For example:

class Person
  include DataMapper::Resource

  property :id,           Integer, :serial => true
  property :first_name,   String, :nullable => false
  property :last_name,    String

  has n :posts
end

class Post
  include DataMapper::Resource

  property :id,           Integer, :serial => true
  property :title,   String, :nullable => false
  property :body,  Text

  belongs_to :author, :class_name => "Person"
end

What would be the best way to validate the presence of an author when
a post is saved? I noticed that the documentation says that some
validations are automatically inferred (e.g., if :nullable => false
or :length is specified). Is there any way to include this validation
in the belongs_to method call? If not, what would anyone suggest?

Thanks!

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