php - Laravel eloquent counting a relation

Question

I'm new to laravel and eloquent and I'm not sure if this is even possible. but I have 2 tables with a one to many relationship. One is "locations" and one is "users". One location can have many users.

So if I wanted to get all locations with all users I would just do this:

Location::with("users")->get();

But I also want to know how many users each location has, I tried doing this

Location::with("users")->count("users")->get();

But that didn't work.

Answer 1

The n+1 issue that was mentioned doesn't occur if you use eager loading.

$locations = Location::with('users')->get();

$locations->users()->count();

This should result in three queries, no matter how many users or locations you have.

• count query against the location model
• select * from locations
• select * from users where in

The confusion arises from the fact that this also works:

$locations = Location::all();

$locations->users()->count();

But in this case, it does query once for each location.

See the docs for more info: http://laravel.com/docs/eloquent#eager-loading