def get_url(self, source_url, create=False):
"""Return a database record for a file"""
import sqlalchemy.orm.exc
s = self.bundle.database.session
try:
o = s.query(File).filter(File.source_url == source_url).one()
except sqlalchemy.orm.exc.NoResultFound:
if create:
o = File(source_url=source_url, path=source_url, process="none")
s.add(o)
s.commit()
else:
return None
o.session = s # Files have SavableMixin
return o
