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Contents
# frozen_string_literal: true
module ActiveRecord
module ReadonlyAttributes
extend ActiveSupport::Concern
included do
class_attribute :_attr_readonly, instance_accessor: false, default: []
end
module ClassMethods
# Attributes listed as readonly will be used to create a new record but update operations will
# ignore these fields.
#
# You can assign a new value to a readonly attribute, but it will be ignored when the record is updated.
#
# ==== Examples
#
# class Post < ActiveRecord::Base
# attr_readonly :title
# end
#
# post = Post.create!(title: "Introducing Ruby on Rails!")
# post.update(title: "a different title") # change to title will be ignored
def attr_readonly(*attributes)
self._attr_readonly = Set.new(attributes.map(&:to_s)) + (_attr_readonly || [])
end
# Returns an array of all the attributes that have been specified as readonly.
def readonly_attributes
_attr_readonly
end
def readonly_attribute?(name) # :nodoc:
_attr_readonly.include?(name)
end
end
end
end
Version data entries
43 entries across 41 versions & 6 rubygems