refactor: simplify _extract_namespaced_type_fields, remove redundant try-except and post-processing

Made-with: Cursor

.bumpversion.cfg

@@ -1,10 +0,0 @@
-[bumpversion]
-current_version = 0.1.5
-commit = True
-tag = True
-tag_name = v{new_version}
-message = Bump version: {current_version} → {new_version}
-
-[bumpversion:file:msgcenterpy/__init__.py]
-search = __version__ = "{current_version}"
-replace = __version__ = "{new_version}"

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
-          python-version: "3.10" # Use minimum version for consistency
+          python-version: "3.10"
 
       - name: Install dependencies
         run: |
@@ -33,27 +33,27 @@ jobs:
         with:
           extra_args: --all-files
 
-  # Step 2: Basic build and test with minimum Python version (3.10)
+  # Step 2: Basic build and test
   basic-build:
-    name: Basic build (Python 3.10, Ubuntu)
+    name: Basic build (Python 3.11, Ubuntu)
     runs-on: ubuntu-latest
     needs: [code-format] # Only run after code formatting passes
 
     steps:
       - uses: actions/checkout@v6
 
-      - name: Set up Python 3.10
+      - name: Set up Python 3.11
         uses: actions/setup-python@v6
         with:
-          python-version: "3.10"
+          python-version: "3.11"
 
       - name: Cache pip dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ~/.cache/pip
-          key: ubuntu-pip-3.10-${{ hashFiles('**/pyproject.toml') }}
+          key: ubuntu-pip-3.11-${{ hashFiles('**/pyproject.toml') }}
           restore-keys: |
-            ubuntu-pip-3.10-
+            ubuntu-pip-3.11-
 
       - name: Install dependencies
         run: |
@@ -122,7 +122,7 @@ jobs:
           args: --detailed-output --output-format json
 
       - name: Upload security reports
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: security-reports
           path: |
@@ -155,7 +155,7 @@ jobs:
         run: twine check dist/*
 
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: dist
           path: dist/
@@ -173,7 +173,7 @@ jobs:
         exclude:
           # Skip the combination we already tested in basic-build
           - os: ubuntu-latest
-            python-version: "3.10"
+            python-version: "3.11"
 
     steps:
       - uses: actions/checkout@v6
@@ -184,7 +184,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: Cache pip dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('**/pyproject.toml') }}

.github/workflows/publish.yml

@@ -34,7 +34,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
-          python-version: "3.10" # Use minimum version for consistency
+          python-version: "3.10"
 
       - name: Install dependencies
         run: |
@@ -46,27 +46,27 @@ jobs:
         with:
           extra_args: --all-files
 
-  # Step 2: Basic build and test with minimum Python version (3.10)
+  # Step 2: Basic build and test
   basic-build:
-    name: Basic build (Python 3.10, Ubuntu)
+    name: Basic build (Python 3.11, Ubuntu)
     runs-on: ubuntu-latest
     needs: [code-format] # Only run after code formatting passes
 
     steps:
       - uses: actions/checkout@v6
 
-      - name: Set up Python 3.10
+      - name: Set up Python 3.11
         uses: actions/setup-python@v6
         with:
-          python-version: "3.10"
+          python-version: "3.11"
 
       - name: Cache pip dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ~/.cache/pip
-          key: ubuntu-pip-3.10-${{ hashFiles('**/pyproject.toml') }}
+          key: ubuntu-pip-3.11-${{ hashFiles('**/pyproject.toml') }}
           restore-keys: |
-            ubuntu-pip-3.10-
+            ubuntu-pip-3.11-
 
       - name: Install dependencies
         run: |
@@ -78,7 +78,7 @@ jobs:
         run: |
           pytest -v
 
-          # Step 3: ROS2 integration test
+  # Step 3: ROS2 integration test
   test-with-ros2:
     name: ROS2 integration test
     runs-on: ubuntu-latest
@@ -135,7 +135,7 @@ jobs:
           args: --detailed-output --output-format json
 
       - name: Upload security reports
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: security-reports
           path: |
@@ -197,7 +197,7 @@ jobs:
           twine check dist/*
 
       - name: Upload distributions
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: release-dists
           path: dist/
@@ -217,7 +217,7 @@ jobs:
 
     steps:
       - name: Retrieve release distributions
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v7
         with:
           name: release-dists
           path: dist/
@@ -240,7 +240,7 @@ jobs:
 
     steps:
       - name: Retrieve release distributions
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v7
         with:
           name: release-dists
           path: dist/
@@ -260,7 +260,7 @@ jobs:
 
     steps:
       - name: Retrieve release distributions
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v7
         with:
           name: release-dists
           path: dist/

.pre-commit-config.yaml

@@ -1,81 +1,77 @@
+# MsgCenterPy pre-commit hooks
+# All tool configs are centralised in pyproject.toml
+
 repos:
-  # Code formatting
+  # ── Code formatting ───────────────────────────────────────────
   - repo: https://github.com/psf/black
-    rev: 23.12.1
+    rev: 26.1.0
     hooks:
       - id: black
         language_version: python3
-        args: ["--line-length=120"]
+        # Reads [tool.black] from pyproject.toml
 
-  # Import sorting
+  # ── Import sorting ────────────────────────────────────────────
   - repo: https://github.com/pycqa/isort
-    rev: 5.13.2
+    rev: 6.1.0
     hooks:
       - id: isort
-        args: ["--profile", "black", "--multi-line", "3"]
+        # Reads [tool.isort] from pyproject.toml
 
-  # Linting
+  # ── Linting ───────────────────────────────────────────────────
   - repo: https://github.com/pycqa/flake8
-    rev: 7.0.0
+    rev: 7.3.0
     hooks:
       - id: flake8
-        args:
-          - "--max-line-length=200" # Allow longer lines after black formatting
-          - "--extend-ignore=E203,W503,F401,E402,E721,F841"
-          - "--exclude=build,dist,__pycache__,.mypy_cache,.pytest_cache,htmlcov,.idea,.vscode,docs/_build,msgcenterpy.egg-info"
+        additional_dependencies: ["Flake8-pyproject"]
+        # Reads [tool.flake8] from pyproject.toml via Flake8-pyproject
 
-  # Type checking
+  # ── Type checking ─────────────────────────────────────────────
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.8.0
+    rev: v1.19.1
     hooks:
       - id: mypy
-        additional_dependencies: [types-PyYAML, types-jsonschema, pydantic]
-        args: ["--ignore-missing-imports", "--disable-error-code=unused-ignore"]
-        files: "^(msgcenterpy/)" # Check both source code and tests
+        args: ["--config-file=pyproject.toml"]
+        files: "^(msgcenterpy/)"
+        additional_dependencies:
+          - "pydantic>=2.0"
+          - "types-PyYAML"
+          - "types-jsonschema"
 
-  # General pre-commit hooks
+  # ── Basic file checks ────────────────────────────────────────
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.5.0
+    rev: v6.0.0
     hooks:
-      # File checks
       - id: trailing-whitespace
-        args: [--markdown-linebreak-ext=md]
       - id: end-of-file-fixer
       - id: check-yaml
       - id: check-json
       - id: check-toml
-      - id: check-xml
-
-      # Security
       - id: check-merge-conflict
       - id: check-case-conflict
       - id: check-symlinks
       - id: check-added-large-files
-        args: ["--maxkb=1000"]
-
-      # Python specific
       - id: check-ast
       - id: debug-statements
       - id: name-tests-test
-        args: ["--django"]
+        args: ["--pytest-test-first"]
 
-  # Security scanning
+  # ── Security scanning ────────────────────────────────────────
   - repo: https://github.com/PyCQA/bandit
-    rev: 1.7.5
+    rev: 1.9.3
     hooks:
       - id: bandit
         args: ["-c", "pyproject.toml"]
         additional_dependencies: ["bandit[toml]", "pbr"]
-        exclude: "^tests/"
+        exclude: "^(tests/)"
 
-  # YAML/JSON formatting
+  # ── YAML/JSON/Markdown formatting ────────────────────────────
   - repo: https://github.com/pre-commit/mirrors-prettier
     rev: v4.0.0-alpha.8
     hooks:
       - id: prettier
         types_or: [yaml, json, markdown]
-        exclude: "^(build/|dist/|__pycache__/|\\.mypy_cache/|\\.pytest_cache/|htmlcov/|\\.idea/|\\.vscode/|docs/_build/|msgcenterpy\\.egg-info/)"
+        exclude: "^(build/|dist/|__pycache__/|\\.mypy_cache/|\\.pytest_cache/|htmlcov/|\\.vscode/|docs/_build/|msgcenterpy\\.egg-info/)"
 
 # Global settings
-default_stages: [pre-commit, pre-push]
+default_stages: [pre-commit]
 fail_fast: false

docs/development/contributing.rst

@@ -88,18 +88,18 @@ Testing
 Version Management
 ------------------
 
-This project uses `bump2version` for version management. It's automatically installed with dev dependencies.
+This project uses `bump-my-version <https://github.com/callowayproject/bump-my-version>`_ for version management. It's automatically installed with dev dependencies. Configuration lives in ``pyproject.toml`` under ``[tool.bumpversion]``.
 
 .. code-block:: bash
 
    # Bug fixes (0.0.1 → 0.0.2)
-   bump2version patch
+   bump-my-version bump patch
 
    # New features (0.0.2 → 0.1.0)
-   bump2version minor
+   bump-my-version bump minor
 
    # Breaking changes (0.1.0 → 1.0.0)
-   bump2version major
+   bump-my-version bump major
 
 After bumping version, push changes and tags:
 

msgcenterpy/__init__.py

@@ -5,7 +5,7 @@ A multi-format message conversion system supporting seamless conversion
 between ROS2, Pydantic, Dataclass, JSON, Dict, YAML and JSON Schema.
 """
 
-__version__ = "0.1.5"
+__version__ = "0.1.8"
 __license__ = "Apache-2.0"
 
 from msgcenterpy.core.envelope import MessageEnvelope, create_envelope

msgcenterpy/core/type_info.py

@@ -277,9 +277,16 @@ class TypeInfo:
         # Special handling for object types
         if self.is_object and self.object_fields:
             properties = {}
+            required_fields = []
             for field_name, field_info in self.object_fields.items():
                 properties[field_name] = field_info.to_json_schema_property(include_constraints)
+                if field_info.has_constraint(ConstraintType.REQUIRED):
+                    required_fields.append(field_name)
             property_schema["properties"] = properties
+            if required_fields:
+                property_schema["required"] = required_fields
+            if self.field_name and self.field_name != Consts.ELEMENT_TYPE_INFO_SYMBOL:
+                property_schema["title"] = self.field_name
 
         # Add description
         if self.original_type:

msgcenterpy/instances/json_schema_instance.py

@@ -19,6 +19,87 @@ class JSONSchemaMessageInstance(MessageInstance[Dict[str, Any]]):
     _json_schema: Dict[str, Any] = dict()
     _json_data: Dict[str, Any] = dict()
 
+    _JSON_TYPE_DEFAULTS: Dict[str, Any] = {
+        "string": "",
+        "integer": 0,
+        "number": 0.0,
+        "boolean": False,
+        "null": None,
+    }
+
+    @classmethod
+    def generate_default_from_schema(cls, schema: Dict[str, Any]) -> Dict[str, Any]:
+        """根据JSON Schema生成包含所有字段默认值的数据字典
+
+        优先使用schema中显式声明的default，否则根据类型生成零值。
+        支持嵌套object递归生成。
+
+        Args:
+            schema: JSON Schema定义（根schema或子object schema）
+
+        Returns:
+            包含所有字段默认值的数据字典
+
+        Examples:
+            >>> schema = {
+            ...     "type": "object",
+            ...     "properties": {
+            ...         "name": {"type": "string"},
+            ...         "age": {"type": "integer", "default": 18},
+            ...         "active": {"type": "boolean"},
+            ...     }
+            ... }
+            >>> JSONSchemaMessageInstance.generate_default_from_schema(schema)
+            {'name': '', 'age': 18, 'active': False}
+        """
+        properties = schema.get("properties", {})
+        result: Dict[str, Any] = {}
+
+        for field_name, field_schema in properties.items():
+            if isinstance(field_schema, dict):
+                result[field_name] = cls._generate_field_default(field_schema)
+
+        return result
+
+    @classmethod
+    def _generate_field_default(cls, field_schema: Dict[str, Any]) -> Any:
+        """根据单个字段的schema生成默认值
+
+        Args:
+            field_schema: 字段的JSON Schema定义
+
+        Returns:
+            字段的默认值
+        """
+        if "default" in field_schema:
+            return field_schema["default"]
+
+        if "const" in field_schema:
+            return field_schema["const"]
+
+        if "enum" in field_schema:
+            enum_values = field_schema["enum"]
+            if enum_values:
+                return enum_values[0]
+
+        json_type = field_schema.get("type")
+
+        if json_type is None:
+            return None
+
+        # 联合类型取第一个非null类型
+        if isinstance(json_type, list):
+            non_null = [t for t in json_type if t != "null"]
+            json_type = non_null[0] if non_null else "null"
+
+        if json_type == "object":
+            return cls.generate_default_from_schema(field_schema)
+
+        if json_type == "array":
+            return []
+
+        return cls._JSON_TYPE_DEFAULTS.get(json_type)
+
     def __init__(self, inner_data: Dict[str, Any], schema: Dict[str, Any], **kwargs: Any) -> None:
         """
         初始化JSON Schema消息实例

msgcenterpy/instances/ros2_instance.py

@@ -40,11 +40,7 @@ class ROS2MessageInstance(MessageInstance[Any]):
         interface = (
             "msg"
             if ".msg" in module_name
-            else "srv"
-            if ".srv" in module_name
-            else "action"
-            if ".action" in module_name
-            else "msg"
+            else "srv" if ".srv" in module_name else "action" if ".action" in module_name else "msg"
         )
         return f"{package}/{interface}/{class_name}" if package and class_name else f"{module_name}.{class_name}"
 
@@ -221,10 +217,9 @@ class ROS2MessageInstance(MessageInstance[Any]):
             # 基础类型的约束将在 field_accessor 中自动添加
             pass
         elif isinstance(definition_type, NamespacedType):
-            # 对象类型，标记为对象并提取字段信息
             type_info.is_object = True
             type_info.add_constraint(ConstraintType.TYPE_KEEP, True)
-            # 这里可以进一步扩展来提取对象字段信息
+            self._extract_namespaced_type_fields(type_info, definition_type)
         # 提取元素类型信息
         if get_element_type:
             if not isinstance(definition_type, AbstractNestedType):
@@ -240,3 +235,33 @@ class ROS2MessageInstance(MessageInstance[Any]):
                 original_type=definition_type.value_type,
             )
             self._extract_from_rosidl_definition(type_info.element_type_info)
+
+    def _extract_namespaced_type_fields(self, type_info: TypeInfo, namespaced_type: "NamespacedType") -> None:
+        """从 NamespacedType（嵌套 ROS2 消息）中提取所有字段信息，填充 object_fields
+
+        递归处理嵌套的消息类型，确保多层嵌套的结构也能正确提取。
+
+        Args:
+            type_info: 要填充 object_fields 的 TypeInfo 对象
+            namespaced_type: rosidl NamespacedType 定义
+        """
+        msg_cls = import_message_from_namespaced_type(namespaced_type)
+        msg_instance = msg_cls()
+
+        # noinspection PyProtectedMember
+        slots = msg_instance._fields_and_field_types
+        slot_types = msg_instance.SLOT_TYPES
+
+        for field_name, slot_type in zip(slots, slot_types):
+            std_type = TypeConverter.rosidl_definition_to_standard(slot_type)
+            python_type = TypeConverter.standard_to_python_type(std_type)
+            field_type_info = TypeInfo(
+                field_name=field_name,
+                field_path=f"{type_info.field_path}.{field_name}",
+                standard_type=std_type,
+                python_type=python_type,
+                original_type=slot_type,
+            )
+            self._extract_from_rosidl_definition(field_type_info)
+            field_type_info.add_constraint(ConstraintType.REQUIRED, True)
+            type_info.object_fields[field_name] = field_type_info

pyproject.toml

@@ -40,13 +40,17 @@ ros2 = [
 ]
 dev = [
     "pytest>=7.0.0",
-    "black>=22.0.0",
-    "isort>=5.0.0",
-    "mypy>=1.0.0",
+    "pytest-asyncio>=0.21.0",
+    "black>=23.0.0",
+    "isort>=5.13.0",
+    "flake8>=7.0.0",
+    "Flake8-pyproject>=1.2.0",
+    "mypy>=1.8.0",
     "types-jsonschema>=4.0.0",
     "types-PyYAML>=6.0.0",
-    "pre-commit>=2.20.0",
-    "bump2version>=1.0.0"
+    "bandit[toml]>=1.7.0",
+    "pre-commit>=3.5.0",
+    "bump-my-version>=0.28.0",
 ]
 docs = [
     "sphinx>=5.0.0",
@@ -70,14 +74,26 @@ include = ["msgcenterpy*"]
 [tool.setuptools.dynamic]
 version = {attr = "msgcenterpy.__version__"}
 
+# ── Formatting ────────────────────────────────────────────────
+
 [tool.black]
 line-length = 120
-target-version = ['py310', 'py311', 'py312']
+target-version = ["py310", "py311", "py312"]
 
 [tool.isort]
 profile = "black"
+line_length = 120
 multi_line_output = 3
 
+# ── Linting ───────────────────────────────────────────────────
+
+[tool.flake8]
+max-line-length = 200
+extend-ignore = ["E203", "W503", "W291", "W293", "W391", "F401", "E402", "E721", "F841", "F541"]
+exclude = ["build", "dist", "__pycache__", ".mypy_cache", ".pytest_cache", "htmlcov", ".vscode", "docs/_build", "msgcenterpy.egg-info"]
+
+# ── Type checking ─────────────────────────────────────────────
+
 [tool.mypy]
 python_version = "3.10"
 plugins = ["pydantic.mypy"]
@@ -86,8 +102,11 @@ warn_unused_configs = true
 disallow_untyped_defs = true
 no_implicit_optional = true
 warn_redundant_casts = true
-warn_unused_ignores = true
+warn_unused_ignores = false
 strict_equality = true
+ignore_missing_imports = true
+
+# ── Testing ───────────────────────────────────────────────────
 
 [tool.pytest.ini_options]
 testpaths = ["tests"]
@@ -95,12 +114,33 @@ python_files = "test_*.py"
 python_classes = "Test*"
 python_functions = "test_*"
 addopts = "-v --tb=short --strict-markers --strict-config -ra --color=yes"
-
 filterwarnings = [
     "ignore::DeprecationWarning",
-    "ignore::PendingDeprecationWarning"
+    "ignore::PendingDeprecationWarning",
 ]
 
+# ── Security ──────────────────────────────────────────────────
+
 [tool.bandit]
 exclude_dirs = ["tests", "build", "dist"]
 skips = ["B101", "B601"]
+
+# ── Version management ────────────────────────────────────────
+
+[tool.bumpversion]
+current_version = "0.1.8"
+commit = true
+tag = true
+push = true
+tag_name = "v{new_version}"
+message = "release: bump version {current_version} → {new_version}"
+
+[[tool.bumpversion.files]]
+filename = "pyproject.toml"
+search = 'current_version = "{current_version}"'
+replace = 'current_version = "{new_version}"'
+
+[[tool.bumpversion.files]]
+filename = "msgcenterpy/__init__.py"
+search = '__version__ = "{current_version}"'
+replace = '__version__ = "{new_version}"'

tests/test_json_schema_instance.py

@@ -432,6 +432,159 @@ class TestJSONSchemaValidation:
         assert len(invalid_instance._validation_errors) > 0
 
 
+class TestGenerateDefaultFromSchema:
+    """generate_default_from_schema 默认值生成测试"""
+
+    def test_basic_types(self):
+        """测试基础类型的零值生成"""
+        schema = {
+            "type": "object",
+            "properties": {
+                "s": {"type": "string"},
+                "i": {"type": "integer"},
+                "n": {"type": "number"},
+                "b": {"type": "boolean"},
+                "null_field": {"type": "null"},
+            },
+        }
+        result = JSONSchemaMessageInstance.generate_default_from_schema(schema)
+
+        assert result == {"s": "", "i": 0, "n": 0.0, "b": False, "null_field": None}
+
+    def test_explicit_default_takes_priority(self):
+        """测试显式 default 优先于类型零值"""
+        schema = {
+            "type": "object",
+            "properties": {
+                "name": {"type": "string", "default": "anonymous"},
+                "age": {"type": "integer", "default": 18},
+                "score": {"type": "number", "default": 99.5},
+            },
+        }
+        result = JSONSchemaMessageInstance.generate_default_from_schema(schema)
+
+        assert result == {"name": "anonymous", "age": 18, "score": 99.5}
+
+    def test_enum_uses_first_value(self):
+        """测试枚举类型使用第一个枚举值"""
+        schema = {
+            "type": "object",
+            "properties": {
+                "status": {"type": "string", "enum": ["active", "inactive", "pending"]},
+            },
+        }
+        result = JSONSchemaMessageInstance.generate_default_from_schema(schema)
+
+        assert result == {"status": "active"}
+
+    def test_const_value(self):
+        """测试 const 关键字"""
+        schema = {
+            "type": "object",
+            "properties": {
+                "version": {"type": "string", "const": "v2"},
+            },
+        }
+        result = JSONSchemaMessageInstance.generate_default_from_schema(schema)
+
+        assert result == {"version": "v2"}
+
+    def test_array_type(self):
+        """测试数组类型返回空列表"""
+        schema = {
+            "type": "object",
+            "properties": {
+                "tags": {"type": "array", "items": {"type": "string"}},
+            },
+        }
+        result = JSONSchemaMessageInstance.generate_default_from_schema(schema)
+
+        assert result == {"tags": []}
+
+    def test_nested_object(self):
+        """测试嵌套对象递归生成"""
+        schema = {
+            "type": "object",
+            "properties": {
+                "user": {
+                    "type": "object",
+                    "properties": {
+                        "name": {"type": "string"},
+                        "address": {
+                            "type": "object",
+                            "properties": {
+                                "city": {"type": "string"},
+                                "zip": {"type": "integer"},
+                            },
+                        },
+                    },
+                },
+            },
+        }
+        result = JSONSchemaMessageInstance.generate_default_from_schema(schema)
+
+        assert result == {
+            "user": {
+                "name": "",
+                "address": {"city": "", "zip": 0},
+            }
+        }
+
+    def test_union_type(self):
+        """测试联合类型取第一个非 null 类型"""
+        schema = {
+            "type": "object",
+            "properties": {
+                "nullable_str": {"type": ["string", "null"]},
+                "nullable_int": {"type": ["null", "integer"]},
+            },
+        }
+        result = JSONSchemaMessageInstance.generate_default_from_schema(schema)
+
+        assert result == {"nullable_str": "", "nullable_int": 0}
+
+    def test_no_type_field(self):
+        """测试缺少 type 定义时返回 None"""
+        schema = {
+            "type": "object",
+            "properties": {
+                "unknown": {"description": "no type defined"},
+            },
+        }
+        result = JSONSchemaMessageInstance.generate_default_from_schema(schema)
+
+        assert result == {"unknown": None}
+
+    def test_empty_schema(self):
+        """测试空 schema 返回空字典"""
+        result = JSONSchemaMessageInstance.generate_default_from_schema({})
+        assert result == {}
+
+        result2 = JSONSchemaMessageInstance.generate_default_from_schema({"type": "object"})
+        assert result2 == {}
+
+    def test_generated_default_creates_valid_instance(self):
+        """测试生成的默认值可以直接创建有效的实例"""
+        schema = {
+            "type": "object",
+            "properties": {
+                "name": {"type": "string"},
+                "count": {"type": "integer"},
+                "active": {"type": "boolean"},
+                "items": {"type": "array", "items": {"type": "string"}},
+                "meta": {
+                    "type": "object",
+                    "properties": {"version": {"type": "integer"}},
+                },
+            },
+        }
+        defaults = JSONSchemaMessageInstance.generate_default_from_schema(schema)
+        instance = JSONSchemaMessageInstance(defaults, schema)
+
+        assert len(instance._validation_errors) == 0
+        assert instance.get_python_dict() == defaults
+
+
 # 运行测试的便捷函数
 def run_json_schema_tests():
     """运行 JSON Schema 相关测试"""