From 71164972af31936cb56dee872136700432c2e556 Mon Sep 17 00:00:00 2001
From: Jace Browning <jacebrowning@gmail.com>
Date: Sun, 18 Apr 2021 14:28:08 -0400
Subject: [PATCH] Loop through all converter subclasses when resolving string
 annotations

---
 CHANGELOG.md                       | 4 ++++
 datafiles/converters/__init__.py   | 4 ++--
 datafiles/tests/test_converters.py | 5 +++++
 datafiles/utils.py                 | 6 ++++++
 4 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 39ff7c33..80bdb1ee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 0.13.1 (2021-04-18)
+
+- Fixed handling of string annotations for extended types.
+
 # 0.13 (2021-04-17)
 
 - Added support for generic types.
diff --git a/datafiles/converters/__init__.py b/datafiles/converters/__init__.py
index 312476d9..ea7a7329 100644
--- a/datafiles/converters/__init__.py
+++ b/datafiles/converters/__init__.py
@@ -6,7 +6,7 @@
 import log
 from ruamel.yaml.scalarfloat import ScalarFloat
 
-from ..utils import cached
+from ..utils import cached, subclasses
 from ._bases import Converter
 from .builtins import Boolean, Float, Integer, String
 from .containers import Dataclass, Dictionary, List, Set
@@ -119,7 +119,7 @@ def map_type(cls, *, name: str = '', item_cls: Optional[type] = None):
 
     if isinstance(cls, str):
         log.debug(f'Searching for class matching {cls!r} annotation')
-        for cls2 in Converter.__subclasses__():
+        for cls2 in subclasses(Converter):
             if cls2.__name__ == cls:
                 register(cls, cls2)
                 log.debug(f'Registered {cls2} as new converter')
diff --git a/datafiles/tests/test_converters.py b/datafiles/tests/test_converters.py
index 575e3584..f5fbdaf4 100644
--- a/datafiles/tests/test_converters.py
+++ b/datafiles/tests/test_converters.py
@@ -112,6 +112,11 @@ def it_handles_string_type_annotations(expect):
         converter = converters.map_type('float')
         expect(converter.TYPE) == float
 
+    def it_handles_string_type_annotations_for_extensions(expect):
+        converter = converters.map_type('Number')
+        expect(converter.TYPE) == float
+        expect(converter.__name__) == 'Number'
+
     def it_rejects_unknown_types(expect):
         with expect.raises(
             TypeError,
diff --git a/datafiles/utils.py b/datafiles/utils.py
index e65d88fe..a8d47386 100644
--- a/datafiles/utils.py
+++ b/datafiles/utils.py
@@ -18,6 +18,12 @@
 cached = lru_cache()
 
 
+def subclasses(cls):
+    return set(cls.__subclasses__()).union(
+        [s for c in cls.__subclasses__() for s in subclasses(c)]
+    )
+
+
 def get_default_field_value(instance, name):
     for field in dataclasses.fields(instance):
         if field.name == name: