Add better billing state tracking

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/billing/admin.py

@@ -36,14 +36,14 @@ class PlanAdmin(admin.ModelAdmin):
 
 class BillingAdmin(admin.ModelAdmin):
     list_display = (
-        'user', 'plan', 'trial',
+        'user', 'plan', 'state',
         'list_projects',
         'count_changes_1m', 'count_changes_1q', 'count_changes_1y',
         'count_repositories', 'count_strings', 'count_words',
         'count_languages',
         'in_limits',
     )
-    list_filter = ('plan', 'trial')
+    list_filter = ('plan', 'state')
     search_fields = ('user__username', 'projects__name')
 
     def list_projects(self, obj):

weblate/billing/migrations/0008_billing_state.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.2 on 2016-02-10 12:59
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('billing', '0007_invoice'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='billing',
+            name='state',
+            field=models.IntegerField(choices=[(0, 'Active'), (1, 'Trial'), (2, 'Expired')], default=0),
+        ),
+    ]

weblate/billing/migrations/0009_remove_billing_trial.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.2 on 2016-02-10 12:59
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('billing', '0008_billing_state'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='billing',
+            name='trial',
+        ),
+    ]

weblate/billing/models.py

@@ -55,10 +55,21 @@ class Plan(models.Model):
 
 @python_2_unicode_compatible
 class Billing(models.Model):
+    STATE_ACTIVE = 0
+    STATE_TRIAL = 1
+    STATE_EXPIRED = 2
+
     plan = models.ForeignKey(Plan)
     user = models.OneToOneField(User)
     projects = models.ManyToManyField(Project, blank=True)
-    trial = models.BooleanField(default=False)
+    state = models.IntegerField(
+        choices=(
+            (STATE_ACTIVE, _('Active')),
+            (STATE_TRIAL, _('Trial')),
+            (STATE_EXPIRED, _('Expired')),
+        ),
+        default=STATE_ACTIVE,
+    )
 
     def __str__(self):
         return '{0} ({1})'.format(self.user, self.plan)