How to Build an Inventory Management System in Bubble.io
Excel-based inventory management breaks down at the worst moment. A custom Bubble inventory system takes 2-3 weeks: complete stock ledger data model, reorder alerts, purchase order management, and barcode scanning — built for exactly how your business tracks stock.
Replacing Excel With a Purpose-Built System
Small and medium businesses manage inventory in Excel spreadsheets until the pain of lost stock, ordering errors, and manual counting becomes unsustainable. At that point, enterprise inventory systems are too complex and expensive, and general-purpose tools don’t fit the specific workflow. A custom Bubble inventory management system takes 2-3 weeks to build and fits exactly how the business tracks stock, receives deliveries, and fulfils orders.
Core Types for Any Stock Management System
Product
sku
: text (unique stock-keeping unit)
name, description
: text
category
: option set
unit
: option set (Each / Box / Kg / Litre)
current_stock
: number (denormalised; updated on every movement)
reorder_point
: number (trigger reorder alert below this level)
reorder_quantity
: number (how much to order)
supplier
-> Supplier
unit_cost
: number
unit_price
: number (selling price)
StockMovement
(the ledger; every change is a movement)
product
-> Product
type
: option set (Received / Sold / Adjusted / Returned / Damaged)
quantity
: number (positive = in; negative = out)
reference
: text (PO number, order ID, or adjustment reason)
created_by
: User
created_at
: date
// Current stock = sum of all StockMovements for this Product
// But store as denormalised field on Product for fast display
// Update on every StockMovement creation
What a Complete Inventory System Includes
Stock Level Dashboard
All products with current stock level, colour-coded: green (above reorder point), amber (at or near reorder point), red (below reorder point or zero). Sorted by urgency. One-click to create a purchase order from the amber/red items. The feature that prevents stockouts.
Purchase Order Management
Create a purchase order to a supplier with line items (products and quantities). Send confirmation email to supplier automatically. When goods arrive: receive the PO, update stock levels, and close the PO. Partial receipts handled by partial quantity confirmation.
Stock Movement Ledger
Every stock change recorded as a StockMovement. The ledger is the audit trail: what changed, when, by whom, and why. Sortable and filterable by product, date, and movement type. Essential for investigating discrepancies and shrinkage.
Reorder Alerts
Scheduled backend workflow runs daily. For each Product where current_stock <= reorder_point: create a ReorderAlert record and send notification to the purchasing manager. Alert resolves automatically when stock is replenished above the reorder point.
Barcode Scanning
Use a barcode scanner (USB or mobile camera via the Camera plugin) to identify products by SKU barcode. Scan to receive, scan to fulfil, scan to adjust. Eliminates manual search and typing errors. The feature that professional operations teams expect.
Valuation Report
Total inventory value = sum of (current_stock x unit_cost) per product. Monthly report of opening value, received value, sold value, and closing value. Required for accounting and business planning. Read from StockMovement ledger with cost price per movement.
Keeping Stock Accurate
Step 1
: Create StockMovement:
product = received product,
type = Received,
quantity = received quantity (positive)
Step 2
: Update Product:
current_stock = current_stock + received quantity
// When stock is sold or consumed
Step 1
: Only when Product’s current_stock >= order quantity
Step 2
: Create StockMovement:
product = sold product, type = Sold, quantity = order quantity (positive stored, subtract on display)
Step 3
: Update Product: current_stock = current_stock – order quantity
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