Rails accepts_nested_attributes_for and build_attribute with polymorphic relationships
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Published on 2010-06-15T00:21:49Z
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2010/06/15
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ruby-on-rails
|relationship
The core of this question is where build_attribute
is required in a model with nested attribuites
I'm working with a few models that are setup like:
class Person < ActiveRecord::Base
has_one :contact
accepts_nested_attributes_for :contact, :allow_destroy=> true
end
class Contact < ActiveRecord::Base
belongs_to :person
has_one :address, :as=>:addressable
accepts_nested_attributes_for :address, :allow_destroy=> true
end
class Address < ActiveRecord::Base
belongs_to :addressable, :polymorphic=>true
end
I have to define the new
method of people_controller
like:
def new
@person = Person.new
@person.build_contact
@person.contact.build_address #!not very good encapsulation
respond_to do |format|
format.html # new.html.erb
format.xml { render :xml => @person }
end
end
Without @person.contact.build_address
the address
relationship on contact
is NIL
. I don't like having to build_address
in people_controller
. That should be handled by Contact
. Where do I define this in Contact
since the contacts_controller
is not involved here?
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