star-erp/app/Models/Product.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class Product extends Model
{
    use HasFactory, SoftDeletes;

    protected $fillable = [
        'code',
        'name',
        'category_id',
        'brand',
        'specification',
        'base_unit_id',
        'large_unit_id',
        'conversion_rate',
        'purchase_unit_id',
    ];

    protected $casts = [
        'conversion_rate' => 'decimal:4',
    ];

    /**
     * Get the category that owns the product.
     */
    public function category(): BelongsTo
    {
        return $this->belongsTo(Category::class);
    }

    public function baseUnit(): BelongsTo
    {
        return $this->belongsTo(Unit::class, 'base_unit_id');
    }

    public function largeUnit(): BelongsTo
    {
        return $this->belongsTo(Unit::class, 'large_unit_id');
    }

    public function purchaseUnit(): BelongsTo
    {
        return $this->belongsTo(Unit::class, 'purchase_unit_id');
    }

    public function vendors(): \Illuminate\Database\Eloquent\Relations\BelongsToMany
    {
        return $this->belongsToMany(Vendor::class)->withPivot('last_price')->withTimestamps();
    }

    public function inventories(): \Illuminate\Database\Eloquent\Relations\HasMany
    {
        return $this->hasMany(Inventory::class);
    }

    public function warehouses(): \Illuminate\Database\Eloquent\Relations\BelongsToMany
    {
        return $this->belongsToMany(Warehouse::class, 'inventories')
            ->withPivot(['quantity', 'safety_stock', 'location'])
            ->withTimestamps();
    }
}