first commit
This commit is contained in:
332
Inventory.md
Normal file
332
Inventory.md
Normal file
@@ -0,0 +1,332 @@
|
||||
# 📦 Complete Inventory Management System - Implementation Guide
|
||||
|
||||
## What You Get
|
||||
|
||||
✅ **Auto Stock Reduction** - Stock reduces when order delivered
|
||||
✅ **Low Stock Alerts** - Dashboard shows products needing restock
|
||||
✅ **Real Top Sellers** - Based on actual sales, not fake data
|
||||
✅ **Inventory Logs** - Track every stock change
|
||||
✅ **Stock Status** - OUT_OF_STOCK, CRITICAL, LOW, IN_STOCK
|
||||
|
||||
---
|
||||
|
||||
## 🚀 Setup (5 Steps)
|
||||
|
||||
### Step 1: Update Prisma Schema
|
||||
|
||||
Add this to your `schema.prisma`:
|
||||
|
||||
```prisma
|
||||
model InventoryLog {
|
||||
id String @id @default(cuid())
|
||||
|
||||
productId String
|
||||
productName String
|
||||
|
||||
type InventoryLogType
|
||||
quantityChange Int
|
||||
previousStock Int
|
||||
newStock Int
|
||||
|
||||
orderId String?
|
||||
adjustedBy String?
|
||||
notes String?
|
||||
|
||||
createdAt DateTime @default(now())
|
||||
|
||||
@@index([productId])
|
||||
@@index([orderId])
|
||||
@@index([type])
|
||||
@@map("inventory_logs")
|
||||
}
|
||||
|
||||
enum InventoryLogType {
|
||||
SOLD
|
||||
RESTOCK
|
||||
ADJUSTMENT
|
||||
RETURN
|
||||
DAMAGED
|
||||
}
|
||||
```
|
||||
|
||||
### Step 2: Run Migration
|
||||
|
||||
```bash
|
||||
npx prisma migrate dev --name add_inventory_logs
|
||||
```
|
||||
|
||||
### Step 3: Add Inventory Service
|
||||
|
||||
Create `src/services/inventoryService.js` with the provided code.
|
||||
|
||||
### Step 4: Update Order Controller
|
||||
|
||||
Replace your order controller with the version that includes auto stock reduction.
|
||||
|
||||
### Step 5: Update Dashboard Controller
|
||||
|
||||
Replace dashboard controller to show real top sellers + low stock alerts.
|
||||
|
||||
---
|
||||
|
||||
## 📊 Dashboard API Response
|
||||
|
||||
```json
|
||||
{
|
||||
"data": {
|
||||
"totalUsers": 150,
|
||||
"totalOrders": 450,
|
||||
"totalProducts": 89,
|
||||
"totalRevenue": 125000,
|
||||
|
||||
"inventory": {
|
||||
"totalProducts": 89,
|
||||
"outOfStock": 5,
|
||||
"criticalStock": 8,
|
||||
"lowStock": 12,
|
||||
"inStock": 64
|
||||
},
|
||||
|
||||
"topProducts": [
|
||||
{
|
||||
"_id": "prod123",
|
||||
"name": "Rare Rabbit",
|
||||
"basePrice": 2500,
|
||||
"totalSold": 45,
|
||||
"totalOrders": 32,
|
||||
"revenue": 112500,
|
||||
"stock": 12,
|
||||
"stockStatus": "LOW",
|
||||
"displayImage": "https://..."
|
||||
}
|
||||
],
|
||||
|
||||
"lowStockProducts": [
|
||||
{
|
||||
"_id": "prod456",
|
||||
"name": "Product Name",
|
||||
"stock": 3,
|
||||
"status": "CRITICAL",
|
||||
"basePrice": 1500,
|
||||
"displayImage": "https://..."
|
||||
}
|
||||
]
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## ⚙️ How Auto Stock Reduction Works
|
||||
|
||||
### When Admin Updates Order to DELIVERED:
|
||||
|
||||
```
|
||||
1. Admin: PUT /api/admin/orders/:id/status
|
||||
Body: { "status": "DELIVERED" }
|
||||
|
||||
2. Order Controller:
|
||||
✅ Updates order status
|
||||
✅ Creates status history
|
||||
✅ Calls reduceStockOnDelivery()
|
||||
|
||||
3. Inventory Service:
|
||||
✅ Gets order items
|
||||
✅ For each item:
|
||||
- Get product from MongoDB
|
||||
- Calculate: newStock = currentStock - quantity
|
||||
- Update product.stock in MongoDB
|
||||
- Create inventory log in PostgreSQL
|
||||
|
||||
4. Response:
|
||||
{
|
||||
"success": true,
|
||||
"message": "Order status updated",
|
||||
"stockReduction": [
|
||||
{
|
||||
"productName": "Rare Rabbit",
|
||||
"reduced": 1,
|
||||
"previousStock": 15,
|
||||
"newStock": 14
|
||||
}
|
||||
]
|
||||
}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 📋 Inventory Log Example
|
||||
|
||||
Every stock change creates a log:
|
||||
|
||||
```json
|
||||
{
|
||||
"id": "log123",
|
||||
"productId": "prod456",
|
||||
"productName": "Rare Rabbit",
|
||||
"type": "SOLD",
|
||||
"quantityChange": -1,
|
||||
"previousStock": 15,
|
||||
"newStock": 14,
|
||||
"orderId": "order789",
|
||||
"notes": "Order ORD1234567 delivered",
|
||||
"createdAt": "2026-02-11T14:30:00.000Z"
|
||||
}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 🎯 Stock Status Logic
|
||||
|
||||
```javascript
|
||||
stock === 0 → OUT_OF_STOCK (Red)
|
||||
stock <= 5 → CRITICAL (Orange)
|
||||
stock <= 10 → LOW (Yellow)
|
||||
stock > 10 → IN_STOCK (Green)
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 📊 Top Selling Products Logic
|
||||
|
||||
### OLD (Wrong):
|
||||
```javascript
|
||||
// ❌ Used purchaseCount from MongoDB (never updated)
|
||||
Product.find().sort({ purchaseCount: -1 })
|
||||
```
|
||||
|
||||
### NEW (Correct):
|
||||
```javascript
|
||||
// ✅ Query actual order data from PostgreSQL
|
||||
SELECT productId, SUM(quantity), COUNT(*)
|
||||
FROM order_items
|
||||
GROUP BY productId
|
||||
ORDER BY SUM(quantity) DESC
|
||||
|
||||
// ✅ Join with MongoDB for product details
|
||||
// ✅ Add stock info
|
||||
// ✅ Calculate revenue
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 🎨 Frontend Display
|
||||
|
||||
### Dashboard - Top Sellers
|
||||
|
||||
```javascript
|
||||
{topProducts.map(product => (
|
||||
<div key={product._id} className="flex items-center gap-4 p-4 bg-white rounded-lg shadow">
|
||||
<img src={product.displayImage} className="w-16 h-16 rounded" />
|
||||
<div className="flex-1">
|
||||
<h3 className="font-bold">{product.name}</h3>
|
||||
<div className="flex items-center gap-4 text-sm text-gray-600">
|
||||
<span>Sold: {product.totalSold}</span>
|
||||
<span>Revenue: ₹{product.revenue.toLocaleString()}</span>
|
||||
<span className={`px-2 py-1 rounded text-xs ${
|
||||
product.stockStatus === 'OUT_OF_STOCK' ? 'bg-red-100 text-red-800' :
|
||||
product.stockStatus === 'CRITICAL' ? 'bg-orange-100 text-orange-800' :
|
||||
product.stockStatus === 'LOW' ? 'bg-yellow-100 text-yellow-800' :
|
||||
'bg-green-100 text-green-800'
|
||||
}`}>
|
||||
{product.stock} in stock
|
||||
</span>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
))}
|
||||
```
|
||||
|
||||
### Dashboard - Low Stock Alerts
|
||||
|
||||
```javascript
|
||||
{lowStockProducts.length > 0 && (
|
||||
<div className="bg-orange-50 border border-orange-200 rounded-lg p-6">
|
||||
<h3 className="text-lg font-bold text-orange-900 mb-4">
|
||||
⚠️ Low Stock Alert ({lowStockProducts.length})
|
||||
</h3>
|
||||
<div className="space-y-3">
|
||||
{lowStockProducts.map(product => (
|
||||
<div key={product._id} className="flex items-center justify-between p-3 bg-white rounded">
|
||||
<div className="flex items-center gap-3">
|
||||
<img src={product.displayImage} className="w-12 h-12 rounded" />
|
||||
<div>
|
||||
<p className="font-semibold">{product.name}</p>
|
||||
<p className="text-sm text-gray-600">
|
||||
{product.stock === 0 ? 'Out of Stock' : `Only ${product.stock} left`}
|
||||
</p>
|
||||
</div>
|
||||
</div>
|
||||
<button className="px-4 py-2 bg-orange-600 text-white rounded">
|
||||
Restock
|
||||
</button>
|
||||
</div>
|
||||
))}
|
||||
</div>
|
||||
</div>
|
||||
)}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 🔧 Manual Stock Adjustment (Future)
|
||||
|
||||
```javascript
|
||||
// POST /api/admin/inventory/adjust
|
||||
{
|
||||
"productId": "prod123",
|
||||
"quantity": 50,
|
||||
"type": "ADD", // ADD, REMOVE, SET
|
||||
"notes": "Received new shipment"
|
||||
}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 📈 Benefits
|
||||
|
||||
1. **Accurate Inventory** - Always know real stock levels
|
||||
2. **Prevent Overselling** - Stock reduces on delivery
|
||||
3. **Early Warnings** - Low stock alerts
|
||||
4. **Better Planning** - See what's selling
|
||||
5. **Full Audit Trail** - Every change logged
|
||||
6. **Automated** - No manual work needed
|
||||
|
||||
---
|
||||
|
||||
## ✅ Testing Checklist
|
||||
|
||||
- [ ] Prisma migration ran successfully
|
||||
- [ ] Place test order
|
||||
- [ ] Mark order as DELIVERED
|
||||
- [ ] Check product stock reduced
|
||||
- [ ] Check inventory log created
|
||||
- [ ] Dashboard shows correct stock
|
||||
- [ ] Low stock products appear
|
||||
- [ ] Top sellers show real data
|
||||
|
||||
---
|
||||
|
||||
## 🎯 What Happens
|
||||
|
||||
### Before (Old System):
|
||||
```
|
||||
Order Delivered → Nothing happens
|
||||
Stock: Always same (never changes)
|
||||
Top Products: Fake/old data
|
||||
Dashboard: No inventory info
|
||||
```
|
||||
|
||||
### After (New System):
|
||||
```
|
||||
Order Delivered → Auto stock reduction
|
||||
Stock: Real-time accurate
|
||||
Top Products: Based on actual sales
|
||||
Dashboard: Full inventory overview
|
||||
Alerts: Low stock warnings
|
||||
Logs: Complete audit trail
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
**Your inventory system is now production-ready!** 📦✨
|
||||
Reference in New Issue
Block a user