feat: datetime_now helper util

app/base/forms/utils.py

@@ -0,0 +1,8 @@
+from django.utils import timezone
+
+from datetime import timedelta
+
+
+def datetime_now():
+    now = timezone.now()
+    return now - timedelta(microseconds=now.microsecond)  # remove precision

app/base/migrations/0002_alter_booking_begin_time.py

@@ -0,0 +1,20 @@
+# Generated by Django 4.2 on 2023-06-02 14:45
+
+import app.base.forms.fields
+import app.base.forms.utils
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('base', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='booking',
+            name='begin_time',
+            field=app.base.forms.fields.DateTimeField(default=app.base.forms.utils.datetime_now, verbose_name='Beginn'),
+        ),
+    ]

app/base/models/booking.py

@@ -2,9 +2,9 @@ from django.db import models
 from django.db.models import Q
 from django.forms.utils import to_current_timezone
 from django.urls import reverse
-from django.utils import timezone
 
 from app.base.forms.fields import DateTimeField, TextField
+from app.base.forms.utils import datetime_now
 
 from datetime import datetime
 from typing import TYPE_CHECKING
@@ -20,7 +20,7 @@ class Booking(models.Model):
         'BookingType', on_delete=models.PROTECT, verbose_name='Art')
     user: 'models.ForeignKey[Person]' = models.ForeignKey(
         'Person', on_delete=models.CASCADE, verbose_name='Nutzer:in')
-    begin_time = DateTimeField('Beginn', default=datetime.now)
+    begin_time = DateTimeField('Beginn', default=datetime_now)
     end_time = DateTimeField('Ende', blank=True, null=True)
     comment = TextField('Kommentar', blank=True)
 
@@ -62,7 +62,7 @@ class Booking(models.Model):
     def currently_open_checkin(for_user: 'Person|OuterRef') -> 'Booking|None':
         return Booking.objects.filter(
             Q(user=for_user),
-            Q(begin_time__lte=timezone.now()),
+            Q(begin_time__lte=datetime_now()),
             Q(end_time=None),
             Q(type__is_checkin=True)
         ).first()

app/base/views/trigger/toggle_checkin.py

@@ -1,9 +1,8 @@
-from datetime import timedelta
 from django.contrib.auth.mixins import LoginRequiredMixin
 from django.shortcuts import redirect
-from django.utils import timezone
 from django.views import View
 
+from app.base.forms.utils import datetime_now
 from app.base.models import Person, Booking, BookingType
 
 
@@ -12,8 +11,7 @@ class ToggleCheckinView(LoginRequiredMixin, View):
         user = Person.objects.get(id=kwargs['user_id'])
         next = self.request.GET.get('next')
         booking = user.current_checkin  # performs db query
-        now = timezone.now()
+        now = datetime_now()
-        now -= timedelta(microseconds=now.microsecond)  # remove precision
 
         if booking:
             booking.end_time = now