erpsaas/app/Models/Item.php

<?php

namespace App\Models;

use App\Models\Document\DocumentItem;
use App\Models\Setting\Category;
use App\Models\Setting\Discount;
use App\Models\Setting\Tax;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Wallo\FilamentCompanies\FilamentCompanies;

class Item extends Model
{
    use HasFactory;

    protected $table = 'items';

    protected $fillable = [
        'company_id',
        'type',
        'name',
        'sku',
        'description',
        'sale_price',
        'purchase_price',
        'quantity',
        'category_id',
        'tax_id',
        'discount_id',
        'enabled',
        'created_by',
    ];

    protected $casts = [
        'enabled' => 'boolean',
    ];

    public function company(): BelongsTo
    {
        return $this->belongsTo(FilamentCompanies::companyModel(), 'company_id');
    }

    public function createdBy(): BelongsTo
    {
        return $this->belongsTo(FilamentCompanies::userModel(), 'created_by');
    }

    public function category(): BelongsTo
    {
        return $this->belongsTo(Category::class, 'category_id')->withDefault([
            'name' => 'General',
        ]);
    }

    public function tax(): BelongsTo
    {
        return $this->belongsTo(Tax::class, 'tax_id');
    }

    public function discount(): BelongsTo
    {
        return $this->belongsTo(Discount::class, 'discount_id');
    }

    public function document_items(): HasMany
    {
        return $this->hasMany(DocumentItem::class);
    }

    public function bill_items(): HasMany
    {
        return $this->document_items()->where('type', 'bill');
    }

    public function invoice_items(): HasMany
    {
        return $this->document_items()->where('type', 'invoice');
    }
}