From: Yehuda Katz <wycats@...>
Date: 2011-11-30T16:52:36+09:00
Subject: [ruby-core:41408] Re: [ruby-trunk - Bug #5690][Open] Module#qualified_const_get

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Yehuda Katz
(ph) 718.877.1325


On Tue, Nov 29, 2011 at 10:04 PM, Yukihiro Matsumoto <matz@ruby-lang.org>wr=
ote:

> Hi,
>
> In message "Re: [ruby-core:41404] [ruby-trunk - Bug #5690][Open]
> Module#qualified_const_get"
>     on Wed, 30 Nov 2011 12:10:02 +0900, Yehuda Katz <wycats@gmail.com>
> writes:
>
> |It would be great if there was a way to dynamically load a constant path=
:
> |
> |  module Foo
> |    module Bar
> |      module Baz
> |      end
> |    end
> |  end
> |
> |  Foo.qualified_const_get("Bar::Baz") =3D> Foo::Bar::Baz
>
> Interesting.
>
> * is there any use-case for this method?
>

We use it often in Rails.


> * if Bar is not a class nor module, what kind error should be raised?
>

TypeError: "(=85) is not a class/module"


> * is qualified_const_get an appropriate name for the function?
>

Unknown. It's what we call it in Rails ;)


>
>                                                        matz.
>
>

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<br clear=3D"all">Yehuda Katz<br>(ph) 718.877.1325<br>
<br><br><div class=3D"gmail_quote">On Tue, Nov 29, 2011 at 10:04 PM, Yukihi=
ro Matsumoto <span dir=3D"ltr">&lt;<a href=3D"mailto:matz@ruby-lang.org">ma=
tz@ruby-lang.org</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote"=
 style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">

Hi,<br>
<br>
In message &quot;Re: [ruby-core:41404] [ruby-trunk - Bug #5690][Open] Modul=
e#qualified_const_get&quot;<br>
<div class=3D"im"> =A0 =A0on Wed, 30 Nov 2011 12:10:02 +0900, Yehuda Katz &=
lt;<a href=3D"mailto:wycats@gmail.com">wycats@gmail.com</a>&gt; writes:<br>
<br>
|It would be great if there was a way to dynamically load a constant path:<=
br>
|<br>
| =A0module Foo<br>
| =A0 =A0module Bar<br>
| =A0 =A0 =A0module Baz<br>
| =A0 =A0 =A0end<br>
| =A0 =A0end<br>
| =A0end<br>
|<br>
| =A0Foo.qualified_const_get(&quot;Bar::Baz&quot;) =3D&gt; Foo::Bar::Baz<br=
>
<br>
</div>Interesting.<br>
<br>
* is there any use-case for this method?<br></blockquote><div><br></div><di=
v>We use it often in Rails.</div><div>=A0</div><blockquote class=3D"gmail_q=
uote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1e=
x;">


* if Bar is not a class nor module, what kind error should be raised?<br></=
blockquote><div><br></div><div>TypeError: &quot;(=85) is not a class/module=
&quot;</div><div>=A0</div><blockquote class=3D"gmail_quote" style=3D"margin=
:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">


* is qualified_const_get an appropriate name for the function?<br></blockqu=
ote><div><br></div><div>Unknown. It&#39;s what we call it in Rails ;)</div>=
<div>=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;=
border-left:1px #ccc solid;padding-left:1ex;">


<br>
 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0matz.<br>
<br>
</blockquote></div><br>

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