refactor: Update field_type in HandleInput to use SerializableFieldTypes enum

src/backend/base/langflow/inputs/input_mixin.py

@@ -16,6 +16,7 @@ class FieldTypes(str, Enum):
     NESTED_DICT = "NestedDict"
     FILE = "file"
     PROMPT = "prompt"
+    OTHER = "other"
 
 
 SerializableFieldTypes = Annotated[FieldTypes, PlainSerializer(lambda v: v.value, return_type=str)]

src/backend/base/langflow/inputs/inputs.py

@@ -20,7 +20,7 @@ from .input_mixin import (
 
 class HandleInput(BaseInputMixin, ListableInputMixin):
     input_types: list[str] = Field(default_factory=list)
-    field_type: Optional[str] = ""
+    field_type: Optional[SerializableFieldTypes] = FieldTypes.OTHER
 
     @model_validator(mode="after")
     def validate_model_type(self):