問題：
聊天觸發器節點未向下一個節點傳遞訊息
但當我直接向 Q&A 鏈發送訊息時，就能取得答案
我使用的是最新版本的 n8n，以 Docker 映像自行託管在 railway.app
程式碼：
{
“nodes”: [
{
“parameters”: {
“authentication”: “chromaCloudApi”,
“chromaCollection”: {
“__rl”: true,
“value”: “diabetes_care_2026_pdf”,
“mode”: “list”,
“cachedResultName”: “diabetes_care_2026_pdf”
},
“options”: {}
},
“type”: “@n8n/n8n-nodes-langchain.vectorStoreChromaDB”,
“typeVersion”: 1.3,
“position”: [
640,
-96
],
“id”: “6bcbcabb-1628-4705-acc1-ec69e9cdd2ea”,
“name”: “Chroma Vector Store”,
“notesInFlow”: true,
“credentials”: {
“chromaCloudApi”: {
“id”: “GJVxnKM6boNKGDcQ”,
“name”: “ChromaDB Cloud”
}
}
},
{
“parameters”: {
“options”: {}
},
“type”: “@n8n/n8n-nodes-langchain.embeddingsOpenAi”,
“typeVersion”: 1.2,
“position”: [
512,
-32
],
“id”: “53369344-d75a-4e1b-8cbe-7e330ada84e7”,
“name”: “Embeddings OpenAI”,
“credentials”: {
“openAiApi”: {
“id”: “U8c47VlPDVe4QvHM”,
“name”: “OpenAI account”
}
}
},
{
“parameters”: {
“model”: {
“__rl”: true,
“value”: “gpt-4o-mini”,
“mode”: “list”,
“cachedResultName”: “gpt-4o-mini”
},
“builtInTools”: {},
“options”: {
“textFormat”: {
“textOptions”: {
“type”: “text”
}
}
}
},
“type”: “@n8n/n8n-nodes-langchain.lmChatOpenAi”,
“typeVersion”: 1.3,
“position”: [
368,
-144
],
“id”: “85a2a69d-b7f5-43a0-9761-94f58981658e”,
“name”: “OpenAI Chat Model”,
“credentials”: {
“openAiApi”: {
“id”: “U8c47VlPDVe4QvHM”,
“name”: “OpenAI account”
}
}
},
{
“parameters”: {
“options”: {
“responseMode”: “lastNode”
}
},
“type”: “@n8n/n8n-nodes-langchain.chatTrigger”,
“typeVersion”: 1.4,
“position”: [
176,
-384
],
“id”: “2a23a459-2e0a-41e2-b42f-3f7dc8e457ce”,
“name”: “When chat message received”,
“webhookId”: “fb089fe6-d959-4530-8e15-b76291e07d0f”,
“alwaysOutputData”: false
},
{
“parameters”: {},
“type”: “@n8n/n8n-nodes-langchain.retrieverVectorStore”,
“typeVersion”: 1,
“position”: [
560,
-256
],
“id”: “8f040c30-62c4-4655-aec0-dd8db30f5575”,
“name”: “Vector Store Retriever”
},
{
“parameters”: {
“options”: {}
},
“type”: “@n8n/n8n-nodes-langchain.chainRetrievalQa”,
“typeVersion”: 1.7,
“position”: [
400,
-384
],
“id”: “5abff650-028a-4dae-8859-00b3fc45f1ea”,
“name”: “Question and Answer Chain”
}
],
“connections”: {
“Chroma Vector Store”: {
“ai_tool”: [
],
“ai_vectorStore”: [
[
{
“node”: “Vector Store Retriever”,
“type”: “ai_vectorStore”,
“index”: 0
}
]
]
},
“Embeddings OpenAI”: {
“ai_embedding”: [
[
{
“node”: “Chroma Vector Store”,
“type”: “ai_embedding”,
“index”: 0
}
]
]
},
“OpenAI Chat Model”: {
“ai_languageModel”: [
[
{
“node”: “Question and Answer Chain”,
“type”: “ai_languageModel”,
“index”: 0
}
]
]
},
“When chat message received”: {
“main”: [
[
{
“node”: “Question and Answer Chain”,
“type”: “main”,
“index”: 0
}
]
]
},
“Vector Store Retriever”: {
“ai_retriever”: [
[
{
“node”: “Question and Answer Chain”,
“type”: “ai_retriever”,
“index”: 0
}
]
]
},
“Question and Answer Chain”: {
“main”: [
]
}
},
“pinData”: {},
“meta”: {
“templateCredsSetupCompleted”: true,
“instanceId”: “e80c933fa7f4d5967cc2a038c97a89862a2e4ccb4b18372a6ce2a883e1398a68”
}
}
