fix openapi schema fields `to_snake` (#6036)

2 files changed, 33 insertions, 18 deletions

diff --git a/openbb_platform/core/openbb_core/app/router.py b/openbb_platform/core/openbb_core/app/router.py
index bb626caba4d..6e2e23de9b7 100644
--- a/openbb_platform/core/openbb_core/app/router.py
+++ b/openbb_platform/core/openbb_core/app/router.py
@@ -46,7 +46,7 @@ def model_t_discriminator(v: Any) -> str:
     if isinstance(v, dict):
         return v.get("provider", "openbb")
 
-    if isinstance(v, list):
+    if isinstance(v, list) and v:
         return model_t_discriminator(v[0])
 
     return getattr(v, "provider", "openbb")
@@ -397,7 +397,7 @@ class SignatureInspector:
         Also updates __name__ and __doc__ for API schemas.
         """
 
-        union_models = [Annotated[None, Tag("openbb")]]
+        union_models = [Annotated[Union[list, dict], Tag("openbb")]]
 
         for provider, return_type in return_map.items():
             union_models.append(Annotated[return_type, Tag(provider)])
@@ -406,15 +406,17 @@ class SignatureInspector:
             f"OBBject_{model}",
             __base__=OBBject,
             results=(
-                Annotated[
-                    Union[tuple(union_models)],  # type: ignore
-                    Field(
-                        ...,
-                        description="Serializable results.",
-                        discriminator=Discriminator(model_t_discriminator),
-                    ),
+                Optional[
+                    Annotated[
+                        Union[tuple(union_models)],  # type: ignore
+                        Field(
+                            None,
+                            description="Serializable results.",
+                            discriminator=Discriminator(model_t_discriminator),
+                        ),
+                    ]
                 ],
-                Field(..., description="Serializable results."),
+                Field(None, description="Serializable results."),
             ),
         )
 
diff --git a/openbb_platform/core/openbb_core/provider/registry_map.py b/openbb_platform/core/openbb_core/provider/registry_map.py
index ff9b710a3b8..5a2cd8e7c51 100644
--- a/openbb_platform/core/openbb_core/provider/registry_map.py
+++ b/openbb_platform/core/openbb_core/provider/registry_map.py
@@ -113,17 +113,30 @@ class RegistryMap:
         """Extract info (fields and docstring) from fetcher query params or data."""
         model: BaseModel = RegistryMap._get_model(fetcher, "data")
 
-        class DataModel(model):
-            model_config = ConfigDict(alias_generator=alias_generators.to_snake)
+        fields = {}
+        for field_name, field in model.model_fields.items():
+            field.alias_priority = None
+            fields[field_name] = (field.annotation, field)
 
-            provider: Literal[provider_str, "openbb"] = Field(  # type: ignore
-                default=provider_str,
-                description="The data provider for the data.",
-                exclude=True,
-            )
+        fields.pop("provider", None)
 
         return create_model(
-            model.__name__, __base__=DataModel, __module__=model.__module__
+            model.__name__.replace("Data", ""),
+            __doc__=model.__doc__,
+            __config__=ConfigDict(
+                extra="allow",
+                alias_generator=alias_generators.to_snake,
+                populate_by_name=True,
+            ),
+            provider=(
+                Literal[provider_str, "openbb"],  # type: ignore
+                Field(
+                    default=provider_str,
+                    description="The data provider for the data.",
+                    exclude=True,
+                ),
+            ),
+            **fields,
         )
 
     @staticmethod