accessing previous methods in a chain (Ruby (on Rails))

Question

Lets say I have classes for employees, managers, and companies. These inherit from ActiveRecord and are all associated as you might expect.

I have two instances of the Employee class, bob and jane. They both work for the same company but have different managers.

I want to be able to call bob.company.x or jane.company.x and get different results because, although they work for the same company, they have different managers. There are other limitations that prevent me from just defining x as a method for employees and calling bob.company_x, which I realize would be simpler in this example.

Is there any way that I can know, within my method definition for x, which employee started this method chain?

Answer 1

What you propose cannot be done in a clean and simple way, and aside of that, is counter-intuitive.

class Employee
  belongs_to :company
  belongs_to :manager
end

is the only clean solution. This has the relations cleanly defined. These relations need to be available anyway: how would you know which is the manager for bob?

A solution, as you propose, where you can write bob.company.my_manager does not make sense, because bob.company is his company, and at that level (Company) there is no more knowledge of bob.

For completeness sake: actually a manager is an employee itself, so we would write that relation a bit differently:

class Employee
  belongs_to :manager, :class => Employee
end

(and in your employees table you need to add a field manager_id).

Hope this helps.