Adapt to new Pydantic error

As I've upped the minimum pydantic version anyway, there's no need to support two versions - I've just updated the code to check for a `RuntimeError` instead of a `SchemaError`.

I've also updated my test case, which no longer causes Pydantic to fail - I've found another combination that does cause the same error, and we now use that.

Author: rwb27

src/labthings_fastapi/utilities/__init__.py

@@ -6,7 +6,6 @@
 from weakref import WeakSet
 from pydantic import BaseModel, ConfigDict, Field, RootModel, create_model
 from pydantic.dataclasses import dataclass
-from pydantic_core import SchemaError
 
 from labthings_fastapi.exceptions import UnsupportedConstraintError
 from .introspection import EmptyObject
@@ -129,7 +128,7 @@ def wrap_plain_types_in_rootmodel(
     :raises UnsupportedConstraintError: if constraints are provided for an
         unsuitable type, for example `allow_inf_nan` for an `int` property, or
         any constraints for a `BaseModel` subclass.
-    :raises SchemaError: if other errors prevent Pydantic from creating a schema
+    :raises RuntimeError: if other errors prevent Pydantic from creating a schema
         for the generated model.
     """
     try:  # This needs to be a `try` as basic types are not classes
@@ -148,13 +147,9 @@ def wrap_plain_types_in_rootmodel(
             root=(model, Field(**constraints)),
             __base__=LabThingsRootModelWrapper,
         )
-    except SchemaError as e:
-        for error in e.errors():
-            if error["loc"][-1] in constraints:
-                key = error["loc"][-1]
-                raise UnsupportedConstraintError(
-                    f"Constraint {key} is not supported for type {model!r}."
-                ) from e
+    except RuntimeError as e:
+        if "Unable to apply constraint" in str(e):
+            raise UnsupportedConstraintError(str(e)) from e
         raise e
 
 

tests/test_properties.py

@@ -438,7 +438,7 @@ def test_bad_property_constraints():
     """Test that bad constraints raise errors at definition time."""
 
     class BadConstraintThing(lt.Thing):
-        bad_prop: int = lt.property(default=0, allow_inf_nan=False)
+        bad_prop: str = lt.property(default="hello", allow_inf_nan=True)
 
     # Some constraints cause errors when the model is built. So far
     # I believe only allow_inf_nan on int does this.