>> t = Task.new :name => "test"
t = Task.new :name => "test"

=> #<Task id: nil, name: "test", priority: nil, duration: nil, description: nil, parent_id: nil, created_at: nil, updated_at: nil>

>> t.users
t.users

=> []

>> ref = TaskReference.new
ref = TaskReference.new

=> #<TaskReference id: nil, user_id: nil, parent_id: nil, position: nil, task_id: nil, role: nil, created_at: nil, updated_at: nil>

>> ref.user = User.first
ref.user = User.first

=> #<User id: 1, login: "quentin", email: "quentin@example.com", crypted_password: "00742970dc9e6319f8019fd54864d3ea740f04b1", salt: "7e3041ebc2fc05a40c60028e2c4901a81035d3cd", created_at: "2009-05-22 15:44:50", updated_at: "2009-05-27 15:44:50", remember_token: nil, remember_token_expires_at: nil>

>> t.task_references << ref
t.task_references << ref

=> [#<TaskReference id: nil, user_id: 1, parent_id: nil, position: nil, task_id: nil, role: nil, created_at: nil, updated_at: nil>]

>> t.users
t.users

=> []

>> t.task_references
t.task_references

=> [#<TaskReference id: nil, user_id: 1, parent_id: nil, position: nil, task_id: nil, role: nil, created_at: nil, updated_at: nil>]