fix(tools): 修复了optional字段无法被解析的问题

tools/json_example.py

@@ -1,5 +1,5 @@
 from pydantic import BaseModel, create_model
-from typing import Any, Dict, List, Optional, get_args, get_origin
+from typing import Any, Dict, List, Optional, Union, get_args, get_origin
 import json
 from datetime import datetime, date
 
@@ -13,20 +13,15 @@ def generate_example_json(model: type[BaseModel]) -> str:
         args = get_args(field_type)
 
         if origin is list or origin is List:
-            if args:
-                return [_generate_example(args[0])]
-            else:
-                return []
+            return [_generate_example(args[0])] if args else []
         elif origin is dict or origin is Dict:
-            if len(args) == 2 and args[0] is str:
+            if len(args) == 2:
                 return {"key": _generate_example(args[1])}
-            else:
-                return {}
-        elif origin is Optional or origin is type(None):
-            if args:
-                return _generate_example(args[0])
-            else:
-                return None
+            return {}
+        elif origin is Union:
+            # 处理 Optional 类型（Union[T, None]）
+            non_none_args = [arg for arg in args if arg is not type(None)]
+            return _generate_example(non_none_args[0]) if non_none_args else None
         elif field_type is str:
             return "string"
         elif field_type is int:
@@ -39,10 +34,18 @@ def generate_example_json(model: type[BaseModel]) -> str:
             return datetime.now().isoformat()
         elif field_type is date:
             return date.today().isoformat()
-        elif issubclass(field_type, BaseModel):
-            return generate_example_json(field_type)
+        elif isinstance(field_type, type) and issubclass(field_type, BaseModel):
+            return json.loads(generate_example_json(field_type))
         else:
-            return "unknown"  # 对于未知类型返回 "unknown"
+            # 处理直接类型注解（非泛型）
+            if field_type is type(None):
+                return None
+            try:
+                if issubclass(field_type, BaseModel):
+                    return json.loads(generate_example_json(field_type))
+            except TypeError:
+                pass
+            return "unknown"
 
     example_data = {}
     for field_name, field in model.model_fields.items():
@@ -55,9 +58,7 @@ if __name__ == "__main__":
     from pathlib import Path
     # 添加项目根目录到sys.path
     sys.path.append(str(Path(__file__).resolve().parent.parent))
-    from schema import Q_A
-    class Q_A_list(BaseModel):
-        Q_As: List[Q_A]
+    from schema import dataset
 
     print("示例 JSON:")
-    print(generate_example_json(Q_A_list))
+    print(generate_example_json(dataset))