Laravel：如何通过路由变量指定分页中的项目数

Question

我希望更改通过分页显示的项目数量，通过以下路由在控制器中指定，以设置在每个分页页面上显示的产品数量。

例如，如果用户输入http://example.com/first-category?numProducts=99，他们将看到'pages.category' 视图，分页的每一页中有99 个项目。我想我的路线有问题，但需要一点帮助。

路线：

//First returns single product
Route::get('/products/{cat}/{permalink}', 'ShopController@show')->name('shop.product');
//Second gets all items in category group
Route::get('/products/{cat}', 'ShopController@subIndex')->name('shop.cat');
//Third to pass variable prodNum to ShopController for paginate($prodNum)
Route::get('/products/{cat}?numProducts={prodNum}', 'ShopController@subIndexMore')

ShopController.php

控制器如下所示：

// Shows all items in category, set to 10 items per page via paginate(10)
public function subIndex($cat) {
  $category = Category::where('permalink', $cat)->first();
  $products = ProductGroup::where('category', $category->id)->orderBy('id', 'asc')->paginate(10);
  return view('pages.category',compact('products', 'category'));
}
// Shows all items in category, paginate($prodNum) determines how many items in each page
public function subIndexMore($cat, $prodNum) {
  $category = Category::where('permalink', $cat)->first();
  $products = ProductGroup::where('category', $category->id)->orderBy('id', 'asc')->paginate($prodNum);
  return view('pages.category',compact('products', 'category'));
}

Answer 1

您不需要在路由文件中指定查询字符串参数。您可以访问它们作为您的请求的输入。

public function subIndex(Request $request, $cat)
{
  $num_items = $request->input('numProducts');
  $category = Category::where('permalink', $cat)->first();
  $products = ProductGroup::where('category', $category->id)->orderBy('id', 'asc')->paginate($num_items);
  return view('pages.category',compact('products', 'category'));
}

记得包括：

use Illuminate\Http\Request;

Answer 2

例如http://example.com/first-category?numProducts=99，在这种情况下numProducts是控制器中使用的查询字符串参数$request：

public function subIndex(Request $request, $cat) 
{
  $request->has('numProducts') ? $perPage = $request->get('numProducts') : 10;

  $category = Category::where('permalink', $cat)->first();
  $products = ProductGroup::where('category', $category->id)->orderBy('id', 'asc')->paginate($perPage);
  return view('pages.category',compact('products', 'category'));
}

如果你想在url中使用numProducts作为参数，设置路由如下：

Route::get('/products/{cat}/{perPage}', 'ShopController@subIndexMore');

控制者：

public function subIndexMore($cat, $perPage) {
  $category = Category::where('permalink', $cat)->first();
  $products = ProductGroup::where('category', $category->id)->orderBy('id', 'asc')->paginate($perPage);
  return view('pages.category',compact('products', 'category'));
}

网址将是：

http://example.com/first-category/99