Laravel withCount包含空关系

Question

I would like withCount to include the count of non-existent relationships.

For example, let's say I have a table called people , and a table called pets .

people hasmany pets , but pets can have a null people_id . I want to get a count of the the pets per people , but I also want to include pets that does not have a people_id .

I know I can simply do People::withCount('pets')->get() , but this does not include a count of pets with null people_id .

The result I'm looking for would be something like:

person_name | pets_count
John        | 2
Mike        | 3
Joan        | 0
NULL        | 20

I hope this makes sense.

Answer 1

In this case, you can use ROLLUP . Give it a try. It may help you.

People::withCount('pets')->groupBy(\DB::raw('id WITH ROLLUP'))->get();

to know more, please check this

Answer 2

You may do something like this:

People::selectRaw('peoples.*, COUNT(pets.id) AS pets_count')
->rightJoin('pets', 'people.id', '=', 'pets.people_id')
->get()