Merhaba,

Product Model:

class Product extends Model
{ 
    protected $fillable = ["name", "name_second_line", "sub_name", "slug", "url", "code", "description", "keywords", "wide_description", "additional", "image", "suggested", "user_id", "how_to_order", 'sort', 'status', 'version_id', 'date', 'safe_id','package', 'material_id','surface'];

    public function categories(){
        return $this->belongsToMany(Category::class, 'product_categories', 'product_id', 'category_id');
    }
    
    public function versions()
    {
        return $this->belongsTo(Version::class, 'version_id');
    }
...}

Category Model:

class Category extends Model
{
    protected $fillable = ["title","slug", "description", "keywords", 'url', 'content', 'catalog', 'type', "category_id", "sort", "image", "status"];

    public function products(){
        return $this->belongsToMany(Product::class, 'product_categories', 'category_id', 'product_id')->where('products.status', 1);
    }

    public function categoryProducts(){
        return $this->hasMany('App\ProductCategory', "category_id", "id");
    }
...}

ProductCategory Model:

class ProductCategory extends Model
{
    protected $fillable = ["product_id", "category_id"];

    public function product()  
    { 
        return $this->belongsTo('App\Product', "product_id", "id", "version_id")->where('status', 1)->orderBy('sort', 'asc')->orderBy('id', 'asc');
        
    } 
    public function category()
    {
        return $this->belongsTo('App\Category', "category_id", "id");
    }
...}

CategoryController:

class CategoryController extends Controller  
{
    public function index($slug, Category $category, Request $request)
    {
        $category = $category->where('status', 1)->where("slug", $slug)->first();    

        $categoryProducts = $category->categoryProducts
        ->sortBy(function($category) {
            if(isset($category->product))
                 return $category->product->sort.'.'.$category->product->id;});

        $versions= Version:: all();

       $versionss=$request-> query('versi');

         return view("front.category.product", [
        "category" => $category, 
        "versions" => $versions,
        "categoryProducts"=>$categoryProducts,
        "versionss" =>$versionss
    ]);
    }
...}

Product.Blade:

  <div class="row">            
        <div class="col-md-2">     
            <button type="submit"> Search </button> <br>           
                @foreach($versions as $version)
                    <input type="checkbox" value="{{ $version->id }}" id="{{$version->id}}" name="versi" >
                    <label >{{ $version->name }}</label><br>                       
                @endforeach
        </div>
            <div class="col-md-10">
                    <div class="product-list">
                        <div class="row">            
                            @if(isset($category->categoryProducts) && count($category->categoryProducts)>0)                            
                                @if(empty($versin))
                                    @foreach($categoryProducts as $categoryProduct)
                                        @if(isset($categoryProduct->product))                                
                                            <div class="col-md-6 col-lg-4">
                                                <div class="product">
                                                    <a href="{{ StringHelper::product_show_url($categoryProduct->product) }}">
                                                        <span class="product-title">{{ $categoryProduct->product->code }}</span> 
                                                        <span class="name">{{ $categoryProduct->product->name }}</span>
                                                    </a> 
                                                </div>
                                            </div>  
                                
                                        @endif
                                    @endforeach
                            
                                @else 

                                <p>Seçtiğim markayla eşleşen ürünler</p>

                                @endif

                            @else
                                There is no product.
                            @endif
                                             
                        </div><!-- /.row -->
                    </div><!-- /.product-list -->
                </div>          
            </div><!-- /.row -->
        </div><!-- /.container -->
        </form>
    </div><!-- /.main-wrapper -->
...

Site de kategoriye girdigim zaman ürünlerim gelmektedir. Fakat filtrelemeye calistigimda versionlar(audi, bmw,) ilgili ürünleri getiremedim. $versionss=$request-> query('versi'); şununla almaya çalışıyorum seçtiğim değeri fakat ilişkili bir model yapısına sahip olduğumdan bir türlü yoluna koyamadım. İlgili modelim controller ve blade yukarıdaki şekildedir. Yardımlarınızı rica ediyorum.