Ruby元编程:动态实例变量名称 [英] Ruby Metaprogramming: dynamic instance variable names

问题描述

假设我有以下哈希值:

{ :foo => 'bar', :baz => 'qux' }

如何动态设置键和值以使其成为对象中的实例变量...

How could I dynamically set the keys and values to become instance variables in an object...

class Example
  def initialize( hash )
    ... magic happens here...
  end
end

...这样我就可以在模型中得到以下内容...

... so that I end up with the following inside the model...

@foo = 'bar'
@baz = 'qux'

?

推荐答案

您正在寻找的方法是

The method you are looking for is instance_variable_set. So:

hash.each { |name, value| instance_variable_set(name, value) }

或更简单地说，

hash.each &method(:instance_variable_set)

如果您的实例变量名称缺少"@"(例如在OP的示例中)，则需要添加它们，因此更像是:

If your instance variable names are missing the "@" (as they are in the OP's example), you'll need to add them, so it would be more like:

hash.each { |name, value| instance_variable_set("@#{name}", value) }

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