Hey,
Michael Bayer wrote:
> subclass RelationProperty fine, but don't get involved with overriding its
> internal _xxx methods.
So:
Override do_init() completely (not calling the super do_init()).
Do something like:
def do_init(self):
self._get_target()
self._process_dependent_arguments()
self.custom_joins()
self._determine_joins()
self._determine_synchronize_pairs()
self._determine_direction()
self._determine_local_remote_pairs()
self._post_init()
super(RelationProperty, self).do_init()
Then introduce a custom_joins() that will now have access to a properly
set up local_table and mapper_table and self.parent and self.target etc,
and implement something very close to _determine_joins except inserting
custom arguments.
Problem: the backref will already have been set up, and this will not
get the custom arguments.
So, I need to override __init__, copying it completely and setting up
the backref there if needed, or hackishly override the previously set up
backref in custom_joins.
It's pretty involved, ugly, and fragile. It'd be nicer if there was a
way to do this generically, as I just want to add a custom condition to
the automatically set up primary...
Regards,
Martijn
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