Ruby dup / clone递归 [英] Ruby dup/clone recursively

问题描述

  h = {'name'=> 'sayuj'，
'age'=> 22，
'project'=> {'project_name'=> 'abc'，
'duration'=> 'prq'}} 
  

我需要这个散列的dup，这个改变不应该影响原来的散列。

当我尝试时，

  d = h.dup＃或d = h.clone 
d ['name'] ='sayuj1'
d ['project'] ['duration'] ='xyz'
 
pd＃=> {name=>sayuj1，project=> {duration=>xyz，project_name=>abc}，age=> 22} bph＃=> {name=>sayuj，project=> {duration=>xyz，project_name=>abc}，age=> 22} b  

在这里您可以看到项目['duration'] 因为项目是另一个散列对象。

我希望散列是 duped 或克隆递归。

解决方案

以下是您如何在Ruby中创建深层副本

  d = Marshal.load（Marshal.dump（h））
  

I have a hash like:

h = {'name' => 'sayuj', 
     'age' => 22, 
     'project' => {'project_name' => 'abc', 
                   'duration' => 'prq'}}

I need a dup of this hash, the change should not affect the original hash.

When I try,

d = h.dup # or d = h.clone
d['name'] = 'sayuj1'
d['project']['duration'] = 'xyz'

p d #=> {"name"=>"sayuj1", "project"=>{"duration"=>"xyz", "project_name"=>"abc"}, "age"=>22}
p h #=> {"name"=>"sayuj", "project"=>{"duration"=>"xyz", "project_name"=>"abc"}, "age"=>22}

Here you can see the project['duration'] is changed in the original hash because project is another hash object.

I want the hash to be duped or cloned recursively. How can I achieve this?

解决方案

Here's how you make deep copies in Ruby

d = Marshal.load( Marshal.dump(h) )

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