fix: expose actionable API error details

backend/common/api.py

@@ -1,17 +1,65 @@
+import logging
+
 from rest_framework.views import exception_handler as drf_exception_handler
 
+logger = logging.getLogger(__name__)
+
+
+def _error_messages(details):
+    messages = []
+
+    def collect(value):
+        if isinstance(value, dict):
+            for item in value.values():
+                collect(item)
+        elif isinstance(value, (list, tuple)):
+            for item in value:
+                collect(item)
+        elif value is not None:
+            message = str(value).strip()
+            if message and message not in messages:
+                messages.append(message)
+
+    collect(details)
+    return messages
+
+
+def _error_message(details):
+    messages = _error_messages(details)
+    if not messages:
+        return "请求未能完成"
+    return "；".join(messages)[:300]
+
 
 def exception_handler(exc, context):
     response = drf_exception_handler(exc, context)
+    request = context.get("request")
     if response is None:
+        logger.exception(
+            "api_unhandled_error method=%s path=%s",
+            getattr(request, "method", "-"),
+            getattr(request, "path", "-"),
+        )
         return response
 
-    request = context.get("request")
+    details = response.data
+    code = getattr(exc, "default_code", "request_error")
+    message = _error_message(details)
+    fields = ",".join(details.keys()) if isinstance(details, dict) else "-"
+    logger.info(
+        "api_request_error method=%s path=%s status=%s code=%s fields=%s message=%s",
+        getattr(request, "method", "-"),
+        getattr(request, "path", "-"),
+        response.status_code,
+        code,
+        fields,
+        message,
+    )
     response.data = {
         "error": {
-            "code": getattr(exc, "default_code", "request_error"),
-            "message": "请求未能完成",
-            "details": response.data,
+            "code": code,
+            "message": message,
+            "details": details,
             "request_id": getattr(request, "request_id", None),
         }
     }