On 4/8/15 5:14 PM, Tim Tisdall wrote:
I have some code I'm trying to figure out... Here it is:
from sqlalchemy import event
from colanderalchemy import setup_schema
from sqlalchemy.orm import mapper
event.listen(mapper, 'mapper_configured', setup_schema)
It appears to call `setup_schema` on every ORM class that derives from
the `declarative_base()`. All the documentation in SQLAlchemy shows
event.listen being called on specific classes or mappers and I'm
wondering if this usage is a documented feature.
yes, mapper events can be passed the "mapper" function itself which is
recognized as one way to assign an event to all mappers.
I found a mention in the 0.7 docs, but no where else:
http://docs.sqlalchemy.org/en/rel_0_7/orm/events.html#sqlalchemy.orm.events.MapperEvents
that would qualify as "documented" :) The formatting is cleaner in
http://docs.sqlalchemy.org/en/latest/orm/events.html#sqlalchemy.orm.events.MapperEvents.
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