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体验新版 GitCode,发现更多精彩内容 >>
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a235b9f9
编写于
11月 01, 2017
作者:
X
Xavier Noria
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updates autoloading guide for Ruby 2.5 [ci skip]
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guides/source/autoloading_and_reloading_constants.md
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guides/source/autoloading_and_reloading_constants.md
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@@ -330,11 +330,17 @@ its resolution next. Let's define *parent* to be that qualifying class or module
object, that is,
`Billing`
in the example above. The algorithm for qualified
constants goes like this:
1.
The constant is looked up in the parent and its ancestors.
1.
The constant is looked up in the parent and its ancestors. In Ruby >= 2.5,
`Object`
is skipped if present among the ancestors.
`Kernel`
and
`BasicObject`
are still checked though.
2.
If the lookup fails,
`const_missing`
is invoked in the parent. The default
implementation of
`const_missing`
raises
`NameError`
, but it can be overridden.
INFO. In Ruby < 2.5
`String::Hash`
evaluates to
`Hash`
and the interpreter
issues a warning: "toplevel constant Hash referenced by String::Hash". Starting
with 2.5,
`String::Hash`
raises
`NameError`
because
`Object`
is skipped.
As you see, this algorithm is simpler than the one for relative constants. In
particular, the nesting plays no role here, and modules are not special-cased,
if neither they nor their ancestors have the constants,
`Object`
is
**not**
...
...
@@ -1178,6 +1184,8 @@ end
#### Qualified References
WARNING. This gotcha is only possible in Ruby < 2.5.
Given
```
ruby
...
...
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