model.c.Company == mycompany? Just hoping that I didn't mix up the ORMs ;)
Andreas Am Mittwoch, den 05.03.2008, 10:14 +0100 schrieb Christoph Haas: > On Wed, Mar 05, 2008 at 08:31:12AM +0100, Christoph Haas wrote: > > Basically I have three tables like 'companies', 'departments' and > > 'employees'. I have already set up foreign keys and gave all of them > > one-to-many relationships. So a company has several departments. And > > each department has several employees. So for an ORM-mapped company > > object "mycompany" I can get the departments by the property > > "mycompany.departments". Works well. > > > > Now I'd like to create a query for all employees of a certain company. > > And I'm not sure how to properly define a mapper relation propery that > > would give me that. Like "mycompany.employees". Do I have to use JOINs > > myself in the mapper? > > > > In my application I'd then like to query like this: > > Session.query(Employee).filter_by(employee.company=my_company) > > Meanwhile I re-read > http://www.sqlalchemy.org/docs/04/ormtutorial.html#datamapping_joins > explaining that a relation path A->bars->B->bats->C->widgets->D is > queried as: > > session.query(Foo).join(['bars', 'bats', 'widgets']).filter(...) > > So in my example I already managed to get this working: > > session.query(Employee)join(['department','company']). \ > filter(model.Company.id==mycompany.id) > > Is this the common way to deal with Company>Department->Employee paths? > If it is - can I perhaps even omit the ".id" part somehow? I tried: > > session.query(Employee)join(['department','company']). \ > filter(model.Company==mycompany) > > But SQLAlchemy didn't like that: > > ArgumentError: filter() argument must be of type > sqlalchemy.sql.ClauseElement or string > > Thanks for any comments. > > Christoph
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