Imagine two classes:

class Parent
  include DataMapper::Resource

  property :id, Serial
  property :name, String
  ...

class Child
  include DataMapper::Resource

  property :id, Serial
  property :position, Integer, :required => true, :default => -1

  belongs_to :parent, :key => true

When I do child.parent.name, I sometimes get an error indicating parent is nil. 
How is that possible when belongs_to defaults to required?

Please let me know how I can set up my associations so that this nil parent can 
never happen.

Thanks.

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