Check for dtype subclass

docs/changelog.md

@@ -2,6 +2,10 @@
 
 ## 1.*
 
+### 1.3.2 - 24-08-12 - Allow subclasses of dtypes
+
+(also when using objects for dtypes, subclasses of that object are allowed to validate)
+
 ### 1.3.1 - 24-08-12 - Allow arbitrary dtypes, pydantic models as dtypes
 
 Previously we would only allow dtypes if we knew for sure that there was some

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "numpydantic"
-version = "1.3.1"
+version = "1.3.2"
 description = "Type and shape validation and serialization for numpy arrays in pydantic models"
 authors = [
     {name = "sneakers-the-rat", email = "[email protected]"},

src/numpydantic/interface/interface.py

@@ -128,7 +128,13 @@ def validate_dtype(self, dtype: DtypeType) -> bool:
         elif self.dtype is np.str_:
             valid = getattr(dtype, "type", None) is np.str_ or dtype is np.str_
         else:
-            valid = dtype == self.dtype
+            # try to match as any subclass, if self.dtype is a class
+            try:
+                valid = issubclass(dtype, self.dtype)
+            except TypeError:
+                # expected, if dtype or self.dtype is not a class
+                valid = dtype == self.dtype
+
         return valid
 
     def raise_for_dtype(self, valid: bool, dtype: DtypeType) -> None:

tests/conftest.py

@@ -66,6 +66,10 @@ class BadModel(BaseModel):
     x: int
 
 
+class SubClass(BasicModel):
+    pass
+
+
 RGB_UNION: TypeAlias = Union[
     NDArray[Shape["* x, * y"], Number],
     NDArray[Shape["* x, * y, 3 r_g_b"], Number],
@@ -143,6 +147,7 @@ def shape_cases(request) -> ValidationCase:
         ValidationCase(annotation=MODEL, dtype=BasicModel, passes=True),
         ValidationCase(annotation=MODEL, dtype=BadModel, passes=False),
         ValidationCase(annotation=MODEL, dtype=int, passes=False),
+        ValidationCase(annotation=MODEL, dtype=SubClass, passes=True),
     ],
     ids=[
         "float",
@@ -169,6 +174,7 @@ def shape_cases(request) -> ValidationCase:
         "model-model",
         "model-badmodel",
         "model-int",
+        "model-subclass",
     ],
 )
 def dtype_cases(request) -> ValidationCase: