first commit

app/Models/Inventory.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Inventory extends Model
+{
+    /** @use HasFactory<\Database\Factories\InventoryFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'warehouse_id',
+        'product_id',
+        'quantity',
+        'safety_stock',
+        'location',
+    ];
+
+    public function warehouse(): \Illuminate\Database\Eloquent\Relations\BelongsTo
+    {
+        return $this->belongsTo(Warehouse::class);
+    }
+
+    public function product(): \Illuminate\Database\Eloquent\Relations\BelongsTo
+    {
+        return $this->belongsTo(Product::class);
+    }
+
+    public function transactions(): \Illuminate\Database\Eloquent\Relations\HasMany
+    {
+        return $this->hasMany(InventoryTransaction::class);
+    }
+
+    public function lastOutgoingTransaction()
+    {
+        return $this->hasOne(InventoryTransaction::class)->ofMany([
+            'actual_time' => 'max',
+            'id' => 'max',
+        ], function ($query) {
+            $query->where('quantity', '<', 0);
+        });
+    }
+
+    public function lastIncomingTransaction()
+    {
+        return $this->hasOne(InventoryTransaction::class)->ofMany([
+            'actual_time' => 'max',
+            'id' => 'max',
+        ], function ($query) {
+            $query->where('quantity', '>', 0);
+        });
+    }
+}