How to chunk results from a custom query in Laravel

Question

I have a custom query that grabs data from the old system and maps it to models in the new system. The query looks like this:

$companies = DB::connection('legacy')->select("...");

And since it's a lot of data, I'd like to use Eloquent's chunk feature (just sample code copied from their docs):

User::chunk(200, function($users)
{
    foreach ($users as $user)
    {
        //
    }
});

How do I implement this?

Answer 1

Hello @kartik,

Try something like this:

<?php

$max = 100;
$total = DB::connection('legacy')->select("...")->count();
$pages = ceil($total / $max);
for ($i = 1; $i < ($pages + 1); $i++) {
    $offset = (($i - 1)  * $max);
    $start = ($offset == 0 ? 0 : ($offset + 1));
    $legacy = DB::connection('legacy')->select("...")->skip($start)->take($max)->get();
    /* Do stuff. */
}

Hope it helps!!

Thank you!!