Auto Generated Values Attributes

Question

Ammar S. Mitoori OP

Created Apr ’20

Replies 2

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Participants 3

Hi

suppose I want an attribute to hold a unique number auto generated for each record in an entity in core Data, is there something out of the box in core Data to use ?

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Kindest Regards

Answered by Claude31 in 416443022

A simple way would be to store in the record the duration converted in milliseconds from a start date.

That would surely be unique. And directly in sequential order if you need.

But if you fear simultaneous update at the same millisecond (highly improbable), add 3 digits number built from a unique record. Then risk is virtually zero.

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Answer 1

Claude31 OP

Apr ’20

Accepted Answer

A simple way would be to store in the record the duration converted in milliseconds from a start date.

That would surely be unique. And directly in sequential order if you need.

But if you fear simultaneous update at the same millisecond (highly improbable), add 3 digits number built from a unique record. Then risk is virtually zero.

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Answer 2

PBK OP

Apr ’20

In the world of 'unique' there is NSUUID. The problem of uniqueness is that if you have N selections, in order to assure uniqueness you need a number of order N*N.

https://developer.apple.com/documentation/foundation/nsuuid?language=objc

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