Fix migrations for Django 2.0

requirements.txt

-Django>=1.11,<2.0
+Django>=2.0,<2.1
 django-localflavor>=1.6,<1.7
 Pillow>=4.3.0,<4.5.0
 django-compressor>=2.1,<3

website/activemembers/migrations/0008_auto_20160906_1015.py

@@ -7,6 +7,8 @@ from django.db import migrations
 
 class Migration(migrations.Migration):
 
+    atomic = False
+
     dependencies = [
         ('activemembers', '0007_mentors'),
     ]

website/activemembers/migrations/0015_datamigration_lifelong.py

@@ -4,6 +4,8 @@ from __future__ import unicode_literals
 
 from django.db import migrations, models
 
+import activemembers.models
+
 
 def remove_enddates(apps, schema_editor):
     Board = apps.get_model("activemembers", "Board")
@@ -21,5 +23,11 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        migrations.RunPython(remove_enddates)
+        migrations.AlterModelManagers(
+            name='board',
+            managers=[
+                ('objects', activemembers.models.BoardManager()),
+            ],
+        ),
+        migrations.RunPython(remove_enddates),
     ]

website/activemembers/migrations/0025_auto_20180108_1253.py

+# Generated by Django 2.0.1 on 2018-01-08 11:53
+
+import activemembers.models
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('activemembers', '0024_auto_20171129_2129'),
+    ]
+
+    operations = [
+        migrations.AlterModelManagers(
+            name='board',
+            managers=[
+                ('objects', activemembers.models.BoardManager()),
+            ],
+        ),
+    ]

website/activemembers/models.py

@@ -141,6 +141,9 @@ class Committee(models.Model, metaclass=ModelTranslateMeta):
 
 
 class BoardManager(models.Manager):
+
+    use_in_migrations = True
+
     def get_queryset(self):
         # sorting by descending order by default makes more sense for boards
         return (super().get_queryset()