Get the mapping between old and new object after deep clone

[superrordev]

Hello.

I am trying to get the mapping between old and new object after deep clone. For example: author 1 has many books:

• Author <Author id: 1, name: 'author 1'>

• Book <Book id: 1, name: 'book 1', author_id: 1> <Book id: 2, name: 'book 2', author_id: 1> <Book id: 3, name: 'book 3', author_id: 1>

• Cloning dup_author = author.deep_clone include: [:books] dup_author.save!

• Result

• Author <Author id: 2, name: 'author 1'>

• Book <Book id: 4, name: 'book 1', author_id: 2> <Book id: 5, name: 'book 2', author_id: 2> <Book id: 6, name: 'book 3', author_id: 2>

I want mapping hash between old books and new books of duplicated author. mapping = { 1: 4, 2: 5, 3: 6}

How can I get this mapping hash using deep_clone?

Please help me.

[moiristo]

Hello,

I think you can achieve this by enabling the dictionary with a custom hash (see docs). Something like:

dictionary = {}
dup_author = author.deep_clone include: [:books], dictionary: dictionary
dup_author.save!
pp dictionary

[superrordev]

Sorry. This is the output: {:books=>{#<Book id: 1, name: 'book 1'>=>#<Book id: nil, name: 'book 1'>, #<Book id: 2, name: 'book 2'>=>#<Book id: nil, name: 'book 2'>, #<Book id: 3, name: 'book 3'>=>#<Book id: nil, name: 'book 3'>}}

The ids of duplicated objects are nil.

Is there anyway to get the id of duplicated object?

[superrordev]

I'm so sorry. The above was the output before saving. It is showing the mapping between old and new objects.

Yes, it is possible to get ids through that way.

Thank you.