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module ActiveRecord::Associations::Builder
class HasOne < SingularAssociation #:nodoc:
def macro
:has_one
end
def valid_options
valid = super + [:order, :as]
valid += [:through, :source, :source_type] if options[:through]
valid
end
def constructable?
!options[:through]
end
def valid_dependent_options
[:destroy, :delete, :nullify, :restrict_with_error, :restrict_with_exception]
end
private
def add_before_destroy_callbacks(model, name)
super unless options[:through]
end
end
end
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