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The behavior between a has_one and has_many association differs if an association class is missing (i.e. if `Widget` is not defined):

Has One:

class User
  include Mongoid::Document
  has_one :widget
end

User.new.valid? # true

Has Many:

class User
  include Mongoid::Document
  has_many :widgets
end

User.new.valid? # raises NameError (uninitialized constant Widget)

This only impacts new records. For example:

User.create
User.last.valid? # correctly raises an exception