gistfile1.rb

class User
  has n, :team_users
  has n, :teams, :through => :team_users
end

class Team
  has n, :team_users
  has n, :users, :through => :team_users
end

class TeamUser
  belongs_to :team
  belongs_to :user
  
  property :team_id, Integer, :key => true
  property :user_id, Integer, :key => true
end