1 files changed, 13 insertions, 0 deletions
diff --git a/main/fields.py b/main/fields.py
new file mode 100644
index 00000000..53494772
--- /dev/null
+++ b/main/fields.py
@@ -0,0 +1,13 @@
+from django.db import models
+
+
+class PositiveBigIntegerField(models.BigIntegerField):
+    def get_internal_type(self):
+        return "BigIntegerField"
+
+    def formfield(self, **kwargs):
+        defaults = { 'min_value': 0 }
+        defaults.update(kwargs)
+        return super(PositiveBigIntegerField, self).formfield(**defaults)
+
+# vim: set ts=4 sw=4 et: