+# suite names DMs can upload to
+dm_suites = ['unstable', 'experimental']
+
+def get_newest_source(source, session):
+ 'returns the newest DBSource object in dm_suites'
+ ## the most recent version of the package uploaded to unstable or
+ ## experimental includes the field "DM-Upload-Allowed: yes" in the source
+ ## section of its control file
+ q = session.query(DBSource).filter_by(source = source). \
+ filter(DBSource.suites.any(Suite.suite_name.in_(dm_suites))). \
+ order_by(desc('source.version'))
+ return q.first()
+