I have the below models:
class Foo < ActiveRecord::Base
has_many :bars
end
class Bar < ActiveRecord::Base
belongs_to :foo
end
In the business logic, when initializing an object foo f = Foo.new three bars need to be initialized, too.
How can I do this?
You can use after_create(after calling Foo.create) or after_initialize(after calling Foo.new) in your Foo.rb
after_create :create_bars
def create_bars
3.times do
self.bars.create!({})
end
end
Or:
after_initialize :create_bars
def create_bars
3.times do
self.bars.new({})
end if new_record?
end
after_initialize is deprecated. Is it this possible? I can't use after_create because this method save on database. In my case, I will save after
You can:
The code will then look like this:
class Foo < ActiveRecord::Base
has_many :bars, autosave: true
after_initialize :init_bars
def init_bars
# you only wish to add bars on the newly instantiated Foo instances
if new_record?
3.times { bars.build }
end
end
end
You can add the option dependent: :destroy if you wish Bar instances get destroyed when you destroy the parent Foo instance.
you can define that in the initialize method of the Foo class. Initializer block will run whenever the Foo object gets created and you can create the related objects in that method.
