fix: Dict Input Validation issue in Dynamic Components (#7754)

* Update inputs.py

* update dict validation approach

* [autofix.ci] apply automated fixes

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

src/backend/base/langflow/api/utils.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import uuid
+from ast import literal_eval
 from datetime import timedelta
 from enum import Enum
 from typing import TYPE_CHECKING, Annotated, Any
@@ -280,11 +281,18 @@ def get_suggestion_message(outdated_components: list[str]) -> str:
 def parse_value(value: Any, input_type: str) -> Any:
     """Helper function to parse the value based on input type."""
     if value == "":
-        return value
+        return {} if input_type == "DictInput" else value
     if input_type == "IntInput":
         return int(value) if value is not None else None
     if input_type == "FloatInput":
         return float(value) if value is not None else None
+    if input_type == "DictInput":
+        if isinstance(value, dict):
+            return value
+        try:
+            return literal_eval(value) if value is not None else {}
+        except (ValueError, SyntaxError):
+            return {}
     return value
 
 

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

@@ -458,7 +458,9 @@ class DictInput(BaseInputMixin, ListableInputMixin, InputTraceMixin, ToolModeMix
     """
 
     field_type: SerializableFieldTypes = FieldTypes.DICT
-    value: dict | None = {}
+    # Note do not set value to an empty dict, it will break the component in dynamic update build config
+    # value: dict | None = {}
+    value: dict = Field(default_factory=dict)
 
 
 class DropdownInput(BaseInputMixin, DropDownMixin, MetadataTraceMixin, ToolModeMixin):