Why is this ResourceCollection not working?

Route::get('/orders/bulkindex/', function () {
   return OrderResource(Order::all());
});

The error message "Call to undefined method Illuminate\Http\Resources\Json\JsonResource::collection()" suggests that you are trying to use the `::collection()` method on the `OrderResource` class, which is incorrect. In Laravel, you should not call the `::collection()` method on resource classes. Instead, pass an Eloquent model collection directly to the constructor of the resource. Here's a corrected version of your code:

Route::get('/orders/bulkindex/', function () {
   return new OrderResource(Order::all());
});

In this code, we create a new instance of the `OrderResource` class, passing the `Order::all()` collection to its constructor. This will create a JSON response with the data from the `Order` collection, using the structure defined in the `OrderResource` class. Here's an example from the Laravel documentation:

use App\Http\Resources\UserCollection;
use App\User;

Route::get('/users', function () {
    return new UserCollection(User::all());
});

In this example, the `UserCollection` resource collection is used to return a JSON response with the data from the `User` collection. Remember, the `::collection()` method should only be used when creating a resource collection from an array or another collection that is not an Eloquent model collection.