explicitly import BazelTarget into Job and JobStep to prevent errors

Summary: This is in response to an error such as https://forge-sentry.pp.dropbox.com/sentry/changes-staging/issues/478/. In particular, because we don't explicitly import the class BazelTarget, there is a possibility that it is not defined at the time when SqlAlchemy is initialized. In the past, it looks like we got lucky...

Test Plan: ran locally

Reviewers: anupc

Reviewed By: anupc

Subscribers: changesbot, kylec

Differential Revision: https://tails.corp.dropbox.com/D224853

changes/models/job.py

@@ -12,6 +12,7 @@
 from changes.db.types.guid import GUID
 from changes.db.types.json import JSONEncodedDict
 from changes.db.utils import model_repr
+from changes.models.bazeltarget import BazelTarget
 
 
 class Job(db.Model):
@@ -60,7 +61,7 @@ class Job(db.Model):
     project = relationship('Project')
     source = relationship('Source')
 
-    targets = relationship('BazelTarget', backref=backref('job'))
+    targets = relationship(BazelTarget, backref=backref('job'))
 
     __repr__ = model_repr('label', 'target')
 

changes/models/jobstep.py

@@ -11,6 +11,7 @@
 from changes.db.types.enum import Enum
 from changes.db.types.guid import GUID
 from changes.db.types.json import JSONEncodedDict
+from changes.models.bazeltarget import BazelTarget
 
 
 class FutureJobStep(object):
@@ -69,7 +70,7 @@ class JobStep(db.Model):
     project = relationship('Project')
     node = relationship('Node')
     phase = relationship('JobPhase', backref=backref('steps', order_by='JobStep.date_started'))
-    targets = relationship('BazelTarget', backref=backref('step'))
+    targets = relationship(BazelTarget, backref=backref('step'))
 
     __repr__ = model_repr('label')