模塊/命名空間

Question

在運行時創建類作爲進行中在運行時創建一個類如下：

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" 

現在，讓我們說，你有一個模塊公司名稱：

module Company 
end 

如何創建Employee類公司模塊/名稱空間內的運行時處的s ，以便產生相同的結果？

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

Answer 1

比你想象:)

Company.const_set "Employee", klass 

當你Object設置一些輕鬆，它成爲全球性，因爲，一切是Object。但是你可以爲每個課程/模塊做const_set。請記住，模塊/類只是常數。所以，Company::Employee是一個常數Employee在常數Company。這很簡單:)

全碼：

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

您已經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]