fix(api): Fix TypeError while serializing File object

api/core/variables/utils.py

@@ -1,8 +1,26 @@
+import json
 from collections.abc import Iterable, Sequence
 
+from .segment_group import SegmentGroup
+from .segments import ArrayFileSegment, FileSegment, Segment
+
 
 def to_selector(node_id: str, name: str, paths: Iterable[str] = ()) -> Sequence[str]:
     selectors = [node_id, name]
     if paths:
         selectors.extend(paths)
     return selectors
+
+
+class SegmentJSONEncoder(json.JSONEncoder):
+    def default(self, o):
+        if isinstance(o, ArrayFileSegment):
+            return [v.model_dump() for v in o.value]
+        elif isinstance(o, FileSegment):
+            return o.value.model_dump()
+        elif isinstance(o, SegmentGroup):
+            return [self.default(seg) for seg in o.value]
+        elif isinstance(o, Segment):
+            return o.value
+        else:
+            super().default(o)

api/models/workflow.py

@@ -985,7 +985,7 @@ class WorkflowDraftVariable(Base):
         self._set_selector([self.node_id, name])
 
     def set_value(self, value: Segment):
-        self.value = json.dumps(value.value)
+        self.value = json.dumps(value, cls=variable_utils.SegmentJSONEncoder)
         self.value_type = value.value_type
 
     def get_node_id(self) -> str | None: