[#42344] [ruby-trunk - Feature #5964][Open] Make Symbols an Alternate Syntax for Strings — Tom Wardrop <tom@...>

23 messages 2012/02/03

[#42443] [ruby-trunk - Bug #5985][Open] miniruby skews "make benchmark" results — Eric Wong <normalperson@...>

21 messages 2012/02/08

[#42444] [ruby-trunk - Bug #5986][Open] Segmentation Fault — Luis Matta <levmatta@...>

16 messages 2012/02/08

[#42471] [ruby-trunk - Feature #5995][Open] calling io_advise_internal() in read_all() — Masaki Matsushita <glass.saga@...>

20 messages 2012/02/10

[#42560] [ruby-trunk - Bug #6011][Open] ruby-1.9.3-p0/lib/webrick/utils.rb:184: [BUG] Segmentation fault — Vit Ondruch <v.ondruch@...>

12 messages 2012/02/13

[#42579] [ruby-trunk - Bug #6012][Open] Proc#source_location also return the column — Roger Pack <rogerpack2005@...>

14 messages 2012/02/14

[#42685] [ruby-trunk - Bug #6036][Open] Test failures in Fedora Rawhide/17 — Bohuslav Kabrda <bkabrda@...>

14 messages 2012/02/16

[#42697] [ruby-trunk - Bug #6040][Open] Transcoding test failure: Big5 to UTF8 not defined (MinGW) — Luis Lavena <luislavena@...>

10 messages 2012/02/16

[#42813] [ruby-trunk - Feature #6065][Open] Allow Bignum marshalling/unmarshalling from C API — Martin Bosslet <Martin.Bosslet@...>

22 messages 2012/02/23

[#42815] [ruby-trunk - Bug #6066][Open] Fix "control may reach end of non-void function" warnings for clang — Eric Hodel <[email protected]>

15 messages 2012/02/23

[#42857] [ruby-trunk - Feature #6074][Open] Allow alias arguments to have a comma — Thomas Sawyer <transfire@...>

20 messages 2012/02/24

[#42891] [ruby-trunk - Feature #6083][Open] Hide a Bignum definition — Koichi Sasada <redmine@...>

23 messages 2012/02/25

[#42906] [ruby-trunk - Bug #6085][Open] Treatment of Wrong Number of Arguments — Marc-Andre Lafortune <ruby-core@...>

14 messages 2012/02/25

[#42949] [ruby-trunk - Bug #6089][Open] Test suite fails with OpenSSL 1.0.1 — Vit Ondruch <v.ondruch@...>

13 messages 2012/02/26

[ruby-core:42745] [ruby-trunk - Feature #2740] Extend const_missing to pass in the nesting

From: Aaron Patterson <aaron@...>
Date: 2012-02-19 20:22:42 UTC
List: ruby-core #42745
Issue #2740 has been updated by Aaron Patterson.


Bump
----------------------------------------
Feature #2740: Extend const_missing to pass in the nesting
https://bugs.ruby-lang.org/issues/2740

Author: Yehuda Katz
Status: Assigned
Priority: Normal
Assignee: Yukihiro Matsumoto
Category: core
Target version: 2.0.0
ruby -v: ruby 1.8.7 (2008-08-11 patchlevel 72) [universal-darwin10.0] 


=begin
 At the moment, it is impossible for const_missing to differentiate between these cases:
 
     class Foo::Bar
       Baz
     end
  
     class Foo
       class Bar
         Baz
       end
     end
 
 In Rails, we implement a class loading system that loads classes from the file system if they are not found. In the above case, Foo::Baz might be stored in app/models/foo/baz.rb. We would like to be able to use the same Ruby constant lookup logic when looking up classes from the file system.
 
     class Foo::Bar
       Baz
     end
 
 Here, we should look in "app/models/foo/bar/baz.rb" and in "app/models/baz.rb" just as Ruby would search for Foo::Bar::Baz and then Object::Baz.
 
     class Foo
       class Bar
         Baz
       end
     end
 
 Here, we should look in "app/models/foo/bar/baz.rb", then "app/models/foo/baz.rb", and finally "app/models/baz.rb" just as Ruby would search for Foo::Bar::Baz, then Foo::Baz, and then Object::Baz.
 
 In order to achieve this, I propose that we extend the const_missing method to take an optional second parameter containing the nesting:
 
     class Foo
       class Bar
         def self.const_missing(id, nesting)
           id == :Baz
           nesting == [Foo::Bar] # first case
           nesting == [Foo::Bar, Foo] # second case
         end
       end
     end
 
 This would allow people who wish to do their own custom constant loading (such as Rails) to do so in a way that is consistent with Ruby's own constant lookup. In order to avoid backward-compatibility issues, we can check the arity of the const_missing method, and only pass in the nesting if a second parameter was provided.
=end



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