Question

I have 3 model

class User < ActiveRecord::Base
  has_many :profiles
  has_many :companies, :through => :profiles
end

class Company < ActiveRecord::Base
  has_many :profiles
  has_many :users, :through => :profiles
end

class Profile < ActiveRecord::Base
  belongs_to :company
  belongs_to :user
end

when I want to query all companies form user. I just type

u = User.find(:first)
companies = u.companies

But when I want to query only companies that have

profile.is_publish == ture

---

What is the right way I should do

First: I should create method in User to do that

def published_companies
  companies.where('profiles.is_publish' => true)
end

companies = u.published_companies

Second: I should create scope in Company

scope :published, joins(:profiles).where('profiles.is_publish' => true)

companies = u.companies.published

Third: I should create a scope in Profile

companies = u.profile.published.companies

the first way is easy one and the third is cool but I don’t know How to do it.

Answer 1

Create the scope on Company like:

scope :published, where(:is_publish => true)

Then on user you call:

user.companies.published

To check the validness of the code you can use to_sql method.