Grails hasMany: when child is updated, parent's version changes

Question

I am using Grails and am quite surprised by the way hasMany relationships work. I have a typical hasMany relationship where the parent id is in the child table. When I insert a child and try to save it through the parent object, the parent object's version id gets incremented. My question is: Why should the parent's version id change when there is a change only in the child object?

class Parent { static hasMany = [children: child] } class child { string name Parent parent static belongsTo = [Parent] } def p = Parent.get(1) p.addToChildren(new Child(name: "Roy")) p.save()

The version of p gets incremented from 0 to 1. Is there any way I can avoid this in Grails?

Due to the change in version ID of the parent I get a stale object exception. Any help?

In my mind, the Parent object has changed, because it got a new child. My 2c worth — sbglasius
– sbglasius, Commented Sep 13, 2010 at 9:07
Soren is correct - a property has changed (analagous to adding one char to a String property) so the whole object is considered changed. This is a Hibernate thing and not a Grails thing. — Burt Beckwith
– Burt Beckwith, Commented Sep 13, 2010 at 13:44

Community · Accepted Answer · 2020-06-20 09:12:55Z

2

One possibility is to disable optimistic locking for your domain object.

Update

Or try to search.

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Sep 13, 2010 at 8:50

amra

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1 Comment

prabha Over a year ago

is there an other solution? I need to have a version id column in the table

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