Question

I have a Team object and a Game object.

A Game is supposed to have one winner which is a Team
A Team can be the winner of multiple Games

How can I structure this correctly? I’m using Mongoid

This is what I came up with so far…

class Game
  include Mongoid::Document
  include Mongoid::Timestamps
  has_one :winner, :class_name=>Team
end

class Team
  include Mongoid::Document
  include Mongoid::Timestamps
  has_and_belongs_to_many :games_won, :class_name=>"Game", :inverse_of => :Game 
end

Answer 1

Consider abstracting the win out into its own class, so that:

class Game
  has_one :win
end

class Team
  has_many :wins
end

class Win
  belongs_to :game
  belongs_to :team
end

This makes the structure more logical, makes the code simpler, and has other advantages for situations where you might want to start working with wins as a separate resource for other reasons.