drop_privileges_validator.rb
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	module ActiveModel
	module Validations
	class DropPrivilegesValidator < EachValidator
	def initialize(options)
	super
	setup!(options[:class])
	end

	def validate_each(record, attribute, _value)
	record.errors.add(attribute, options[:message]) if record.drop_privileges
	end

	private

	def setup!(klass)
	klass.send(:attr_reader, :drop_privileges) unless klass.method_defined?(:drop_privileges)
	klass.send(:attr_writer, :drop_privileges) unless klass.method_defined?(:drop_privileges=)
	end
	end

	module HelperMethods
	def validates_drop_privileges(*attr_names)
	validates_with DropPrivilegesValidator, _merge_attributes(attr_names)
	end
	end
	end
	end