method

thread_mattr_writer

v5.1.7 - Show latest stable - Class: Module

thread_mattr_writer(*syms)

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"

If you want to opt out of the creation of 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

# File activesupport/lib/active_support/core_ext/module/attribute_accessors_per_thread.rb, line 80
  def thread_mattr_writer(*syms) # :nodoc:
    options = syms.extract_options!
    syms.each do |sym|
      raise NameError.new("invalid attribute name: #{sym}") unless /^[_A-Za-z]\w*$/.match?(sym)

      # The following generated method concatenates `name` because we want it
      # to work with inheritance via polymorphism.
      class_eval(        def self.#{sym}=(obj)          Thread.current["attr_" + name + "_#{sym}"] = obj        end, __FILE__, __LINE__ + 1)

      unless options[:instance_writer] == false || options[:instance_accessor] == false
        class_eval(          def #{sym}=(obj)            self.class.#{sym} = obj          end, __FILE__, __LINE__ + 1)
      end
    end
  end

thread_mattr_writer

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