Laravel WhereIn不起作用

Question

Why does this return a collection as expected;

$postcodes = DB::table('payments')->whereIn('VendorZIP', array('BS19AA','PO48AA'))->get();
print_r($postcodes);

But this returns an error;

$payments = Payment::all();
$payments->whereIn('VendorZIP', array('BS19AA','PO48AA'))->get();
print_r($payments);

The error is;

Call to undefined method Illuminate\Database\Eloquent\Collection::whereIn()

Of course I have a Payment model;

<?php namespace App\Models;

  use Illuminate\Database\Eloquent\Model;

  class Payment extends Model {
    //
  }

Answer 1

There's no need to call all() before whereIn() . Change your code to this:

$payments = Payment::whereIn('VendorZIP', array('BS19AA','PO48AA'))->get();

You can find more examples in Eloquent basic usage documentation.