创建对象

Question

PHP

<?php 
$dynamicProperties = array("name" => "bob", "phone" => "555-1212"); 
$myObject = new stdClass(); 
foreach($dynamicProperties as $key => $value) { 
    $myObject->$key = $value; 
} 
echo $myObject->name . "<br />" . $myObject->phone; 
?> 

如何在Ruby中做到这一点？

Answer 1

如果你想要做一个“动态”的正式上课，用Struct：

>> Person = Struct.new(:name, :phone) 
=> Person 
>> bob = Person.new("bob", "555-1212") 
=> #<struct Person name="bob", phone="555-1212"> 
>> bob.name 
=> "bob" 
>> bob.phone 
=> "555-1212" 

若要使对象完全从哈希上的飞，使用OpenStruct：

>> require 'ostruct' 
=> true 
>> bob = OpenStruct.new({ :name => "bob", :phone => "555-1212" }) 
=> #<OpenStruct phone="555-1212", name="bob"> 
>> bob.name 
=> "bob" 
>> bob.phone 
=> "555-1212" 

Answer 2

其中一种方法是使用class_eval,define_method等来动态构建一个类：

dynamic_properties = { 
    'name' => 'bob', 
    'phone' => '555-1212' 
} 

class_instance = Object.const_set('MyClass', Class.new) 
class_instance.class_eval do 
    define_method(:initialize) do 
    dynamic_properties.each do |key, value| 
     instance_variable_set("@#{key}", value); 
    end 
    end 

    dynamic_properties.each do |key, value| 
    attr_accessor key 
    end 
end 

然后，您可以稍后消耗该类如下：

>> my_object = MyClass.new 
>> puts my_object.name 
=> 'bob' 
>> puts my_object.phone 
=> '555-1212' 

但它不会是红宝石，如果只有一个做到这一点的方式！

Answer 3

使用OpenStruct：

require 'ostruct' 

data = { :name => "bob", :phone => "555-1212" } 
my_object = OpenStruct.new(data) 

my_object.name #=> "bob" 
my_object.phone #=> "555-1212"