app/models/trade.rb
# == Schema Information
#
# Table name: trades
#
# id :integer not null, primary key
# from_team_id :integer
# to_team_id :integer
# created_at :datetime
# updated_at :datetime
#
class Trade < ActiveRecord::Base
has_many :trade_items
has_many :trade_votes
belongs_to :from_team, :foreign_key => 'from_team_id', :class_name => "Team"
belongs_to :to_team, :foreign_key => 'to_team_id', :class_name => "Team"
end