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Groups > comp.lang.ruby > #3010
| From | Kevin Mahler <kevin.mahler@yahoo.com> |
|---|---|
| Newsgroups | comp.lang.ruby |
| Subject | Re: What do you do when you need to attach data to an object instance? |
| Date | 2011-04-16 10:32 -0500 |
| Organization | Service de news de lacave.net |
| Message-ID | <41c1bcee810455547ca7d7844c1113d2@ruby-forum.com> (permalink) |
| References | (1 earlier) <6fce5b6386258c51794d0b55b63e1ed6@ruby-forum.com> <BANLkTi=ih21apYDBBBgDpVkfJcRXR6CmJg@mail.gmail.com> <BANLkTinGsu4_yM51dETQBgrN4c4enz1FaA@mail.gmail.com> <ebf5e68c050f1d14ab1e4188d6d392c2@ruby-forum.com> <d96516e82c6c2b2d395098f86cf62bc2@ruby-forum.com> |
7stud -- wrote in post #993115:
> Kevin Mahler wrote in post #992907:
>>
>> def extend_accessor(obj, name)
>> obj.singleton_class.module_eval { attr_accessor name }
>> obj
>> end
>>
>
> Hey, now. obj.singleton_class is a class, so how about using the
> synonym class_eval():
>
> obj.singleton_class.class_eval { attr_accessor name }
A class is a module, but a module is not a class.
Class.new.is_a? Module #=>true
Module.new.is_a? Class #=>false
Because module_eval and class_eval are aliases, class_eval can be
called on a module, a situation which is at worst wrong and at best
confusing. module_eval can never be wrong or confusing. Not a hard
choice.
--
Posted via http://www.ruby-forum.com/.
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What do you do when you need to attach data to an object instance? "Aaron D. Gifford" <astounding@gmail.com> - 2011-04-14 14:47 -0500
Re: What do you do when you need to attach data to an object instance? Kevin Mahler <kevin.mahler@yahoo.com> - 2011-04-14 16:11 -0500
Re: What do you do when you need to attach data to an object instance? "Aaron D. Gifford" <astounding@gmail.com> - 2011-04-14 17:33 -0500
Re: What do you do when you need to attach data to an object instance? "Aaron D. Gifford" <astounding@gmail.com> - 2011-04-14 18:45 -0500
Re: What do you do when you need to attach data to an object instance? 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-14 19:50 -0500
Re: What do you do when you need to attach data to an object instance? Kevin Mahler <kevin.mahler@yahoo.com> - 2011-04-14 20:07 -0500
Re: What do you do when you need to attach data to an object instance? "Aaron D. Gifford" <astounding@gmail.com> - 2011-04-15 01:35 -0500
Re: What do you do when you need to attach data to an object instance? Robert Klemme <shortcutter@googlemail.com> - 2011-04-15 03:46 -0500
Re: What do you do when you need to attach data to an object instance? 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-15 13:40 -0500
Re: What do you do when you need to attach data to an object instance? Robert Klemme <shortcutter@googlemail.com> - 2011-04-15 21:00 +0200
Re: What do you do when you need to attach data to an object instance? 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-15 18:10 -0500
Re: What do you do when you need to attach data to an object instance? Kevin Mahler <kevin.mahler@yahoo.com> - 2011-04-16 10:32 -0500
Re: What do you do when you need to attach data to an object instance? 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-16 12:14 -0500
Re: What do you do when you need to attach data to an object instance? Kevin Mahler <kevin.mahler@yahoo.com> - 2011-04-16 12:53 -0500
Re: What do you do when you need to attach data to an object instance? Adam Prescott <adam@aprescott.com> - 2011-04-18 07:10 -0500
Re: What do you do when you need to attach data to an object instance? 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-14 18:15 -0500
Re: What do you do when you need to attach data to an object instance? 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-14 19:01 -0500
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