Made some migrations work backwards, too.

 - Legacy-Id: 11964

Author: levkowetz

ietf/submit/migrations/0012_auto_20160414_1902.py

@@ -15,11 +15,20 @@ def add_draft_submission_state_name(apps, schema_editor):
                                                 used=True,
                                                 order=8)
 
+    def del_draft_submission_state_name(apps, schema_editor):
+        # We can't import the model directly as it may be a newer
+        # version than this migration expects. We use the historical version.
+        DraftSubmissionStateName = apps.get_model("name", "DraftSubmissionStateName")
+        DraftSubmissionStateName.objects.filter(slug="waiting-for-draft",
+                                                name="Manual Post Waiting for Draft",
+                                                desc="",
+                                                used=True,
+                                                order=8).delete()
 
     dependencies = [
         ('submit', '0011_submissionemail'),
     ]
 
     operations = [
-        migrations.RunPython(add_draft_submission_state_name),
+        migrations.RunPython(add_draft_submission_state_name, del_draft_submission_state_name),
     ]

ietf/submit/migrations/0013_auto_20160415_2120.py

@@ -30,10 +30,13 @@ def remove_old_submissions(apps, schema_editor):
 
             remove_submission_files(submission)
 
+    def reverse(apps, schema_editor):
+        pass
+
     dependencies = [
         ('submit', '0012_auto_20160414_1902'),
     ]
 
     operations = [
-        migrations.RunPython(remove_old_submissions),
+        migrations.RunPython(remove_old_submissions, reverse),
     ]

ietf/submit/migrations/0014_auto_20160627_1945.py

@@ -10,16 +10,25 @@ def add_next_states(apps, schema_editor):
 
         cancelled = DraftSubmissionStateName.objects.get(slug="cancel")
         posted = DraftSubmissionStateName.objects.get(slug="posted")
-        mad = DraftSubmissionStateName.objects.get(slug="waiting-for-draft")
+        waiting = DraftSubmissionStateName.objects.get(slug="waiting-for-draft")
 
-        mad.next_states.add(cancelled)
-        mad.next_states.add(posted)
-        mad.save()
+        waiting.next_states.add(cancelled)
+        waiting.next_states.add(posted)
+
+    def reverse(apps, schema_editor):
+        DraftSubmissionStateName = apps.get_model("name", "DraftSubmissionStateName")
+
+        cancelled = DraftSubmissionStateName.objects.get(slug="cancel")
+        posted = DraftSubmissionStateName.objects.get(slug="posted")
+        waiting = DraftSubmissionStateName.objects.get(slug="waiting-for-draft")
+
+        waiting.next_states.remove(cancelled)
+        waiting.next_states.remove(posted)
 
     dependencies = [
         ('submit', '0013_auto_20160415_2120'),
     ]
 
     operations = [
-        migrations.RunPython(add_next_states),
+        migrations.RunPython(add_next_states, reverse),
     ]