Standup 5/28/2010: rails new :inverse_of association option automatically creates backreferences

Interesting Things

• has_many and belongs_to associations can now automatically create back references each other, thanks to a Backport of :inverse_of from Rails 3 to rails 2.3.6. This allows us to keep our object graphs more correct and avoid situations where we have 2 copies of the same object because the object graph is walked in reverse. Here's how to use it:

class Parent < ActiveRecord::Base
  has_one :child, :inverse_of => :parent
  accepts_nested_attributes_for :child
end

class Child < ActiveRecord::Base
  belongs_to :parent
  validates_presence_of :parent
end

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