Ruby中数组的深拷贝 [英] Deep copy of arrays in Ruby

问题描述

我想在生产中获取一个对象，并对另一个相同类型的对象进行精确复制(复制其内容).我尝试从 ruby​​ 控制台以 3 种方式执行此操作，但均未奏效:

I wanted to get an object on production and do an exact replica( copy over its contents) to another object of same type. I tried doing this in 3 ways from ruby console which none of them worked:

1. 假设您将 tt 作为要复制的第一个对象，将 tt2 作为副本对象.我尝试的第一种方法是克隆数组

1. Let's say you have the tt as the first object you want to copy over and tt2 as the replica object. The first approach I tried is cloning the array

tt2.patients  = tt.urls.patients
tt2.doctors   = tt.segments.doctors
tt2.hospitals = tt.pixels.hospitals

我尝试的第二种方法是复制数组，实际上与克隆数组相同:

Second approach I tried is duplicating the array which is actually the same as cloning the array:

tt2.patients  = tt.patients.dup
tt2.doctors   = tt.doctors.dup
tt2.hospitals = tt.hospitals.dup

我尝试的第三种方法是编组.

Third approach I tried is marhsalling.

tt2.patients  = Marshal.load(Marshal.dump(tt.patients)) 
tt2.doctors   = Marshal.load(Marshal.dump(tt.doctors)) 
tt2.hospitals = Marshal.load(Marshal.dump(tt.hospitals)) 

以上都不适用于从一个数组到另一个数组的深度复制.在单独尝试了上述每种方法后，第一个对象 (tt) 的所有内容都无效(患者、医生和医院都消失了).您对将一个对象的内容复制到另一个对象有任何其他想法吗?谢谢.

None of the above works for deep copying from one array to another. After trying out each approach individually above, all the contents of the first object (tt) are nullified (patients, doctors and hospitals are gone). Do you have any other ideas on copying the contents of one object to another? Thanks.

推荐答案

简单！

@new_tt            = tt2.clone
@new_tt.patients   = tt2.patients.dup
@new_tt.doctors    = tt2.doctors.dup
@new_tt.hospitals  = tt2.hospitals.dup
@new_tt.save

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