Benjamin-eecs/openrsi-commit-runtime-assets

1diff --git a/CHANGELOG.rst b/CHANGELOG.rst2index d02eb12..3ba8020 1006443--- a/CHANGELOG.rst4+++ b/CHANGELOG.rst5@@ -1,9 +1,34 @@6 Changelog7 ---------8 9-8.3.1 (Unreleased)10+8.4.0 (Unreleased)11 ******************12 13+Features:14+15+* Add a new class attribute, ``empty_value`` to ``DelimitedList`` and16+  ``DelimitedTuple``, with a default of ``""``.17+  This controls the value deserialized when an empty string is seen.18+19+``empty_value`` can be used to handle types other than strings more gracefully, e.g.20+21+.. code-block:: python22+23+    from webargs import fields24+25+26+    class IntList(fields.DelimitedList):27+        empty_value = 028+29+30+    myfield = IntList(fields.Int())31+32+.. note::33+34+    ``empty_value`` will be changing in webargs v9.0 to be ``missing`` by35+    default. This will allow use of fields with ``load_default`` to specify36+    handling of the empty value.37+38 Changes:39 40 * Type annotations for ``FlaskParser`` have been improved41diff --git a/src/webargs/fields.py b/src/webargs/fields.py42index 5598b54..96590a3 10064443--- a/src/webargs/fields.py44+++ b/src/webargs/fields.py45@@ -15,6 +15,8 @@ tells webargs where to parse the request argument from.46 """47 from __future__ import annotations48 49+import typing50+51 import marshmallow as ma52 53 # Expose all fields from marshmallow.fields.54@@ -64,6 +66,8 @@ class DelimitedFieldMixin:55     delimiter: str = ","56     # delimited fields set is_multiple=False for webargs.core.is_multiple57     is_multiple: bool = False58+    # NOTE: in 8.x this defaults to "" but in 9.x it will be 'missing'59+    empty_value: typing.Any = ""60 61     def _serialize(self, value, attr, obj, **kwargs):62         # serializing will start with parent-class serialization, so that we correctly63@@ -77,6 +81,8 @@ class DelimitedFieldMixin:64         if not isinstance(value, (str, bytes)):65             raise self.make_error("invalid")66         values = value.split(self.delimiter) if value else []67+        # convert empty strings to the empty value; typically "" and therefore a no-op68+        values = [v or self.empty_value for v in values]69         return super()._deserialize(values, attr, data, **kwargs)70 71 72@@ -117,6 +123,12 @@ class DelimitedTuple(DelimitedFieldMixin, ma.fields.Tuple):73 74     default_error_messages = {"invalid": "Not a valid delimited tuple."}75 76-    def __init__(self, tuple_fields, *, delimiter: str | None = None, **kwargs):77+    def __init__(78+        self,79+        tuple_fields,80+        *,81+        delimiter: str | None = None,82+        **kwargs,83+    ):84         self.delimiter = delimiter or self.delimiter85         super().__init__(tuple_fields, **kwargs)86