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require 'active_support/concern'
require 'active_support/core_ext/class/attribute'
module ActiveRecord
module ReadonlyAttributes
extend ActiveSupport::Concern
included do
class_attribute :_attr_readonly, :instance_writer => false
self._attr_readonly = []
end
module ClassMethods
# Attributes listed as readonly will be used to create a new record but update operations will
# ignore these fields.
def attr_readonly(*attributes)
self._attr_readonly = Set.new(attributes.map { |a| a.to_s }) + (self._attr_readonly || [])
end
# Returns an array of all the attributes that have been specified as readonly.
def readonly_attributes
self._attr_readonly
end
end
end
end
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