Can I add a condition to CakePHP's update statement?
Posted
by Don Kirkby
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Published on 2009-09-25T23:26:59Z
Indexed on
2010/04/08
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Since there doesn't seem to be any support for optimistic locking in CakePHP, I'm taking a stab at building a behaviour that implements it. After a little research into behaviours, I think I could run a query in the beforeSave event to check that the version field hasn't changed.
However, I'd rather implement the check by changing the update statement's WHERE clause from
WHERE id = ?
to
WHERE id = ? and version = ?
This way I don't have to worry about other requests changing the database record between the time I read the version and the time I execute the update. It also means I can do one database call instead of two.
I can see that the DboSource.update()
method supports conditions, but Model.save()
never passes any conditions to it.
It seems like I have a couple of options:
- Do the check in
beforeSave()
and live with the fact that it's not bulletproof. - Hack my local copy of CakePHP to check for a
conditions
key in theoptions
array ofModel.save()
and pass it along to theDboSource.update()
method.
Right now, I'm leaning in favour of the second option, but that means I can't share my behaviour with other users unless they apply my hack to their framework.
Have I missed an easier option?
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