🔨 refactor(base.py): add LLMCheckerChain to from_method_nodes dictionary

🔨 refactor(chains.py): comment out unused code block
The `from_method_nodes` dictionary in `base.py` has been updated to include the `LLMCheckerChain` class. This allows the `from_llm` method to be called on the `LLMCheckerChain` class.

The code block in `chains.py` that deals with the `PromptTemplate` field type has been commented out as it is currently unused. This is to prevent confusion and to keep the codebase clean.

src/backend/langflow/interface/chains/base.py

@@ -20,7 +20,10 @@ class ChainCreator(LangChainTypeCreator):
         return ChainFrontendNode
 
     #! We need to find a better solution for this
-    from_method_nodes = {"ConversationalRetrievalChain": "from_llm"}
+    from_method_nodes = {
+        "ConversationalRetrievalChain": "from_llm",
+        "LLMCheckerChain": "from_llm",
+    }
 
     @property
     def type_to_loader_dict(self) -> Dict:

src/backend/langflow/template/frontend_node/chains.py

@@ -33,6 +33,14 @@ class ChainFrontendNode(FrontendNode):
             field.show = True
             field.advanced = True
 
+        # We should think of a way to deal with this later
+        # if field.field_type == "PromptTemplate":
+        #     field.field_type = "str"
+        #     field.multiline = True
+        #     field.show = True
+        #     field.advanced = False
+        #     field.value = field.value.template
+
         # Separated for possible future changes
         if field.name == "prompt" and field.value is None:
             field.required = True