thread_mattr_accessor

Defines both class and instance accessors for class attributes.

class Account thread_mattr_accessor :user end Account.user = "DHH" Account.user # => "DHH" Account.new.user # => "DHH" 

Unlike mattr_accessor, values are not shared with subclasses or parent classes. If a subclass changes the value, the parent class’ value is not changed. If the parent class changes the value, the value of subclasses is not changed.

class Customer < Account end Account.user # => "DHH" Customer.user # => nil Customer.user = "Rafael" Customer.user # => "Rafael" Account.user # => "DHH" 

To omit the instance writer method, pass instance_writer: false. To omit the instance reader method, pass instance_reader: false.

class Current thread_mattr_accessor :user, instance_writer: false, instance_reader: false end Current.new.user = "DHH" # => NoMethodError Current.new.user # => NoMethodError 

Or pass instance_accessor: false, to omit both instance methods.

class Current thread_mattr_accessor :user, instance_accessor: false end Current.new.user = "DHH" # => NoMethodError Current.new.user # => NoMethodError 

A default value may be specified using the :default option. Because multiple threads can access the default value, non-frozen default values will be duped and frozen.