removeFrom* not working and with no errors

Question

I have what I think is a simple problem but have been unable to solve... For some reason I have a controller that uses removeFrom*.save() which throws no errors but does not do anything. Running Grails 1.2 Linux/Ubuntu The following application is stripped down to reproduce the problem... I have two domain objects via create-domain-class - Job (which has many notes) - Note (which belongs to Job) I have 3 controllers via create-controller - JobController (running scaffold) - NoteController (running scaffold) - JSONNoteController JSONNoteController has one primary method deleteItem which aims to remove/delete a note. It does the following - some request validation - removes the note from the job - jobInstance.removeFromNotes(noteInstance).save() - deletes the note - noteInstance.delete() - return a status and remaining data set as a json response. When I run this request - I get no errors but it appears that jobInstance.removeFromNotes(noteInstance).save() does nothing and does not thro…

Accepted Answer

See this thread: http://grails.1312388.n4.nabble.com/GORM-doesn-t-inject-hashCode-and-equals-td1370512.html

I would recommend using a base class for your domain objects like this:

```
abstract class BaseDomain {

@Override
    boolean equals(o) {
        if(this.is(o)) return true
        if(o == null) return false
        // hibernate creates dynamic subclasses, so 
        // checking o.class == class would fail most of the time
        if(!o.getClass().isAssignableFrom(getClass()) && 
            !getClass().isAssignableFrom(o.getClass())) return false

if(ident() != null) {
            ident() == o.ident()
        } else {
            false
        }
    }

@Override
    int hashCode() {
        ident()?.hashCode() ?: 0
    }

}
```

That way, any two objects with the same non-null database id will be considered equal.

removeFrom* not working and with no errors

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