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#4894 ✓resolved
Paul Gillard

Record Cloning Not Shallow

Reported by Paul Gillard | June 17th, 2010 @ 11:57 PM | in 3.0.2


Cloned Active Record objects receive the original object's associations.


Roughly speaking Ruby clones objects by copying instance variables into a new object. Before #3164 Active Record implemented cloning by defining its own #clone method. This method only copied instance variables that were wanted. Since #3164 Ruby's in-built #initialize_copy gets called and this copies all instance variables. This means that associations are incorrectly copied (as they are stored within records as instance variables).

The Active Record documentation for #initialize_copy states:

Note that this is a "shallow" clone as it copies the object's attributes only, not its associations.

However this is no longer the case.

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