Automate AI-Powered RAG System with Contextual Q&A, Google Sheets Integration, and Glide Frontend—Powered by n8n, OpenA…
Automate AI-Powered RAG System with Contextual Q&A, Google Sheets Integration, and Glide Frontend—Powered by n8n, OpenAI, Supabase, and Google Apps Script. Tools & Services Used Glide (Frontend for user interactions) Google Sheets (Stores questions and answers) Google Apps Script (Forms + media upload handling) OpenAI (Embeddings + GPT-4 to rank and generate answers) Supabase (Optional for image hosting) n8n (Automation logic and backend glue) Workflow Overview This automation performs the following steps: Trigger: Webhook receives a user question from a Glide frontend. Fetch Data: Retrieves Q&A entries (and optionally, image URLs) from a connected Google Sheet. Rank Relevance: OpenAI Embeddings rank the relevance of stored questions to the new input. Top matches are passed to a GPT-4 prompt for answer generation. Generate Answer: GPT-4 creates a contextual answer using the best match. Optional: Includes media URL if attached to the matched answer. Response: Sends the formatted answer back to Glide frontend (text + optional image). Prerequisites Active accounts and API keys for: OpenAI (API key with GPT-4 and embedding access) Google Sheets (linked via Service Account or OAuth2 credentials) Glide App (with a form to submit questions) Supabase (optional, if hosting user-uploaded media) n8n Self-hosted (for community nodes and webhook access) How to Use This Template Step 1: Import the Template Upload the provided JSON into your self-hosted n8n instance. Requires installation of the Community Node: @n8n/n8n-nodes-openai-embeddings Step 2: Configure Credentials Webhook Trigger: Replace the Glide webhook URL with your actual endpoint from your app. Google Sheets Node: Set the spreadsheet ID and worksheet name to fetch your Q&A dataset. OpenAI Nodes: Insert your OpenAI API key. Confirm that both text-embedding-ada-002 (or similar) and gpt-4 are available. Supabase or Apps Script (Optional): Ensure image links are correctly formed in the Sheet. Step 3: Customize Prompts and Thresholds Update the OpenAI ranking prompt or similarity threshold in the Function or Code node. Tailor GPT-4 prompts to return concise or detailed answers based on your use case. Initial Test Run Simulate a Question: Trigger the Glide form with a sample question. Check n8n logs for: Matching score/ranking success Correct retrieval from Sheets GPT-4 answer generation Image URL handling (if enabled) Production Prep Add error-handling nodes for cases when Sheets are empty or GPT-4 fails. Set up logging via Google Sheets, Supabase, or external database. Rate-limit or debounce requests from Glide if needed. Use Cases Customer Support Portals: Offer instant Q&A with your business data. Internal Knowledgebase: Employees can query training manuals and SOPs. AI Concierge: Combine structured answers with friendly tone for guest interactions. Disclaimer Validate Glide form inputs before full deployment. Ensure your OpenAI and Google Sheets usage stays within quota limits. An n8n automation workflow template by Sam Yassine.
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