Re: Pre-commit hooks

Michael Bayer <mike_mp <at> zzzcomputing.com> writes:

> easy enough to build yourself a generic MapperExtension that scans  
> incoming objects for a "_pre_commit()" method.

Yeah indeed.  I used this:

------------------------------
class HookExtension(MapperExtension):
    """ Extention to add pre-commit hooks.

    Hooks will be called in Mapped classes if they define any of these
    methods:
      * _pre_insert()
      * _pre_delete()
      * _pre_update()
    """
    def before_insert(self, mapper, connection, instance):
        if getattr(instance, "_pre_insert", None):
            instance._pre_insert()
        return EXT_CONTINUE

    def before_delete(self, mapper, connection, instance):
        if getattr(instance, "_pre_delete", None):
            instance._pre_delete()
        return EXT_CONTINUE

    def before_update(self, mapper, connection, instance):
        if getattr(instance, "_pre_update", None):
            instance._pre_update()
        return EXT_CONTINUE
------------------------------        

It works great.  Thanks for the pointers.

--

-- 
Yannick Gingras

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