Sha256: 18a2d98bb43991e413548748daf41e68d18b4ec60d2dd846141837306b847084
Contents?: true
Size: 1.03 KB
Versions: 45
Compression:
Stored size: 1.03 KB
Contents
class Module
# Declare an attribute accessor with an initial default return value.
#
# To give attribute <tt>:age</tt> the initial value <tt>25</tt>:
#
# class Person
# attr_accessor_with_default :age, 25
# end
#
# some_person.age
# => 25
# some_person.age = 26
# some_person.age
# => 26
#
# To give attribute <tt>:element_name</tt> a dynamic default value, evaluated
# in scope of self:
#
# attr_accessor_with_default(:element_name) { name.underscore }
#
def attr_accessor_with_default(sym, default = nil, &block)
raise 'Default value or block required' unless !default.nil? || block
define_method(sym, block_given? ? block : Proc.new { default })
module_eval(<<-EVAL, __FILE__, __LINE__)
def #{sym}=(value) # def age=(value)
class << self; attr_reader :#{sym} end # class << self; attr_reader :age end
@#{sym} = value # @age = value
end # end
EVAL
end
end
Version data entries
45 entries across 44 versions & 11 rubygems