LARAVEL 调用未定义的方法 Illuminate\\Database\\Eloquent\\Builder::splice()

Question

I am trying to select some atributes of the table Animals and at the same time selecting their photos.

The problem is that in my case I want to select 20 animals depending on the page (For example, if I am in page 2 I want to take the animals between 20-40

I am doing an splice for that, but I don't know how to make it work, it throws me that error.

Anyobody knows why or how?

Many thanks in advance!

$cantidad is the quantity of animals I want to take $pagina is the page

Answer 1

You need to be aware of the class you're working with, especially Builder vs Collection

All queries in Laravel ( Animal::select(...) ) are instances of the Builder class until a closure ( ->get() , ->first() , etc) is called. Since you're not using one of those closures before calling ->splice() , you're attempting to call this method on a class ( Builder ) that doesn't have it. The Collection class has this method:

https://laravel.com/docs/7.x/collections#method-splice

So you need to use ->get() before ->splice() :

return Animal::select(...)
->join(...)
->where(...)
->get()
->splice(...)
->toJson();