scratch work on serializing from a proxy

src/numpydantic/interface/hdf5.py

@@ -50,14 +50,13 @@ from typing import (
     NamedTuple,
     Optional,
     Tuple,
-    TypedDict,
     TypeVar,
     Union,
 )
 
 import numpy as np
-from pydantic import GetCoreSchemaHandler, SerializationInfo
+from pydantic import SerializationInfo
-from pydantic_core import CoreSchema, core_schema
+from pydantic_core import SchemaSerializer, core_schema
 
 from numpydantic.interface.interface import Interface, JsonDict
 from numpydantic.types import DtypeType, NDArrayType
@@ -88,17 +87,6 @@ class H5ArrayPath(NamedTuple):
     """Refer to a specific field within a compound dtype"""
 
 
-class H5ArrayPathDict(TypedDict):
-    """Location specifier for arrays within an HDF5 file"""
-
-    file: Union[Path, str]
-    """Location of HDF5 file"""
-    path: str
-    """Path within the HDF5 file"""
-    field: Optional[Union[str, List[str]]] = None
-    """Refer to a specific field within a compound dtype"""
-
-
 class H5JsonDict(JsonDict):
     """Round-trip Json-able version of an HDF5 dataset"""
 
@@ -113,6 +101,51 @@ class H5JsonDict(JsonDict):
         )
 
 
+def to_json(self, info: SerializationInfo):
+    """
+    Serialize H5Proxy to JSON, as the interface does,
+    in cases when the interface is not able to be used
+    (eg. like when used as an `extra` field in a model without a type annotation)
+    """
+    from numpydantic.serialization import postprocess_json
+
+    if info.round_trip:
+        as_json = {
+            "type": H5Interface.name,
+        }
+        as_json.update(self._h5arraypath._asdict())
+    else:
+        try:
+            dset = self.open()
+            as_json = dset[:].tolist()
+        finally:
+            self.close()
+    return postprocess_json(as_json, info)
+
+
+def _make_pydantic_schema():
+    return core_schema.typed_dict_schema(
+        {
+            "file": core_schema.typed_dict_field(
+                core_schema.str_schema(), required=True
+            ),
+            "path": core_schema.typed_dict_field(
+                core_schema.str_schema(), required=True
+            ),
+            "field": core_schema.typed_dict_field(
+                core_schema.union_schema(
+                    [
+                        core_schema.str_schema(),
+                        core_schema.list_schema(core_schema.str_schema()),
+                    ],
+                ),
+                required=True,
+            ),
+        },
+        # serialization=
+    )
+
+
 class H5Proxy:
     """
     Proxy class to mimic numpy-like array behavior with an HDF5 array
@@ -135,6 +168,12 @@ class H5Proxy:
         annotation_dtype (dtype): Optional - the dtype of our type annotation
     """
 
+    __pydantic_serializer__ = SchemaSerializer(
+        core_schema.plain_serializer_function_ser_schema(
+            to_json, when_used="json", info_arg=True
+        )
+    )
+
     def __init__(
         self,
         file: Union[Path, str],
@@ -179,7 +218,8 @@ class H5Proxy:
             return obj[:]
 
     def __getattr__(self, item: str):
-
+        if item not in ("shape", "__pydantic_validator__"):
+            pdb.set_trace()
         if item == "__name__":
             # special case for H5Proxies that don't refer to a real file during testing
             return "H5Proxy"
@@ -294,33 +334,11 @@ class H5Proxy:
             v = np.array(v).astype("S32")
         return v
 
-    @classmethod
+    # @classmethod
-    def __get_pydantic_core_schema__(
+    # def __get_pydantic_core_schema__(
-        cls, source_type: Any, handler: GetCoreSchemaHandler
+    #     cls, source_type: Any, handler: GetCoreSchemaHandler
-    ) -> CoreSchema:
+    # ) -> CoreSchema:
-        pdb.set_trace()
+    #     return cls._make_pydantic_schema()
-        return core_schema.typed_dict_schema(
-            {
-                "file": core_schema.typed_dict_field(
-                    core_schema.str_schema(), required=True
-                ),
-                "path": core_schema.typed_dict_field(
-                    core_schema.str_schema(), required=True
-                ),
-                "field": core_schema.typed_dict_field(
-                    core_schema.union_schema(
-                        [
-                            core_schema.str_schema(),
-                            core_schema.list_schema(core_schema.str_schema()),
-                        ],
-                    ),
-                    required=True,
-                ),
-            },
-            serialization=core_schema.plain_serializer_function_ser_schema(
-                cls.to_json, when_used="json"
-            ),
-        )
 
     # file: Union[Path, str]
     # """Location of HDF5 file"""
@@ -334,27 +352,6 @@ class H5Proxy:
 
     #
     # @model_serializer(when_used="json")
-    @staticmethod
-    def to_json(self, info: SerializationInfo):
-        """
-        Serialize H5Proxy to JSON, as the interface does,
-        in cases when the interface is not able to be used
-        (eg. like when used as an `extra` field in a model without a type annotation)
-        """
-        from numpydantic.serialization import postprocess_json
-
-        if info.round_trip:
-            as_json = {
-                "type": H5Interface.name,
-            }
-            as_json.update(self._h5arraypath._asdict())
-        else:
-            try:
-                dset = self.open()
-                as_json = dset[:].tolist()
-            finally:
-                self.close()
-        return postprocess_json(as_json, info)
 
 
 class H5Interface(Interface):