fix: pydantic_core._pydantic_core.ValidationError: 2 validation errors for DatasetDetailResponse (#36753)

api/models/dataset.py

@@ -322,6 +322,12 @@ class Dataset(Base):
 
     @property
     def retrieval_model_dict(self):
+        """Return a normalized retrieval model payload for API responses.
+
+        Older rows may only persist a partial retrieval model dict. Merge the
+        stored value over the current defaults so response validation still sees
+        the required baseline fields.
+        """
         default_retrieval_model = {
             "search_method": RetrievalMethod.SEMANTIC_SEARCH,
             "reranking_enable": False,
@@ -329,7 +335,10 @@ class Dataset(Base):
             "top_k": 2,
             "score_threshold_enabled": False,
         }
-        return self.retrieval_model or default_retrieval_model
+        if not self.retrieval_model:
+            return default_retrieval_model
+
+        return {**default_retrieval_model, **self.retrieval_model}
 
     @property
     def tags(self):