🐛 fix(base.py): change frontend_node field in ValidatePromptRequest to use FrontendNodeRequest instead of FrontendNode

🔥 chore(base.py): remove unused FrontendNodeRequest class
🔨 refactor(validate.py): modify post_validate_prompt function to update the template field in the frontend_node object
The ValidatePromptRequest class was using the FrontendNode class instead of the FrontendNodeRequest class, which caused an error. The unused FrontendNodeRequest class was removed. The post_validate_prompt function was modified to update the template field in the frontend_node object instead of appending to the fields list.

src/backend/langflow/api/v1/base.py

@@ -13,9 +13,13 @@ class Code(BaseModel):
     code: str
 
 
+class FrontendNodeRequest(FrontendNode):
+    template: dict
+
+
 class ValidatePromptRequest(BaseModel):
     template: str
-    frontend_node: FrontendNode
+    frontend_node: FrontendNodeRequest
 
 
 # Build ValidationResponse class for {"imports": {"errors": []}, "function": {"errors": []}}
@@ -34,7 +38,7 @@ class CodeValidationResponse(BaseModel):
 
 class PromptValidationResponse(BaseModel):
     input_variables: list
-    frontend_node: FrontendNode
+    frontend_node: FrontendNodeRequest
 
 
 INVALID_CHARACTERS = {

src/backend/langflow/api/v1/validate.py

@@ -36,7 +36,8 @@ def post_validate_prompt(prompt: ValidatePromptRequest):
                 template_field = TemplateField(
                     name=variable, field_type="str", show=True, advanced=False
                 )
-                prompt.frontend_node.template.fields.append(template_field)
+
+                prompt.frontend_node.template[variable] = template_field.dict()
                 prompt.frontend_node.custom_fields.append(variable)
             except Exception as exc:
                 logger.exception(exc)