From 0e94b6404193fe791610ac70bbb5de5560e70b06 Mon Sep 17 00:00:00 2001
From: Steven Loria <sloria1@gmail.com>
Date: Tue, 23 Jul 2019 22:30:49 -0400
Subject: [PATCH 1/2] Add documentation for parsing lists in query strings

---
 docs/quickstart.rst | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/docs/quickstart.rst b/docs/quickstart.rst
index fe2d42563..8437b18ac 100644
--- a/docs/quickstart.rst
+++ b/docs/quickstart.rst
@@ -195,6 +195,27 @@ Then decorate that function with :func:`Parser.error_handler <webargs.core.Parse
     def handle_error(error, req, schema, status_code, headers):
         raise CustomError(error.messages)
 
+Parsing Lists in Query Strings
+------------------------------
+
+Use `fields.DelimitedList <webargs.fields.DelimitedList>` to parse comma-separated
+lists in query parameters, e.g. ``/?permissions=read,write``
+
+.. code-block:: python
+
+    from webargs import fields
+
+    args = {"permissions": fields.DelimitedList(fields.Str())}
+
+If you expect repeated query parameters, e.g. ``/?repo=webargs&repo=marshmallow``, use
+`fields.List <marshmallow.fields.List>` instead.
+
+.. code-block:: python
+
+    from webargs import fields
+
+    args = {"repo": fields.List(fields.Str())}
+
 Nesting Fields
 --------------
 

From cdfbc8b34b2df3734c16a9bdb3e41130c26963f6 Mon Sep 17 00:00:00 2001
From: Steven Loria <sloria1@gmail.com>
Date: Tue, 23 Jul 2019 22:38:51 -0400
Subject: [PATCH 2/2] Use explicit type check instead of duck typing

See https://github.com/marshmallow-code/webargs/issues/406#issuecomment-514379744
---
 CHANGELOG.rst       | 12 ++++++++++++
 src/webargs/core.py |  6 +++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 2c9f5ca16..ade173963 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,18 @@
 Changelog
 ---------
 
+5.4.0 (unreleased)
+******************
+
+Changes:
+
+* Use explicit type check for `fields.DelimitedList` when deciding to
+  parse value with `getlist()` (`#406 (comment) <https://github.com/marshmallow-code/webargs/issues/406#issuecomment-514446228>`_ ).
+
+Support:
+
+* Add "Parsing Lists in Query Strings" section to docs (:issue:`406`).
+
 5.3.2 (2019-06-19)
 ******************
 
diff --git a/src/webargs/core.py b/src/webargs/core.py
index b4b2fb374..2f4a5be72 100644
--- a/src/webargs/core.py
+++ b/src/webargs/core.py
@@ -65,7 +65,11 @@ class Meta(object):
 
 def is_multiple(field):
     """Return whether or not `field` handles repeated/multi-value arguments."""
-    return isinstance(field, ma.fields.List) and not hasattr(field, "delimiter")
+    from webargs import fields  # prevent circular import
+
+    return isinstance(field, ma.fields.List) and not isinstance(
+        field, fields.DelimitedList
+    )
 
 
 def get_mimetype(content_type):