Merge branch '137-re-introduce-data-migrations' into 'master'

Resolve "Re-introduce data migrations"

Closes #137

See merge request AlekSIS/AlekSIS!112

aleksis/core/migrations/0006_create_default_term.py

+from django.db import migrations, models
+
+from datetime import date
+
+def create_or_mark_current_term(apps, schema_editor):
+    db_alias = schema_editor.connection.alias
+
+    SchoolTerm = apps.get_model('core', 'SchoolTerm')  # noqa
+
+    if not SchoolTerm.objects.filter(current=True).exists():
+        if SchoolTerm.objects.using(db_alias).exists():
+            term = SchoolTerm.objects.using(db_alias).latest('date_start')
+            term.current=True
+            term.save()
+        else:
+            SchoolTerm.objects.using(db_alias).create(date_start=date.today(), current=True)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0005_add_verbose_names_meta'),
+    ]
+
+    operations = [
+        migrations.RunPython(create_or_mark_current_term)
+    ]

aleksis/core/migrations/0007_create_admin_user.py

+from django.contrib.auth import get_user_model
+from django.db import migrations
+
+
+def create_superuser(apps, schema_editor):
+    User = get_user_model()
+
+    if not User.objects.filter(is_superuser=True).exists():
+        User.objects.create_superuser(
+            username='admin',
+            email='root@example.com',
+            password='admin'
+        ).save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0006_create_default_term'),
+    ]
+
+    operations = [
+        migrations.RunPython(create_superuser)
+    ]
+