Bugfix/Array Input Variables (#5196)

- Replace manual template variable processing in multiple components with a new utility function `processTemplateVariables`.

packages/components/nodes/agentflow/Retriever/Retriever.ts

@@ -8,6 +8,7 @@ import {
     IServerSideEventStreamer
 } from '../../../src/Interface'
 import { updateFlowState } from '../utils'
+import { processTemplateVariables } from '../../../src/utils'
 import { DataSource } from 'typeorm'
 import { BaseRetriever } from '@langchain/core/retrievers'
 import { Document } from '@langchain/core/documents'
@@ -197,14 +198,7 @@ class Retriever_Agentflow implements INode {
                 sseStreamer.streamTokenEvent(chatId, finalOutput)
             }
 
-            // Process template variables in state
-            if (newState && Object.keys(newState).length > 0) {
-                for (const key in newState) {
-                    if (newState[key].toString().includes('{{ output }}')) {
-                        newState[key] = newState[key].replaceAll('{{ output }}', finalOutput)
-                    }
-                }
-            }
+            newState = processTemplateVariables(newState, finalOutput)
 
             const returnOutput = {
                 id: nodeData.id,