Serialize missing field values for none

worf/fields.py

@@ -5,7 +5,25 @@
 from django.db.models import Manager
 
 
-class File(fields.Field):
+class SerializeMissing:
+    def __init__(self, *args, **kwargs):
+        if "dump_default" not in kwargs:
+            kwargs["dump_default"] = [] if kwargs.get("many") else None
+        return super().__init__(*args, **kwargs)
+
+
+class SerializeQuerysets:
+    def _serialize(self, nested_obj, attr, obj, **kwargs):
+        if isinstance(nested_obj, Manager):
+            nested_obj = nested_obj.all()
+        return super()._serialize(nested_obj, attr, obj, **kwargs)
+
+
+class Field(SerializeMissing, fields.Field):
+    pass
+
+
+class File(Field):
     _CHECK_ATTRIBUTE = False
 
     def __init__(self, serialize=None, deserialize=None, **kwargs):
@@ -34,15 +52,21 @@ def _call_or_raise(self, func, value, attr):
         return func(value)
 
 
-class Nested(fields.Nested):
-    def _serialize(self, nested_obj, attr, obj, **kwargs):
-        if isinstance(nested_obj, Manager):
-            nested_obj = nested_obj.all()
-        return super()._serialize(nested_obj, attr, obj, **kwargs)
+class Nested(SerializeQuerysets, fields.Nested):
+    pass
 
 
-class Pluck(fields.Pluck):
-    def _serialize(self, nested_obj, attr, obj, **kwargs):
-        if isinstance(nested_obj, Manager):
-            nested_obj = nested_obj.all()
-        return super()._serialize(nested_obj, attr, obj, **kwargs)
+class Pluck(SerializeQuerysets, fields.Pluck):
+    pass
+
+
+for field in map(fields.__dict__.get, fields.__all__):
+    if fields.Field not in field.__bases__ or SerializeMissing in field.__bases__:
+        continue
+    field.__bases__ = (SerializeMissing, *field.__bases__)
+
+
+__all__ = [
+    *fields.__all__,
+    "File",
+]