Allow fractional tax rates

postgresqleu/invoices/migrations/0021_alter_vatrate_vatpercent.py

@@ -0,0 +1,20 @@
+# Generated by Django 3.2.22 on 2024-09-29 02:12
+
+import django.core.validators
+from django.db import migrations
+import postgresqleu.invoices.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0020_regtransfer_processor'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='vatrate',
+            name='vatpercent',
+            field=postgresqleu.invoices.models.VatPercentage(decimal_places=6, default=0, max_digits=9, validators=[django.core.validators.MaxValueValidator(100), django.core.validators.MinValueValidator(0)], verbose_name='VAT percentage'),
+        ),
+    ]

postgresqleu/invoices/models.py

@@ -235,13 +235,22 @@ class Meta:
         ordering = ('-id', )
 
 
+class VatPercentage(models.DecimalField):
+    def __str__(self):
+        return str(self.normalize())
+
+    def from_db_value(self, value, expression, connection):
+        return value.normalize()
+
+    def to_python(self, value):
+        return super().to_python(value).normalize()
+
+
 class VatRate(models.Model):
     name = models.CharField(max_length=100, blank=False, null=False)
     shortname = models.CharField(max_length=16, blank=False, null=False, verbose_name="Short name")
-    vatpercent = models.IntegerField(null=False, default=0, verbose_name="VAT percentage",
-                                     validators=[MaxValueValidator(100), MinValueValidator(0)])
+    vatpercent = VatPercentage(null=False, default=0, verbose_name="VAT percentage", max_digits=9, decimal_places=6, validators=[MaxValueValidator(100), MinValueValidator(0)])
     vataccount = models.ForeignKey(Account, null=False, blank=False, on_delete=models.CASCADE, verbose_name="VAT account")
-
     _safe_attributes = ('vatpercent', 'shortstr', 'shortname', 'name')
 
     def __str__(self):