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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 build
reflection = super
configure_dependency unless options[:through]
reflection
end
private
def configure_dependency
if dependent = options[:dependent]
check_valid_dependent! dependent, [:destroy, :delete, :nullify, :restrict]
dependent_restrict_deprecation_warning if dependent == :restrict
send("define_#{dependent}_dependency_method")
model.before_destroy dependency_method_name
end
end
def define_destroy_dependency_method
name = self.name
mixin.redefine_method(dependency_method_name) do
association(name).delete
end
end
alias :define_delete_dependency_method :define_destroy_dependency_method
alias :define_nullify_dependency_method :define_destroy_dependency_method
def dependency_method_name
"has_one_dependent_#{options[:dependent]}_for_#{name}"
end
end
end
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