attr_readonly

Icon_private_sm = private
Icon_protected_sm = protected

attr_readonly(*attributes) public

Attributes listed as readonly will be used to create a new record but update operations will ignore these fields.

# File activerecord/lib/active_record/base.rb, line 533
      def attr_readonly(*attributes)
        self._attr_readonly = Set.new(attributes.map { |a| a.to_s }) + (self._attr_readonly || [])
      end

August 5, 2011

To test if an attribute is defined readonly:

class MyModel < ActiveRecord::Base
  attr_readonly :important_type_thingie
end

#RSpec
describe MyModel do
 its('class.readonly_attributes') { should include "important_type_thingie" }

 it "should not update the thingie" do
   m = create :my_model, :important_type_thingie => 'foo'
   m.update_attributes :important_type_thingie => 'bar'
   m.reload.important_type_thingie.should eql 'foo'
 end
end

attr_readonly

Related methods

Speccing read_only requirements

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