Re: Testing if an EO would be deletable
Re: Testing if an EO would be deletable
- Subject: Re: Testing if an EO would be deletable
- From: Chuck Hill <email@hidden>
- Date: Tue, 19 Jan 2010 10:46:54 -0800
On Jan 19, 2010, at 1:47 AM, Paul Hoadley wrote:
Hello,
I was just reading Johan Henselmans's thread entitled "validating
deleting an object with relationship", and it reminded me of a
similar question I had recently: is there a convenient way to ask
EOF if a particular EO _would be_ deletable if I tried to delete it?
No. The stock validateForDelete() does not follow the the
relationships and call validateForDelete() on the to-many with a
Cascade delete rule. This does not happen until saveChanges().
I have a component where I list some EOs, and I want to offer a
"Delete" hyperlink next to only those which would be deletable given
the model's delete rules. Is the easiest way to do this to call
validateForDelete() and see if it throws a ValidationException? I
assume that would answer the question, it just seems a bit clumsy.
That will answer it for that one object directly, but the delete may
be thwarted by a related object's validateForDelete(). I'd add a
custom method like public boolean canBeDeleted() and then also use
that in validateForDelete().
Chuck
--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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