fix: Don't crash on new config based on ConfigDict

Issue-6: #6

Author: pawamoy

src/griffe_pydantic/templates/material/_base/pydantic_model.html.jinja

@@ -17,7 +17,7 @@
       <p>Config:</p>
       <ul>
         {% for name, value in class.extra.griffe_pydantic.config.items() %}
-          <li><code>{{ name }}</code>: {{ value|highlight(language="python", inline=True) }}</li>
+          <li><code>{{ name }}</code>: {{ value|string|highlight(language="python", inline=True) }}</li>
         {% endfor %}
       </ul>
     {% endif %}

tests/conftest.py

@@ -1 +1,14 @@
 """Configuration for the pytest test suite."""
+
+import pytest
+from markdown import Markdown
+from mkdocstrings_handlers.python.handler import PythonHandler
+
+
+@pytest.fixture(name="python_handler")
+def fixture_python_handler() -> PythonHandler:
+    """Return a PythonHandler instance."""
+    handler = PythonHandler("python", "material")
+    handler.update_env(md=Markdown(extensions=["toc"]), config={})
+    handler.env.filters["convert_markdown"] = lambda *args, **kwargs: str(args) + str(kwargs)
+    return handler

tests/test_extension.py

@@ -2,10 +2,16 @@
 
 from __future__ import annotations
 
+from typing import TYPE_CHECKING
+
 from griffe import Extensions, temporary_visited_package
 
 from griffe_pydantic.extension import PydanticExtension
 
+if TYPE_CHECKING:
+    from mkdocstrings_handlers.python.handler import PythonHandler
+
+
 code = """
     from pydantic import field_validator, ConfigDict, BaseModel, Field
 
@@ -80,7 +86,37 @@ def test_imported_models() -> None:
             "__init__.py": "from ._private import MyModel\n\n__all__ = ['MyModel']",
             "_private.py": "from pydantic import BaseModel\n\nclass MyModel(BaseModel):\n    field1: str\n    '''Some field.'''\n",
         },
-        extensions=Extensions(PydanticExtension(schema=True)),
+        extensions=Extensions(PydanticExtension(schema=False)),
     ) as package:
         assert package["MyModel"].labels == {"pydantic-model"}
         assert package["MyModel.field1"].labels == {"pydantic-field"}
+
+
+def test_rendering_model_config_using_configdict(python_handler: PythonHandler) -> None:
+    """Test the extension with model config using ConfigDict."""
+    code = """
+    from pydantic import BaseModel, ConfigDict, Field
+
+    class Model(BaseModel):
+        usage: str | None = Field(
+            None,
+            description="Some description.",
+            example="Some example.",
+        )
+        model_config = ConfigDict(
+            json_schema_extra={
+                "example": {
+                    "usage": "Some usage.",
+                    "limitations": "Some limitations.",
+                    "billing": "Some value.",
+                    "notice_period": "Some value.",
+                }
+            }
+        )
+    """
+    with temporary_visited_package(
+        "package",
+        modules={"__init__.py": code},
+        extensions=Extensions(PydanticExtension(schema=False)),
+    ) as package:
+        python_handler.render(package["Model"], {})  # Assert no errors.