removeFrom* not working and with no errors - grails

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 throw any exception etc.
How can I track down why??
I've attached a sample application that adds some data via BootStrap.groovy.
Just run it - you can view the data via the default scaffold views.
If you run linux, from a command line you can run the following
GET "http://localhost:8080/gespm/JSONNote/deleteItem?job.id=1&note.id=2"
You can run it over and over again and nothing different happens. You could also paste the URL into your webbrowser if you're running windows.
Please help - I'm stuck!!!
Code is here link text
Note Domain
package beachit
class Note
{
Date dateCreated
Date lastUpdated
String note
static belongsTo = Job
static constraints =
{
}
String toString()
{
return note
}
}
Job Domain
package beachit
class Job
{
Date dateCreated
Date lastUpdated
Date createDate
Date startDate
Date completionDate
List notes
static hasMany = [notes : Note]
static constraints =
{
}
String toString()
{
return createDate.toString() + " " + startDate.toString();
}
}
JSONNoteController
package beachit
import grails.converters.*
import java.text.*
class JSONNoteController
{
def test = { render "foobar test" }
def index = { redirect(action:listAll,params:params) }
// the delete, save and update actions only accept POST requests
//static allowedMethods = [delete:'POST', save:'POST', update:'POST']
def getListService =
{
def message
def status
def all = Note.list()
return all
}
def getListByJobService(jobId)
{
def message
def status
def jobInstance = Job.get(jobId)
def all
if(jobInstance)
{
all = jobInstance.notes
}
else
{
log.debug("getListByJobService job not found for jobId " + jobId)
}
return all
}
def listAll =
{
def message
def status
def listView
listView = getListService()
message = "Done"
status = 0
def response = ['message': message, 'status':status, 'list': listView]
render response as JSON
}
def deleteItem =
{
def jobInstance
def noteInstance
def message
def status
def jobId = 0
def noteId = 0
def instance
def listView
def response
try
{
jobId = Integer.parseInt(params.job?.id)
}
catch (NumberFormatException ex)
{
log.debug("deleteItem error in jobId " + params.job?.id)
log.debug(ex.getMessage())
}
if (jobId && jobId > 0 )
{
jobInstance = Job.get(jobId)
if(jobInstance)
{
if (jobInstance.notes)
{
try
{
noteId = Integer.parseInt(params.note?.id)
}
catch (NumberFormatException ex)
{
log.debug("deleteItem error in noteId " + params.note?.id)
log.debug(ex.getMessage())
}
log.debug("note id =" + params.note.id)
if (noteId && noteId > 0 )
{
noteInstance = Note.get(noteId)
if (noteInstance)
{
try
{
jobInstance.removeFromNotes(noteInstance).save()
noteInstance.delete()
message = "note ${noteId} deleted"
status = 0
}
catch(org.springframework.dao.DataIntegrityViolationException e)
{
message = "Note ${noteId} could not be deleted - references to it exist"
status = 1
}
/*
catch(Exception e)
{
message = "Some New Error!!!"
status = 10
}
*/
}
else
{
message = "Note not found with id ${noteId}"
status = 2
}
}
else
{
message = "Couldn't recognise Note id : ${params.note?.id}"
status = 3
}
}
else
{
message = "No Notes found for Job : ${jobId}"
status = 4
}
}
else
{
message = "Job not found with id ${jobId}"
status = 5
}
listView = getListByJobService(jobId)
} // if (jobId)
else
{
message = "Couldn't recognise Job id : ${params.job?.id}"
status = 6
}
response = ['message': message, 'status':status, 'list' : listView]
render response as JSON
} // deleteNote
}

Answer 1

I got it working... though I cannot explain why.
I replaced the following line in deleteItem
noteInstance = Note.get(noteId)
with the following
noteInstance = jobInstance.notes.find { it.id == noteId }
For some reason the jobInstance.removeFromNotes works with the object returned by that method instead of .get
What makes it stranger is that all other gorm functions (not sure about the dynamic ones actually) work against the noteInstance.get(noteId) method.
At least it's working though!!

Answer 2

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.

Answer 3

I just had this same issue come up. The removeFrom function succeeded, the save succeeded but the physical record in the database wasn't deleted. Here's what worked for me:
class BasicProfile {
static hasMany = [
post:Post
]
}
class Post {
static belongsTo = [basicProfile:BasicProfile]
}
class BasicProfileController {
...
def someFunction
...
BasicProfile profile = BasicProfile.findByUser(user)
Post post = profile.post?.find{it.postType == command.postType && it.postStatus == command.postStatus}
if (post) {
profile.removeFromPost(post)
post.delete()
}
profile.save()
}
So it was the combination of the removeFrom, followed by a delete on the associated domain, and then a save on the domain object.