fix: Make Pydantic imports lazy

Issue-39: #39

Author: pawamoy

pyproject.toml

@@ -82,6 +82,7 @@ maintain = [
 ]
 ci = [
     "duty>=1.6",
+    "griffe>=1.10",
     "ruff>=0.4",
     "pytest>=8.2",
     "pytest-cov>=5.0",

src/griffe_pydantic/_internal/dynamic.py

@@ -10,7 +10,6 @@
     Kind,
     get_logger,
 )
-from pydantic.fields import FieldInfo
 
 from griffe_pydantic._internal import common
 
@@ -19,6 +18,8 @@
 
 def _process_attribute(obj: Any, attr: Attribute, cls: Class, *, processed: set[str]) -> None:
     """Handle Pydantic fields."""
+    from pydantic.fields import FieldInfo  # noqa: PLC0415
+
     if attr.canonical_path in processed:
         return
     processed.add(attr.canonical_path)

tests/test_extension.py

@@ -66,6 +66,7 @@ def test_extension(analysis: str) -> None:
         "package",
         modules={"__init__.py": code},
         extensions=Extensions(PydanticExtension(schema=True)),
+        search_sys_path=analysis == "dynamic",
     ) as package:
         assert package