listening for events on 'mapper'

[Tim Tisdall]

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.

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

[Mike Bayer]

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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[Tim Tisdall]

Sorry, I just saw the "the Mapper class itself and the mapper()
function indicate listening for all mappers." on the latest docs.
Thanks.

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