dm-accepts_nested_attributes
A DataMapper plugin that allows nested model attribute assignment like activerecord does.
Current documentation can always be found at rdoc.info
Examples
The following example illustrates the use of this plugin.
require "rubygems"
require "dm-core"
require "dm-validations"
require "dm-accepts_nested_attributes"
DataMapper::Logger.new(STDOUT, :debug)
DataMapper.setup(:default, 'sqlite3::memory:')
class Person
include DataMapper::Resource
property :id, Serial
property :name, String
has 1, :profile
has n, :project_memberships
has n, :projects, :through => :project_memberships
accepts_nested_attributes_for :profile
accepts_nested_attributes_for :projects
# adds the following instance methods
# #profile_attributes=
# #profile_attributes
# #projects_attributes=
# #projects_attributes
end
class Profile
include DataMapper::Resource
property :id, Serial
property :person_id, Integer
belongs_to :person
accepts_nested_attributes_for :person
# adds the following instance methods
# #person_attributes=
# #person_attributes
end
class Project
include DataMapper::Resource
property :id, Serial
has n, :tasks
has n, :project_memberships
has n, :people, :through => :project_memberships
accepts_nested_attributes_for :tasks
accepts_nested_attributes_for :people
# adds the following instance methods
# #tasks_attributes=
# #tasks_attributes
# #people_attributes=
# #people_attributes
end
class ProjectMembership
include DataMapper::Resource
property :id, Serial
property :person_id, Integer
property :project_id, Integer
belongs_to :person
belongs_to :project
end
class Task
include DataMapper::Resource
property :id, Serial
property :project_id, Integer
belongs_to :project
end
DataMapper.auto_migrate!
TODO
- collect validation errors from related resources
- update README to include more complete usecases
- think about replacing :reject_if with :if and :unless