Datamapper DataMapper

If you have a Model (which has a number of existing resources) that you add a new has 1 relationship to, defaults for that relationship will not be respected.

class Parent
  include DataMapper::Resource
  property :id, Serial

  has 1, :child, :default => proc { Child.new }
end

class Child
  include DataMapper::Resource
  belongs_to :parent, :key => true
end

If the models are as shown, then:

@existing_parent = Parent.first
@existing_parent.child
#=> nil

@new_parent      = Parent.new
@new_parent.child
#=> #<Child ...>

See the attached ticket for a script to demonstrate the problem.