chunkById in descending order

[tuimz]

Hi,

Just checking if there would be interest in this.

I have a specific use case for this and want to check if this is something that would be merged before I start writing code / tests and make a PR.

[gabrielpeixoto]

You can use lazyByIdDesc as follows:

Model::lazyByIdDesc(5000)->each(function ($item) {
    // use $item
});

This will loop through using the following queries:

select * from `model` order by `id` desc limit 5000
select * from `model` where `id` < 20000 order by `id` desc limit 5000;
select * from `model` where `id` < 15000 order by `id` desc limit 5000;
...