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# frozen_string_literal: true
# Helper that sets attributes to nil prior to validation if they
# are blank (are false, empty or contain only whitespace), to avoid
# unnecessarily persisting empty strings.
#
# Model usage:
#
# class User < ApplicationRecord
# include NullifyIfBlank
#
# nullify_if_blank :name, :email
# end
#
#
# Test usage:
#
# RSpec.describe User do
# it { is_expected.to nullify_if_blank(:name) }
# it { is_expected.to nullify_if_blank(:email) }
# end
#
module NullifyIfBlank
extend ActiveSupport::Concern
class_methods do
def nullify_if_blank(*attributes)
self.attributes_to_nullify += attributes
end
end
included do
class_attribute :attributes_to_nullify,
instance_accessor: false,
instance_predicate: false,
default: Set.new
before_validation :nullify_blank_attributes
end
private
def nullify_blank_attributes
self.class.attributes_to_nullify.each do |attribute|
assign_attributes(attribute => nil) if read_attribute(attribute).blank?
end
end
end
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