About this recipe
A recipe for Chatgpt Automatic Code Review In Gitlab Mr
Recipe Template
{
"nodes": [
{
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
880,
540
],
"parameters": {
"content": "## Edit your own prompt \u2b07\ufe0f\n"
},
"typeVersion": 1
},
{
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
-380,
580
],
"parameters": {
"content": "## Filter comments and customize your trigger words \u2b07\ufe0f"
},
"typeVersion": 1
},
{
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
-120,
560
],
"parameters": {
"content": "## Replace your gitlab URL and token \u2b07\ufe0f"
},
"typeVersion": 1
},
{
"name": "Webhook",
"type": "n8n-nodes-base.webhook",
"position": [
-540,
760
],
"webhookId": "6cfd2f23-6f45-47d4-9fe0-8f6f1c05829a",
"parameters": {
"path": "e21095c0-1876-4cd9-9e92-a2eac737f03e",
"options": [],
"httpMethod": "POST"
},
"typeVersion": 1.1
},
{
"name": "Code",
"type": "n8n-nodes-base.code",
"position": [
720,
540
],
"parameters": {
"mode": "runOnceForEachItem",
"jsCode": "\/\/ Loop over input items and add a new field called 'myNewField' to the JSON of each one\nvar diff = $input.item.json.gitDiff\n\nlet lines = diff.trimEnd().split('\\n');\n\nlet originalCode = '';\nlet newCode = '';\n\nlines.forEach(line => {\n console.log(line)\n if (line.startsWith('-')) {\n originalCode += line + \"\\n\";\n } else if (line.startsWith('+')) {\n newCode += line + \"\\n\";\n } else {\n originalCode += line + \"\\n\";\n newCode += line + \"\\n\";\n }\n});\n\nreturn {\n originalCode:originalCode,\n newCode:newCode\n};\n\n"
},
"typeVersion": 2
},
{
"name": "Split Out1",
"type": "n8n-nodes-base.splitOut",
"position": [
140,
740
],
"parameters": {
"options": [],
"fieldToSplitOut": "changes"
},
"typeVersion": 1
},
{
"name": "OpenAI Chat Model1",
"type": "@n8n\/n8n-nodes-langchain.lmChatOpenAi",
"position": [
900,
860
],
"parameters": {
"options": {
"baseURL": ""
}
},
"typeVersion": 1
},
{
"name": "Get Changes1",
"type": "n8n-nodes-base.httpRequest",
"position": [
-60,
740
],
"parameters": {
"url": "=https:\/\/gitlab.com\/api\/v4\/projects\/{{ $json[\"body\"][\"project_id\"] }}\/merge_requests\/{{ $json[\"body\"][\"merge_request\"][\"iid\"] }}\/changes",
"options": [],
"sendHeaders": true,
"headerParameters": {
"parameters": [
{
"name": "PRIVATE-TOKEN"
}
]
}
},
"typeVersion": 4.1
},
{
"name": "Skip File Change1",
"type": "n8n-nodes-base.if",
"position": [
340,
740
],
"parameters": {
"options": [],
"conditions": {
"options": {
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"operator": {
"type": "boolean",
"operation": "false",
"singleValue": true
},
"leftValue": "={{ $json.renamed_file }}",
"rightValue": ""
},
{
"operator": {
"type": "boolean",
"operation": "false",
"singleValue": true
},
"leftValue": "={{ $json.deleted_file }}",
"rightValue": ""
},
{
"operator": {
"type": "string",
"operation": "startsWith"
},
"leftValue": "={{ $json.diff }}",
"rightValue": "@@"
}
]
}
},
"typeVersion": 2
},
{
"name": "Parse Last Diff Line1",
"type": "n8n-nodes-base.code",
"position": [
540,
540
],
"parameters": {
"mode": "runOnceForEachItem",
"jsCode": "const parseLastDiff = (gitDiff) => {\n gitDiff = gitDiff.replace(\/\\n\\\\ No newline at end of file\/, '')\n \n const diffList = gitDiff.trimEnd().split('\\n').reverse();\n const lastLineFirstChar = diffList?.[0]?.[0];\n const lastDiff =\n diffList.find((item) => {\n return \/^@@ \\-\\d+,\\d+ \\+\\d+,\\d+ @@\/g.test(item);\n }) || '';\n\n const [lastOldLineCount, lastNewLineCount] = lastDiff\n .replace(\/@@ \\-(\\d+),(\\d+) \\+(\\d+),(\\d+) @@.*\/g, ($0, $1, $2, $3, $4) => {\n return `${+$1 + +$2},${+$3 + +$4}`;\n })\n .split(',');\n \n if (!\/^\\d+$\/.test(lastOldLineCount) || !\/^\\d+$\/.test(lastNewLineCount)) {\n return {\n lastOldLine: -1,\n lastNewLine: -1,\n gitDiff,\n };\n }\n\n\n const lastOldLine = lastLineFirstChar === '+' ? null : (parseInt(lastOldLineCount) || 0) - 1;\n const lastNewLine = lastLineFirstChar === '-' ? null : (parseInt(lastNewLineCount) || 0) - 1;\n\n return {\n lastOldLine,\n lastNewLine,\n gitDiff,\n };\n};\n\nreturn parseLastDiff($input.item.json.diff)\n"
},
"typeVersion": 2
},
{
"name": "Post Discussions1",
"type": "n8n-nodes-base.httpRequest",
"position": [
1280,
720
],
"parameters": {
"url": "=https:\/\/gitlab.com\/api\/v4\/projects\/{{ $('Webhook').item.json[\"body\"][\"project_id\"] }}\/merge_requests\/{{ $('Webhook').item.json[\"body\"][\"merge_request\"][\"iid\"] }}\/discussions",
"method": "POST",
"options": [],
"sendBody": true,
"contentType": "multipart-form-data",
"sendHeaders": true,
"bodyParameters": {
"parameters": [
{
"name": "body",
"value": "={{ $('Basic LLM Chain1').item.json[\"text\"] }}"
},
{
"name": "position[position_type]",
"value": "text"
},
{
"name": "position[old_path]",
"value": "={{ $('Split Out1').item.json.old_path }}"
},
{
"name": "position[new_path]",
"value": "={{ $('Split Out1').item.json.new_path }}"
},
{
"name": "position[start_sha]",
"value": "={{ $('Get Changes1').item.json.diff_refs.start_sha }}"
},
{
"name": "position[head_sha]",
"value": "={{ $('Get Changes1').item.json.diff_refs.head_sha }}"
},
{
"name": "position[base_sha]",
"value": "={{ $('Get Changes1').item.json.diff_refs.base_sha }}"
},
{
"name": "position[new_line]",
"value": "={{ $('Parse Last Diff Line1').item.json.lastNewLine || '' }}"
},
{
"name": "position[old_line]",
"value": "={{ $('Parse Last Diff Line1').item.json.lastOldLine || '' }}"
}
]
},
"headerParameters": {
"parameters": [
{
"name": "PRIVATE-TOKEN"
}
]
}
},
"typeVersion": 4.1
},
{
"name": "Need Review1",
"type": "n8n-nodes-base.if",
"position": [
-320,
760
],
"parameters": {
"options": [],
"conditions": {
"options": {
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"operator": {
"name": "filter.operator.equals",
"type": "string",
"operation": "equals"
},
"leftValue": "={{ $json.body.object_attributes.note }}",
"rightValue": "+0"
}
]
}
},
"typeVersion": 2
},
{
"name": "Basic LLM Chain1",
"type": "@n8n\/n8n-nodes-langchain.chainLlm",
"position": [
880,
720
],
"parameters": {
"prompt": "=File path\uff1a{{ $('Skip File Change1').item.json.new_path }}\n\n```Original code\n {{ $json.originalCode }}\n```\nchange to\n```New code\n {{ $json.newCode }}\n```\nPlease review the code changes in this section:",
"messages": {
"messageValues": [
{
"message": "# Overview:\n You are a senior programming expert Bot, responsible for reviewing code changes and providing review recommendations.\n At the beginning of the suggestion, it is necessary to clearly make a decision to \"reject\" or \"accept\" the code change, and rate the change in the format \"Change Score: Actual Score\", with a score range of 0-100 points.\n Then, point out the existing problems in concise language and a stern tone.\n If you feel it is necessary, you can directly provide the modified content.\n Your review proposal must use rigorous Markdown format."
}
]
}
},
"typeVersion": 1.2
},
{
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
1200,
540
],
"parameters": {
"content": "## Replace your gitlab URL and token \u2b07\ufe0f"
},
"typeVersion": 1
}
],
"pinData": [],
"connections": {
"Code": {
"main": [
[
{
"node": "Basic LLM Chain1",
"type": "main",
"index": 0
}
]
]
},
"Webhook": {
"main": [
[
{
"node": "Need Review1",
"type": "main",
"index": 0
}
]
]
},
"Split Out1": {
"main": [
[
{
"node": "Skip File Change1",
"type": "main",
"index": 0
}
]
]
},
"Get Changes1": {
"main": [
[
{
"node": "Split Out1",
"type": "main",
"index": 0
}
]
]
},
"Need Review1": {
"main": [
[
{
"node": "Get Changes1",
"type": "main",
"index": 0
}
]
]
},
"Basic LLM Chain1": {
"main": [
[
{
"node": "Post Discussions1",
"type": "main",
"index": 0
}
]
]
},
"Skip File Change1": {
"main": [
[
{
"node": "Parse Last Diff Line1",
"type": "main",
"index": 0
}
]
]
},
"OpenAI Chat Model1": {
"ai_languageModel": [
[
{
"node": "Basic LLM Chain1",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Parse Last Diff Line1": {
"main": [
[
{
"node": "Code",
"type": "main",
"index": 0
}
]
]
}
}
}How to Use an n8n Template
1
Create a New Workflow
Click "New Workflow" in your n8n dashboard to get started.
2
Copy & Paste Template
First, copy this template:
Click here to copy the JSON
.
Then, in n8n, click the three dots (···) → "Import from file" and paste the JSON code.
3
Customize the Nodes
Go through each node in the workflow to update inputs like spreadsheet IDs, email addresses, or message content. Adjust field mappings to match your data.
4
Grant Access
For nodes that connect to external apps (like Google Sheets or Slack), you'll need to grant access. Connect your accounts using OAuth or an API key and save the credentials in the node.
5
Test It
Run the workflow by clicking "Execute Node" for each step or "Run Once" for the whole thing. Check the right sidebar to inspect data and debug any errors (they'll show up in red).
6
Activate Workflow
Once everything works as expected, click the "Activate" toggle to turn your workflow on. You're all set!