laravel過濾器，如果else語句不起作用

Question

我嘗試按價格性別顏色過濾產品，這是當我使用類似url localhost / category / tag？price = 100的工作代碼

if (request()->has('gender')) {
     $products = Product::withAllTags($tags)->where('gender', request('gender'))->get();
  }
  if (request()->has('price')) {
     $products = Product::withAllTags($tags)->where('price', '<=', request('price'))->get();
  }
  if (request()->has('color')) {
     $products = Product::withAllTags($tags)->whereHas('colors', function ($query) {
          $query->where('name', request('color'));
      })->paginate(20);
  }
  if (request()->has('brand')) {
     $products = Product::withAllTags($tags)->whereHas('brands', function ($query) {
          $query->where('name', request('brand'));
      })->orderBy('created_at', 'desc')->paginate(20);
  }

但在url為localhost / category / tag時出現錯誤

Undefined variable: products

我嘗試添加其他條件

if (request()->has('gender')) {
     $products = Product::withAllTags($tags)->where('gender', request('gender'))->get();
  }
  if (request()->has('price')) {
     $products = Product::withAllTags($tags)->where('price', '<=', request('price'))->get();
  }
  if (request()->has('color')) {
     $products = Product::withAllTags($tags)->whereHas('colors', function ($query) {
          $query->where('name', request('color'));
      })->paginate(20);
  }
  if (request()->has('brand')) {
     $products = Product::withAllTags($tags)->whereHas('brands', function ($query) {
          $query->where('name', request('brand'));
      })->orderBy('created_at', 'desc')->paginate(20);
  }

  else  {
     $products = Product::withAllTags($tags)->orderBy('created_at', 'desc')->paginate(20);
    }  

它在localhost / category / tag上工作，但現在過濾器在localhost / category / tag上不工作？price = 100所有數據都對我的語法表示抱歉

Answer 1

你基本上是在做

if (request()->has('brand')) {
     $products = Product::withAllTags($tags)->whereHas('brands', function ($query) {
          $query->where('name', request('brand'));
      })->orderBy('created_at', 'desc')->paginate(20);
  }

  else  {
     $products = Product::withAllTags($tags)->orderBy('created_at', 'desc')->paginate(20);
    }  

這使得else語句適用於request()->has('brand')將所有條件包裝在if語句中，其余部分包裝在else語句中

if(request()->has('gender')||request()->has('price')||request()->has('color')||request()->has('brand')){
if (request()->has('gender')) {
     $products = Product::withAllTags($tags)->where('gender', request('gender'))->get();
  }
  if (request()->has('price')) {
     $products = Product::withAllTags($tags)->where('price', '<=', request('price'))->get();
  }
  if (request()->has('color')) {
     $products = Product::withAllTags($tags)->whereHas('colors', function ($query) {
          $query->where('name', request('color'));
      })->paginate(20);
  }
  if (request()->has('brand')) {
     $products = Product::withAllTags($tags)->whereHas('brands', function ($query) {
          $query->where('name', request('brand'));
      })->orderBy('created_at', 'desc')->paginate(20);
  }
}
  else  {
     $products = Product::withAllTags($tags)->orderBy('created_at', 'desc')->paginate(20);
    }