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-rw-r--r--activesupport/lib/active_support/core_ext/class/attribute_accessors.rb10
1 files changed, 10 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/class/attribute_accessors.rb b/activesupport/lib/active_support/core_ext/class/attribute_accessors.rb
index cdc7cfc1d4..4e35b1b488 100644
--- a/activesupport/lib/active_support/core_ext/class/attribute_accessors.rb
+++ b/activesupport/lib/active_support/core_ext/class/attribute_accessors.rb
@@ -14,6 +14,16 @@ require 'active_support/core_ext/array/extract_options'
# Person.hair_colors = [:brown, :black, :blonde, :red]
# Person.hair_colors #=> [:brown, :black, :blonde, :red]
# Person.new.hair_colors #=> [:brown, :black, :blonde, :red]
+#
+# To opt out of the instance writer method, pass :instance_writer => false.
+# To opt out of the instance reader method, pass :instance_reader => false.
+#
+# class Person
+# cattr_accessor :hair_colors, :instance_writer => false, :instance_reader => false
+# end
+#
+# Person.new.hair_colors = [:brown] # => NoMethodError
+# Person.new.hair_colors # => NoMethodError
class Class
def cattr_reader(*syms)
options = syms.extract_options!