module Skr::Concerns::AttrAccessorWithDefault::ClassMethods
Public Instance Methods
attr_accessor_with_default( name, default )
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defines a attr_accessor with a default value @param name [ Symbol ] name of the attribute @param default [ Object
, lambda, Proc ] if a value is given, be aware that it will be shared between instances @example
Shared = Struct.new(:str) class AttrTestClass include AttrAccessorWithDefault attr_accessor_with_default :non_copying, ->{ Shared.new("a default string") } attr_accessor_with_default :shared, Shared.new("a default string") end a = AttrTestClass.new b = AttrTestClass.new a.non_copying.str #=> "a default string" a.non_copying.str = "new_string" #=> "new string" b.non_copying.str #=> "a default string" a.shared.str #=> "a default string" b.shared.str #=> "a default string" a.shared.str = "new string" #=> "new string" b.shared.str #=> "new string"
# File lib/skr/concerns/attr_accessor_with_default.rb, line 31 def attr_accessor_with_default( name, default ) attr_writer name attr_reader_with_default( name, default ) end
attr_reader_with_default( name, default )
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# File lib/skr/concerns/attr_accessor_with_default.rb, line 36 def attr_reader_with_default( name, default ) module_eval do define_method( name ) do class << self; self; end.class_eval do attr_reader( name ) end if instance_variables.include? "@#{name}" instance_variable_get( "@#{name}" ) else instance_variable_set( "@#{name}", default.is_a?(Proc) ? default.call : default ) end end end end