similar to: Reading and saving data with belongs_to and has_many

In AWDWR David says (pg 232), "When a Join Wants to Be a Model: While a many-to-many relation with attributes can often seem like the obvious choice, it?s often a mirage for a missing domain model. When it is, it can be advantageous to convert this relationship into a real model and decorate it with a richer set of behavior. This lets you accompany the data with methods. As an example,

Hi, I''m having a bit of trouble with my first Rails app. ---- I have two tables: create_table :items do |t| t.column :created_at, :timestamp t.column :user_id, :int t.column :text, :text end create_table :users do |t| t.column :user_id, :int t.column :name, :string end ---- I''m trying to use the "user_id" field to link both tables, with each user

I have following tables with following models: users(id, role_id) *has_many :entries* categories(id, category_name) *has_many :entries* entries(id, category_id, user_id) *belongs_to :user, belongs_to :category, has_one :storage* storages(id, title, content, entry_id)* belongs_to :entry*, *has_one :vote* votes(id, count, storage_id) *belongs_to :storage* Now,

I am very new to Rails. After skimming through the documentation over the last several days, I''m struggling with the appropriate use of belongs_to. My main question is whether a model can have several belongs_to declarations. I have not seen any examples online show that usage. If it can, then I would like to know if it''s poor form or what the best practices are around

Hi All, Probably this has been asked numerous times, I apologize already! Can somebody point me to a good tutorial on how Rails works with relations? I know about database design and normalization, I also know about programming in general (and OOP for that matter). Only thing I can say is that I''m following the "Four days on Rails" tutorial by John McCreesh. He writes

I''m running into a situation where I''d like to provide the list scope for an acts_as_list model from one step removed. In minimalistic form (with several other associations removed from each level). class MainEntity < AcrtiveRecord::Base has_many :containers end class Container < ActiveRecord::Base has_many :elements belongs_to :main_entity end class

Two models: class Project << ActiveRecord::Base has_many :files end class File << ActiveRecord::Base has_one :project acts_as_tree end Inside of the project model, when creating a new product, I want to store the hierarchy of files within it. If I do, my_top_level_file = my_project_object.files.create(:file_name => ''foo'');

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)

Hello everyone, Here''s my problem for the day: I have three tables that look a little like the following table_a id table_b id position table_a_id name table_c id table_a_id table_b_position There will be many rows in table_c that have the same table_a_id, and the same table_b_position. These will all be referencing the same name value in table_b. The row in table_b may

I have a database with 4 tables Months has_many :weeks Weeks has_many :days Days has_many :hours Hours Weeks belong_to :month Days belong_to :week hours belong_to :day I need to access the month_id in the Hour.rb model. find(:first, :conditions => ["user_id = ? AND month_id = ?", user_id, month_id]) Thanks -- Posted via http://www.ruby-forum.com/.

I have a bit of code in a controller that looks like this: @current_festival.monitor_preferences.each do |pref| if pref.user_id == @me.id pref.preference = params[:monitor_pref] #pref.save end end @current_festival.save_with_validation(false) the Festival class has_many :monitor_preferences the MonitorPreference class belongs_to :festival In the configuration above, the

Hi, i am lost here, i have these models: class Shift < ActiveRecord::Base has_many :transactions,:dependent => :destroy has_one :exchangeproposal class Transaction < ActiveRecord::Base belongs_to :shift has_many :exchangeproposals class Exchangeproposal < ActiveRecord::Base belongs_to :shift belongs_to :transaction with these models i can''t destroy an

I am a bit confused about counter_cache here. The API docs http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html say that only the belongs_to association can take the :counter_cache option. When I try to use it on a has_many I get an "unknown key(s): counter_cache" error. Why would this be the case? belongs_to means that this model has a field with an id

I have users who belong to a group. I also have a room that belongs to a group. I want to use a has_many through association to link the room and the users as such: class Room < ActiveRecord::Base belongs_to :group has_many :users, :through => :group end The SQL generated for the search is incorrect: SELECT users.* FROM users INNER JOIN group ON users.group_id = groups.id WHERE

How can I save two models that have has_one and belongs_to relationship to each other? I want to save both the models by using script/console. TIA. --~--~---------~--~----~------------~-------~--~----~ 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

I have the following 3 models (2 models joined by an intermediate): 1. class Exercise < ActiveRecord::Base 2. has_many :routines, :class_name=>''RoutineExercise'' 3. end 1. class Routine < ActiveRecord::Base 2. has_many :exercises, 3. :class_name=>''RoutineExercise'', 4. :order=>''position'' 5. end 1. class

I have 2 models SmsAddress & OutboundSmsAtom SmsAddress { has_many :other_objects, :dependency => :nullify } OutboundSmsAtom { #note this object also "belongs_to" other objects if that matters belongs_to :this_object } Whenever I try to destroy an object of type ThisObject, which at the time has 0 "children" OtherObjects I get the following type of

Hi, Let''s say I''ve the following Models and their relative associations: Seat ---- belongs_to :booking Booking ------- has_many :seats has_many :debits, :as => :chargeable Debits ------ belongs_to :chargeable, :polymorphic => true Why >> seat.booking.debits nil while >> Booking.find(seat.booking_id).debits [] ? Thanks. Cheers, Marco

I have a relationship where a Show has_many Techs through People. From what I understand that requires me to put belongs_to Show in the People model. My problem is that a Tech can belong to many Shows. Is there any way of solving this besides putting a has_many Shows relationship in People -- Posted via http://www.ruby-forum.com/.

Hi, I am trying to use ActiveLdap for authentication in my rails app. But I am running into a problem with the "belongs_to" and "has_many" associations. Here ist how my models look like. class Person < ActiveLdap::Base ldap_mapping :dn_attribute => "uid", :prefix => "ou=People", :classes =>