hi, I am trying to overwrite the accessor of a has_many association. Basically my class looks like this: class Person has_many :emails has_one :link, :class_name => ''PersonProxy'' def emails_with_link link.emails + emails_without_link end alias_method_chain :emails, :link end Now that works fine if I only access the collection like >>