Migrate VAT rate to use a single date field rather than datetime.

There is never any need to track the time as VAT rate hardly ever changes and will always do so at midnight. We were already assuming this anyway but it was generating loads of warnings/errors.

This will break your local VAT rate database if using sqlite, but it is tested with postgres and works fine.

RIGS/migrations/0025_auto_20160331_1302.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.4 on 2016-03-31 12:02
+from __future__ import unicode_literals
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('RIGS', '0024_auto_20160229_2042'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='profile',
+            name='username',
+            field=models.CharField(error_messages={'unique': 'A user with that username already exists.'}, help_text='Required. 30 characters or fewer. Letters, digits and @/./+/-/_ only.', max_length=30, unique=True, validators=[django.core.validators.RegexValidator('^[\\w.@+-]+$', 'Enter a valid username. This value may contain only letters, numbers and @/./+/-/_ characters.')], verbose_name='username'),
+        ),
+        migrations.AlterField(
+            model_name='vatrate',
+            name='start_at',
+            field=models.DateField(),
+        ),
+    ]

RIGS/models.py

@@ -1,9 +1,10 @@
 import hashlib
 import datetime, pytz
 
-from django.db import models, connection
+from django.db import models
 from django.contrib.auth.models import AbstractUser
 from django.conf import settings
+from django.utils import timezone
 from django.utils.functional import cached_property
 from django.utils.encoding import python_2_unicode_compatible
 from reversion import revisions as reversion
@@ -172,7 +173,7 @@ class Organisation(models.Model, RevisionMixin):
 
 class VatManager(models.Manager):
     def current_rate(self):
-        return self.find_rate(datetime.datetime.now())
+        return self.find_rate(timezone.now())
 
     def find_rate(self, date):
         # return self.filter(startAt__lte=date).latest()
@@ -187,7 +188,7 @@ class VatManager(models.Manager):
 @reversion.register
 @python_2_unicode_compatible
 class VatRate(models.Model, RevisionMixin):
-    start_at = models.DateTimeField()
+    start_at = models.DateField()
     rate = models.DecimalField(max_digits=6, decimal_places=6)
     comment = models.CharField(max_length=255)
 
@@ -238,11 +239,11 @@ class Venue(models.Model, RevisionMixin):
 class EventManager(models.Manager):
     def current_events(self):
         events = self.filter(
-            (models.Q(start_date__gte=datetime.date.today(), end_date__isnull=True, dry_hire=False) & ~models.Q(status=Event.CANCELLED)) |  # Starts after with no end
+            (models.Q(start_date__gte=timezone.now().date(), end_date__isnull=True, dry_hire=False) & ~models.Q(status=Event.CANCELLED)) |  # Starts after with no end
-            (models.Q(end_date__gte=datetime.date.today(), dry_hire=False) & ~models.Q(status=Event.CANCELLED)) |  # Ends after
+            (models.Q(end_date__gte=timezone.now().date(), dry_hire=False) & ~models.Q(status=Event.CANCELLED)) |  # Ends after
-            (models.Q(dry_hire=True, start_date__gte=datetime.date.today()) & ~models.Q(status=Event.CANCELLED)) |  # Active dry hire
+            (models.Q(dry_hire=True, start_date__gte=timezone.now().date()) & ~models.Q(status=Event.CANCELLED)) |  # Active dry hire
             (models.Q(dry_hire=True, checked_in_by__isnull=True) & (models.Q(status=Event.BOOKED) | models.Q(status=Event.CONFIRMED))) |  # Active dry hire GT
-            models.Q(status=Event.CANCELLED, start_date__gte=datetime.date.today())  # Canceled but not started
+            models.Q(status=Event.CANCELLED, start_date__gte=timezone.now().date())  # Canceled but not started
         ).order_by('start_date', 'end_date', 'start_time', 'end_time', 'meet_at').select_related('person', 'organisation', 'venue', 'mic')
         return events
 
@@ -264,12 +265,12 @@ class EventManager(models.Manager):
 
     def rig_count(self):
         event_count = self.filter(
-            (models.Q(start_date__gte=datetime.date.today(), end_date__isnull=True, dry_hire=False,
+            (models.Q(start_date__gte=timezone.now().date(), end_date__isnull=True, dry_hire=False,
                       is_rig=True) & ~models.Q(
                 status=Event.CANCELLED)) |  # Starts after with no end
-            (models.Q(end_date__gte=datetime.date.today(), dry_hire=False, is_rig=True) & ~models.Q(
+            (models.Q(end_date__gte=timezone.now().date(), dry_hire=False, is_rig=True) & ~models.Q(
                 status=Event.CANCELLED)) |  # Ends after
-            (models.Q(dry_hire=True, start_date__gte=datetime.date.today(), is_rig=True) & ~models.Q(
+            (models.Q(dry_hire=True, start_date__gte=timezone.now().date(), is_rig=True) & ~models.Q(
                 status=Event.CANCELLED)) |  # Active dry hire
             (models.Q(dry_hire=True, checked_in_by__isnull=True, is_rig=True) & (
                 models.Q(status=Event.BOOKED) | models.Q(status=Event.CONFIRMED)))  # Active dry hire GT