method

extlib_inheritable_writer

v3.0.0 - Show latest stable - 0 notes - Class: Class

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What's this?

extlib_inheritable_writer(*ivars) public

Defines class-level inheritable attribute writer. Attributes are available to subclasses, each subclass has a copy of parent’s attribute.

@param *syms<Array[*#to_s, Hash{:instance_writer => Boolean}]> Array of attributes to

  define inheritable writer for.

@option syms :instance_writer<Boolean> if true, instance-level inheritable attribute writer is defined. @return <Array[#to_s]> An Array of the attributes that were made into inheritable writers.

@api public

@todo We need a style for class_eval <<-HEREDOC. I’d like to make it

  class_eval(<<-RUBY, __FILE__, __LINE__), but we should codify it somewhere.

Show source

# File activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb, line 228
  def extlib_inheritable_writer(*ivars)
    options = ivars.extract_options!

    ivars.each do |ivar|
      self.class_eval "def self.\#{ivar}=(obj)\n@\#{ivar} = obj\nend\n", __FILE__, __LINE__ + 1
      unless options[:instance_writer] == false
        self.class_eval "def \#{ivar}=(obj) self.class.\#{ivar} = obj end\n", __FILE__, __LINE__ + 1
      end

      self.send("#{ivar}=", yield) if block_given?
    end
  end

extlib_inheritable_writer

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