Question

I need to write a scope that I will pass a user’s id through and will collect all the user’s list associates with all the companies for that user from the users table.

In User.rb:

has_many :employments
has_many :companies, :through => :employments, :dependent => :destroy
...

In Employment.rb:

belongs_to :user
belongs_to :company

In Company.rb:

has_many :employments
has_many :users, :through => :employments, :dependent => :destroy

This could be possible using something like:

current_user.companies.each{|c| c.users.each {|u| u}}

but writing like this I think is much more time consuming.

Answer 1

The following (not tested) scope finds all companies where a given user had work.

class Company
  has_many :employments
  has_many :users, :through => :employments, :dependent => :destroy

  scope :with_user, lambda { |user_id| joins(:employments).where(:user => user_id) }
  ...

Run rails c and execute try Company.with_user(User.last!.id) and see what happens.