instance method
thread_mattr_accessor
Ruby on Rails edge
Since v5.0.7.2Signature
thread_mattr_accessor(*syms, instance_reader: true, instance_writer: true, instance_accessor: true, default: nil)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 ‘dup`ed and frozen.
Parameters
-
symsrest -
instance_readerkey = true -
instance_writerkey = true -
instance_accessorkey = true -
defaultkey = nil
Source
# File activesupport/lib/active_support/core_ext/module/attribute_accessors_per_thread.rb, line 195
def thread_mattr_accessor(*syms, instance_reader: true, instance_writer: true, instance_accessor: true, default: nil)
thread_mattr_reader(*syms, instance_reader: instance_reader, instance_accessor: instance_accessor, default: default)
thread_mattr_writer(*syms, instance_writer: instance_writer, instance_accessor: instance_accessor)
end
Defined in activesupport/lib/active_support/core_ext/module/attribute_accessors_per_thread.rb line 195
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