Fix recursive union

Author: yukinarit

examples/recursive_union.py

@@ -0,0 +1,31 @@
+from typing import List, Union
+from serde import serde, to_dict, InternalTagging, from_dict
+from dataclasses import dataclass
+
+
+@serde(tagging=InternalTagging("type"))
+@dataclass
+class Leaf:
+    value: int
+
+
+@dataclass
+class Node:
+    name: str
+    children: List[Union[Leaf, "Node"]]
+
+
+serde(Node, tagging=InternalTagging("type"))
+
+
+def main() -> None:
+    node1 = Node("node1", [Leaf(10)])
+    node2 = Node("node2", [node1])
+    d = to_dict(node2)
+    print(f"Into dict: {d}")
+    node = from_dict(Node, d)
+    print(f"From dict: {node}")
+
+
+if __name__ == "__main__":
+    main()

examples/runner.py

@@ -25,6 +25,7 @@
 import plain_dataclass_class_attribute
 import recursive
 import recursive_list
+import recursive_union
 import rename
 import rename_all
 import simple
@@ -80,6 +81,7 @@ def run_all():
     run(alias)
     run(recursive)
     run(recursive_list)
+    run(recursive_union)
     run(class_var)
     run(plain_dataclass)
     run(plain_dataclass_class_attribute)

serde/de.py

@@ -275,7 +275,7 @@ def wrap(cls: Type):
                 # We call deserialize and not wrap to make sure that we will use the default serde
                 # configuration for generating the deserialization function.
                 deserialize(typ)
-            if typ is cls or (is_primitive(typ) and not is_enum(typ)):
+            if is_primitive(typ) and not is_enum(typ):
                 continue
             if is_generic(typ):
                 g[typename(typ)] = get_origin(typ)

serde/se.py

@@ -275,7 +275,7 @@ def wrap(cls: Type[Any]):
                 # configuration for generating the serialization function.
                 serialize(typ)
 
-            if typ is cls or (is_primitive(typ) and not is_enum(typ)):
+            if is_primitive(typ) and not is_enum(typ):
                 continue
             g[typename(typ)] = typ