Fetch all Issue by assingment

gistfile1.py

## First fetch all assingments
qp = QueryParser({'assigned_to': [('=', account_id)]})
assignments = IssueAssignFactory.fetch(filters=qp.filters).resolve() # Do later, just for show
## Make new IssueAssignFactory.fetch that only fetch keys

# Alt 1
issues = ndb.get_multi([assignment.key().parent() for assignment in assignments])

# Alt 2, bad idea i think
qp = QueryParser({'key': [('=', [assignment.key().parent() for assignment in assignments])]})
issues = IssueFactory().fetch(filters=qp.filters).resolve() # Do later, just for show