Introduction to Laravel’s whereIn() method in the query builder

When you’re diving into Laravel’s query builder, one of the handy tools in your arsenal is the whereIn() method.

It’s a straightforward yet powerful way to filter your database queries.

Think of it like a tool helping you pick exactly what you need from a list of items in your database.

How whereIn() works

Imagine you have a list of user IDs, and you need to fetch users that match these IDs from your database.

That’s where Laravel’s query builder whereIn() method comes into play.

It allows you to specify a column, like user_id, and a set of values. The framework then fetches rows where the column’s value is in the provided set.

Using whereIn() in your code

Here’s a quick example:

$users = User::whereIn('id', [1, 2, 3])->get();

In this snippet, the whereIn() method is fetching users whose id is either 1, 2, or 3.

Without whereIn(), you whould have to do something like this:

$users = User::where('id', 1)
	->orWhere('id', 2)
	->orWhere('id', 3)
	->get();

When not to use whereIn()

While whereIn() is handy, it’s important to use it wisely.

If you have a massive array of items you’re filtering by, this can slow down your query. So, always try to limit the size of the array you pass to whereIn().

Instead, I would try to find the common denominator between all those items and use that to run my queries faster.