add priority to LocationGroup and and default -priority ordering

src/c3nav/mapdata/migrations/0021_auto_20170710_1916.py

@@ -0,0 +1,28 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.2 on 2017-07-10 17:16
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mapdata', '0020_auto_20170710_1848'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='locationgroup',
+            options={'ordering': ('-priority',), 'verbose_name': 'Location Group', 'verbose_name_plural': 'Location Groups'},
+        ),
+        migrations.AlterModelOptions(
+            name='locationgroupcategory',
+            options={'ordering': ('-priority',), 'verbose_name': 'Location Group Category', 'verbose_name_plural': 'Location Group Categories'},
+        ),
+        migrations.AddField(
+            model_name='locationgroup',
+            name='priority',
+            field=models.IntegerField(db_index=True, default=0),
+        ),
+    ]

src/c3nav/mapdata/models/locations.py

@@ -164,6 +164,7 @@ class LocationGroupCategory(TitledMixin, models.Model):
         verbose_name = _('Location Group Category')
         verbose_name_plural = _('Location Group Categories')
         default_related_name = 'locationgroupcategories'
+        ordering = ('-priority', )
 
     def _serialize(self, **kwargs):
         result = super()._serialize(**kwargs)
@@ -178,11 +179,13 @@ class LocationGroup(Location, models.Model):
                                  verbose_name=_('Category'))
     compiled_room = models.BooleanField(default=False, verbose_name=_('is a compiled room'))
     compiled_area = models.BooleanField(default=False, verbose_name=_('is a compiled area'))
+    priority = models.IntegerField(default=0, db_index=True)
 
     class Meta:
         verbose_name = _('Location Group')
         verbose_name_plural = _('Location Groups')
         default_related_name = 'locationgroups'
+        ordering = ('-priority',)
 
     def _serialize(self, **kwargs):
         result = super()._serialize(**kwargs)