✨ feat(loading.py): add support for new prompt templates in instantiate_prompt function

The config.yaml file has been updated to include new prompt templates. In types.py, the input_variables list was not being cleared when prompt or messages were present, which has been fixed. The instantiate_prompt function in loading.py has been updated to support the new prompt templates.
🔀 chore(config): add new prompt templates to config.yaml
🐛 fix(types.py): fix input_variables not being cleared when prompt or messages are present

src/backend/langflow/config.yaml

@@ -73,6 +73,11 @@ prompts:
   - PromptTemplate
   - FewShotPromptTemplate
   - ZeroShotPrompt
+  - ChatPromptTemplate
+  - SystemMessagePromptTemplate
+  - AIMessagePromptTemplate
+  - HumanMessagePromptTemplate
+  - ChatMessagePromptTemplate
 textsplitters:
   - CharacterTextSplitter
   - RecursiveCharacterTextSplitter

src/backend/langflow/graph/vertex/types.py

@@ -180,11 +180,17 @@ class PromptVertex(Vertex):
                 ]
             else:
                 prompt_params = ["template"]
-            for param in prompt_params:
-                prompt_text = self.params[param]
-                variables = extract_input_variables_from_prompt(prompt_text)
-                self.params["input_variables"].extend(variables)
-            self.params["input_variables"] = list(set(self.params["input_variables"]))
+
+            if "prompt" not in self.params and "messages" not in self.params:
+                for param in prompt_params:
+                    prompt_text = self.params[param]
+                    variables = extract_input_variables_from_prompt(prompt_text)
+                    self.params["input_variables"].extend(variables)
+                self.params["input_variables"] = list(
+                    set(self.params["input_variables"])
+                )
+            else:
+                self.params.pop("input_variables", None)
 
             self._build()
         return self._built_object

src/backend/langflow/interface/initialize/loading.py

@@ -97,6 +97,19 @@ def instantiate_prompt(node_type, class_object, params):
         if "tools" not in params:
             params["tools"] = []
         return ZeroShotAgent.create_prompt(**params)
+    if "MessagePromptTemplate" in node_type:
+        # Then we only need the template
+        from_template_params = {
+            "template": params.pop("prompt", params.pop("template", ""))
+        }
+
+        if not from_template_params.get("template"):
+            raise ValueError("Prompt template is required")
+        return class_object.from_template(**from_template_params)
+
+    if node_type == "ChatPromptTemplate":
+        return class_object.from_messages(**params)
+
     return class_object(**params)