Michael Bayer wrote:
>
> Martijn Faassen wrote:
>>
>> Hey,
>>
>> Michael Bayer wrote:
>>> Martijn Faassen wrote:
>>>> Michael Bayer wrote:
>>>>> subclass RelationProperty fine, but don't get involved with
>>>>> overriding
>>>>> its
>>>>> internal _xxx methods.
>>>> So:
>>>>
specifically regarding backref(), I've simplified the internals for this
in trunk rev 6390. The recipe I gave for overriding _determine_joins()
still holds, except no knowledge of "backref" is required:
class MyRelation(RelationProperty):
def _determine_joins(self):
self.primaryjoin = join_condition(self.parent.local_table,
self.target) & (self.parent.local_table.c.id>0)
The entire "backref" calculation now occurs within _generate_backref() at
the end of the do_init() procedure, and the BackRef object is gone.
http://www.sqlalchemy.org/trac/changeset/6390
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