method

thread_mattr_writer

v7.1.3.2 - Show latest stable - 0 notes - Class: Module

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What's this?

thread_mattr_writer(*syms, instance_writer: true, instance_accessor: true) public

Defines a per-thread class attribute and creates a class and instance writer methods to allow assignment to the attribute.

module Current
  thread_mattr_writer :user
end

Current.user = "DHH"
Thread.current[:attr_Current_user] # => "DHH"

To omit the instance writer method, pass instance_writer: false or instance_accessor: false.

class Current
  thread_mattr_writer :user, instance_writer: false
end

Current.new.user = "DHH" # => NoMethodError

Show source

# File activesupport/lib/active_support/core_ext/module/attribute_accessors_per_thread.rb, line 101
  def thread_mattr_writer(*syms, instance_writer: true, instance_accessor: true) # :nodoc:
    syms.each do |sym|
      raise NameError.new("invalid attribute name: #{sym}") unless /^[_A-Za-z]\w*$/.match?(sym)

      # The following generated method concatenates `object_id` because we want
      # subclasses to maintain independent values.
      class_eval(        def self.#{sym}=(obj)          @__thread_mattr_#{sym} ||= "attr_#{sym}_\#{object_id}"          ::ActiveSupport::IsolatedExecutionState[@__thread_mattr_#{sym}] = obj        end, __FILE__, __LINE__ + 1)

      if instance_writer && instance_accessor
        class_eval(          def #{sym}=(obj)            self.class.#{sym} = obj          end, __FILE__, __LINE__ + 1)
      end
    end
  end

thread_mattr_writer

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