如何在Ruby on Rails中以编程方式找到名称空间/模块名称? [英] How do you find the namespace/module name programmatically in Ruby on Rails?

问题描述

如何在下面的过滤器中找到名称空间或模块"Foo"的名称?

How do I find the name of the namespace or module 'Foo' in the filter below?

class ApplicationController < ActionController::Base
  def get_module_name
    @module_name = ???
  end
end


class Foo::BarController < ApplicationController
  before_filter :get_module_name
end

推荐答案

这些解决方案均未考虑具有多个父模块的常量.例如:

None of these solutions consider a constant with multiple parent modules. For instance:

A::B::C

从Rails 3.2.x开始，您可以简单地:

As of Rails 3.2.x you can simply:

"A::B::C".deconstantize #=> "A::B"

从Rails 3.1.x开始，您可以:

As of Rails 3.1.x you can:

constant_name = "A::B::C"
constant_name.gsub( "::#{constant_name.demodulize}", '' )

这是因为#demodulize与#deconstantize相反:

This is because #demodulize is the opposite of #deconstantize:

"A::B::C".demodulize #=> "C"

如果您确实需要手动执行此操作，请尝试以下操作:

If you really need to do this manually, try this:

constant_name = "A::B::C"
constant_name.split( '::' )[0,constant_name.split( '::' ).length-1]

这篇关于如何在Ruby on Rails中以编程方式找到名称空间/模块名称?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！