Additional to FormValidation I often need model lowlevel
integritychecks before saving an object.

eg. to check if there are related objects before delete. I think these
checks should be placed in the model class, but it's neccessary to
call them from an actioncontroller and to deal there with the possible
thrown errors to generated userfriendly flash messages.

is there an existing pattern in the symfony framework that I could/
should use to implement this?

thx

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