similar to: Activerecord | Understanding associations

I am having issues with RoR/database relationships I have 3 tables Feeds (List of feeds) FeedItems (List of items, feedsID) FeedView (list of views and their list of feedsID) I would like to be able to generate a view with the feeditems For example, if the view has 2 feeds --> CNN & MSNBC and they both have 15 feeds in the feeditems table I want to be able to generate a view with cnn

Hi all, please pardon my question if it seems silly.. I''m trying pretty hard to learn though. :) I have 2 tables: feeds (has_many feed_items) feed_items (belongs_to feed) Let''s say Feeds has 3 feed.names: "Things that Start with A", "Things that start with B", "Things that start with C". I want to print out, on one page, something like the

Can someone clarify this for me? Suppose I have two tables like: class Company < ActiveRecord::Base belongs_to :category end class Category < ActiveRecord::Base has_many :companies end I understand that the belongs_to causes related companies to be read from the db when I ask for a category. I suspect SQL something like select * from categories, companies where category.id

I''m curious, but isn''t this example in the documentation for ActiveRecord::Associations::ClassMethods somewhat counter-intuitive? The SQL DDL is correct for the way it''s used in the models. But isn''t it more logical that an author would have many posts, rather than many authors having one post? From

I''d like to organise my active records into modules but can''t get the associations to work. The doc says that associations within the same module should work. I''ve tried using the class_name option too but still doesn''t work. Can anyone help? For example module Mod1 class Animal < ActiveRecord::Base has_many :dogs, :class_name =>

Hello, I found an interesting ER diagram on the "Module: ActiveRecord::Associations::ClassMethods" page of the Rails Framework Documentation : http://ar.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html At the beginning we can read ? Associations are a set of macro-like class methods for tying objects together through foreign keys. They express relationships like

A while back, I had some doubts on the use of associations. I still haven''t got a satisfactory guidance so that I can spring ahead with the project. I am trying to understand from a ruby point of view on doing things. Basically I have a controller that gives me a list of students. And each student may have say home address and mailing address. Hence I can model as shown below. How do I

Given the models Country, State, City and Person as follows. class Country < ActiveRecord::Base has_many :states end class State < ActiveRecord::Base belongs_to :country has_many :cities end class City < ActiveRecord::Base belongs_to :state has_many :people end class Person < ActiveRecord::Base belongs_to :city end Is there any way that doesn''t allow to delete

Is there some sort of good pattern for dealing with computed values with Rails/ActiveRecord? A simple example: 3 tables, classes, students, and student_class_records (habtm style relation but contains a good deal of additional state so is modeled explicitly) Something like select the 10 classes with the most students. Easy enough in SQL. So I''m using a lot of find_by_sql and

I have the following associations. class Document < ActiveRecord::Base has_many :document_sections, :dependent => :destroy, :autosave => true has_many :document_items, :through => :document_sections end class DocumentSection < ActiveRecord::Base belongs_to :document has_many :document_items, :dependent => :destroy, :autosave => true end class DocumentItem <

Hi, I''m still test driving the improved support for module namespaces in rails and I''ve hit a problem with associations between AR classes in modules and AR classes in the root namespace. The long and short of it is I want to be able to say: Foo::Bar.belongs_to :wibble, :class_name => "::Wibble" If you don''t try to prefix ''Wibble''

Hi, I am very new to rails.. I am having hard times to understand the ActiveRecord associations.. I tried http://guides.rubyonrails.org/association_basics.html .. But it is not for beginners. :) Is there any good tutorials, to understand the concept? Thanks -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on

Hello, I have a Company that has_and_belongs_to_many Persons. A Person has_many Emails. I want to display each Person''s Email for each Company, so I try this: companies = Company.find(:all) for company in companies persons = company.persons for person in persons puts person.email end end Unfortunately, this doesn''t work correctly. Let''s say the id of

I''m marshaling ActiveRecord objects, and I want them to be as small as possible. How can I unload everything that can be reloaded from the database? If they''re marshaled before any of the associations are referenced then the referenced objects aren''t dumped. But if the association has been loaded, how can I unload it? AssociationProxy.reset doesn''t seem to do

Is it possible to serialize ActiveRecord objects and ActiveRecord children to XML? -- Posted via http://www.ruby-forum.com/.

Hi everyone, I have the following classes: class User < ActiveRecord::Base devise :database_authenticatable, :registerable, :timeoutable, :recoverable, :rememberable, :trackable, :validatable has_many :comments, :dependent => destroy ... end class Comment < ActiveRecord::Base belongs_to :user belongs_to :commentable, :polymorphic => true ... end In rails console,

Is there any way to change the associations of a model at runtime, like before running a specific query? Chris --~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this

If an Order has_many Items, when do I have to call order.items(true) instead of just order.items to get the current list of items ? In Rails 1.1 if I call some_item.destroy, the order.items list doesn''t get updated unless I call order.items(true) -- this does not happen in Rails 1.0. Also when I add items to an order the list may or may not get updated depending on the Rails version

How do I write a test which proves something like "Post :has_many Comments" and "Comment :belongs_to Post"? It doesn''t seem to be covered in "A Guide to Testing the Rails" on manuals.rubyonrails.com. Cheers, Robert. -- Posted via http://www.ruby-forum.com/.

Hi, I''m having what I believe to be a typecast problem with ActiveRecord and Associations. In the code below, I need to flag a contact record for deletion if the contact doesn''t have any addresses or books records: sql = "select id, delete_flag from contacts where id = #{params[:id]}" contact = Contact.find_by_sql(sql) if (contact[0].addresses.count +