模块/命名空间

Question

在运行时创建类作为进行中在运行时创建一个类如下：

klass = Class.new superclass, &block 
Object.const_set class_name, klass 

例子：

class Person 
    def name 
    "Jon" 
    end 
end 

klass = Class.new Person do 
    def name 
    "#{super} Doe" 
    end 
end 

Object.const_set "Employee", klass 

puts Employee.new.name # prints "Jon Doe" 

现在，让我们说，你有一个模块公司名称：

module Company 
end 

如何创建Employee类公司模块/名称空间内的运行时处的s ，以便产生相同的结果？

puts Company::Employee.new.name # prints "Jon Doe" 

Answer 1

比你想象:)

Company.const_set "Employee", klass 

当你Object设置一些轻松，它成为全球性，因为，一切是Object。但是你可以为每个课程/模块做const_set。请记住，模块/类只是常数。所以，Company::Employee是一个常数Employee在常数Company。这很简单:)

全码：

class Person 
    def name 
    "Jon" 
    end 
end 

klass = Class.new Person do 
    def name 
    "#{super} Doe" 
    end 
end 

module Company 
end 

Company.const_set "Employee", klass 

Company::Employee.new.name # => "Jon Doe" 

Answer 2

您已经有了所有必要的片段：

class Person 
    def name 
    "Jon" 
    end 
end 

klass = Class.new Person do 
    def name 
    "#{super} Doe" 
    end 
end 

module Company 
end 

Company.const_set "Employee", klass 

puts Company::Employee.new.name # prints "Jon Doe" 

Company.constants.grep(/Emp/) 
#=> [:Employee]