How do I use inheritance with ActiveRecord models in rails?

Question

I currently have a User (has_many: address_book_users) and an AddressBookuser (columns: user_id, user_id_inserted)

Currently, when I call user.address_book_users, I get back an array on ints, like [3, 4, 5] which correspond to users which are in my address book.

When iterating through this array I have to do a:

for uid in user.address_book_users 
  user = User.find(uid)

to get access to each user.

What would be a better way to do this, or should I remodel my relationship somehow to where Rails knows that column user_id_inserted refers to an ID of a user?

check out has_and_belongs_to_many and has_many :through

Matthew Rudy
– Matthew Rudy

2011-12-10 18:30:33 +00:00
Commented Dec 10, 2011 at 18:30 — Matthew Rudy
– Matthew Rudy, Commented Dec 10, 2011 at 18:30

dombesz · Accepted Answer · 2011-12-10 20:54:27Z

1

First you have to name the AddressBookUser model's user_id_inserted like, contact.

class AddressBookUser < ActiveRecord::Base
  belongs_to :contact, :foreign_key=>'user_id_inserted', :class_name=>'User'
end

Then define a has_many :through relation.

class User < ActiveRecord::Base
  has_many :contacts, :through=> :address_book_users
end

Then call user.contacts and you should receive all the users on addressbook.

answered Dec 10, 2011 at 20:54

dombesz

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