Grails: randomized auto identifier

Question

When setting rails by default while saving the first domain object, it gives a fantastic randomized identifier like 785787634 or something like that. Graales gives 1 .

What is the preferred method for creating hard-to-reach and unlikely to intersect automatically generated identifiers in the grail?

Answer 1

Grails allows you to configure the id generator. see http://grails.org/doc/latest/guide/GORM.html#identity

In your case, you might consider "uuid" or "guid"

Answer 2

Another way to do this is to use the default identifiers as indicated, but then add the highlighted column using the UUID when you need open (insecure) access to the element.

I think this will work very well:

 class Widget { String uuid static constraints = { uuid unique: true } def beforeInsert() { // optionally, replace the dashes by adding .replaceAll('-','') uuid = UUID.randomUUID().toString() } } 

Then you can use a controller like this:

 // url: app/public/widget/48b5451a-0d21-4a36-bcc0-88b129852f1b PublicController { def widget() { Widget w = Widget.findByUuid(params.id) ... } } 

This is indexed automatically, so it is not too slow, and the UUID is only used when viewing the widget publicly. If you are logged in, you can perform security checks and just use app/widget/edit/1 or something similar.

I would not rely on a "random number" as a safe means. Guessing numbers work even if the numbers are not sequential. It is almost impossible to guess the UUID, comparatively. However, if you have login accounts, authorization checks are best.