feat: base增加PositiveDecimalField

apps/utils/fields.py

@@ -1,5 +1,9 @@
 from django.conf import settings
 from rest_framework import serializers
+from django.db.models import DecimalField
+from django.core.validators import MinValueValidator
+from django.utils.functional import cached_property
+from decimal import Decimal
 
 
 class MyFilePathField(serializers.CharField):
@@ -8,3 +12,9 @@ class MyFilePathField(serializers.CharField):
         if 'http' in value:
             return str(value)
         return settings.BASE_URL + str(value)
+
+class PositiveDecimalField(DecimalField):
+    
+    @cached_property
+    def validators(self):
+        return [MinValueValidator(Decimal('0.0'))] + super().validators