Allow to adjust the order of products (closes #60)

src/pretix/base/migrations/0003_auto_20150602_2232.py

@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+import django.core.validators
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0002_auto_20150524_1148'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='item',
+            options={'verbose_name_plural': 'Products', 'ordering': ('category__position', 'category', 'position'), 'verbose_name': 'Product'},
+        ),
+        migrations.AddField(
+            model_name='item',
+            name='position',
+            field=models.IntegerField(default=0),
+        ),
+        migrations.AlterField(
+            model_name='organizer',
+            name='slug',
+            field=models.SlugField(help_text='Should be short, only contain lowercase letters and numbers, and must be unique among your events. This is being used in addresses and bank transfer references.', validators=[django.core.validators.RegexValidator(message='The slug may only contain letters, numbers, dots and dashes.', regex='^[a-zA-Z0-9.-]+$')], verbose_name='Slug'),
+        ),
+    ]

src/pretix/base/models.py

@@ -860,10 +860,14 @@ class Item(Versionable):
         ),
         default=False
     )
+    position = models.IntegerField(
+        default=0
+    )
 
     class Meta:
         verbose_name = _("Product")
         verbose_name_plural = _("Products")
+        ordering = ("category__position", "category", "position")
 
     def __str__(self):
         return str(self.name)