Hi Ted,
There's no validation exception handling on the list pages. To work around
this, you can implement something like this on the EO:
@Override
public boolean canDelete() {
boolean canDelete = super.canDelete();
if (studentCount() > 0) {
canDelete = false;
} else if
(ERXEOControlUtilities.objectCountWithQualifier(editingContext(),
Course.ENTITY_NAME, Course.PREVIOUS_COURSE.eq(this)) > 0) {
canDelete = false;
}
return canDelete;
}
If the method returns false, the button will be deactivated. Still, the user
has no way of knowing why the object cannot be deleted…
Fabian
> Am 15.02.2019 um 18:43 schrieb Theodore Petrosky <tedp...@yahoo.com>:
>
> I have a small d2w project.
>
> Person has a to-many relationship to DocuentScan. In my Person entity I see
> the documentScans relation. I set the Delete Rule to deny. So if I try to
> delete a person, and there are Document Scans attached, the transaction will
> be aborted and there will be an error message.
>
> OK, so user ‘Ted' has some documentScans attached. I click to delete the user
> and I get the normal confirmation box. I click the delete to confirm and
> instead of returning me to the previous screen with a warning, I get an error
> in Eclipse. here is the top few lines:
>
> WARN NSLog - <er.ajax.AjaxRequestHandler>: Exception occurred while
> handling request:
> <er.extensions.validation.ERXValidationException object: <com.as.Model.Person
> pk:"1">; propertyKey: documentScans; type: ObjectsRemovalException;
> additionalExceptions: ()>
> [2019-2-15 12:21:5 EST] <WorkerThread7>
> <er.extensions.validation.ERXValidationException object: <com.as.Model.Person
> pk:"1">; propertyKey: documentScans; type: ObjectsRemovalException;
> additionalExceptions: ()>
> at
> com.webobjects.eoaccess.EOEntity.validateObjectForDelete(EOEntity.java:4190)
> at
> com.webobjects.eoaccess.EOEntityClassDescription.validateObjectForDelete(EOEntityClassDescription.java:521)
> at
> er.extensions.eof.ERXEntityClassDescription.validateObjectForDelete(ERXEntityClassDescription.java:700)
> at
> com.webobjects.eocontrol.EOCustomObject.validateForDelete(EOCustomObject.java:1419)
> at
> com.webobjects.eocontrol.EOEditingContext.validateTable(EOEditingContext.java:2274)
>
> and this is the top of my browswer:
>
> Application: AS_Document_Safe
> Error: <er.extensions.validation.ERXValidationException object:
> <com.as.Model.Person pk:"1">; propertyKey: documentScans; type:
> ObjectsRemovalException; additionalExceptions: ()>
> Reason: Cannot delete this <b>Person</b>. You should first delete the
> items in its <b>Document Scans</b>.
> OK, Am I missing some rule somewhere?
>
> Since I was looking at a ListPerson page, I expected the ‘Reason’ to be at
> the top of the table.
>
> Anyone have any solution here?
>
> Ted
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