如何从Laravel的控制器中获取查询结果ID？

Question

I want to take houses lists and houses pictures on mysql from laravel. But, i have this problem. Using the process below:

$houses = Houses::query()
             ->orderBy('sort', 'ASC')
             ->take('6')
             ->get();

This query, give houses list to me. And I need to use the houses I retrieve to get their photos, this is the best I could think of:

$pictures = Housephotos::query()
            ->where('house_id', '=', $houses->house_id)
            ->get();

Question one: This process is correct?
Question two : How can do this?

Answer 1

You need to make a relationship between Housephotos and House so that there is house_id in Housephotos. If this is true, you can already use the houses Id you have to retrieve the houses Id:

Say you already have the houses, then you can have:

$pictures = Housephotos::whereIn('house_id', '=', $houses->pluck('id')->toArray())
        ->get();

This will give you the houses photos.

Answer 2

Add a relation to Houses:

class Houses extends Model 
{
    public function photos()
    {
        return $this->hasMany(Housephotos::class);
    }
}

and now you can get the photos easily like:

$houses = Houses::query()
             ->orderBy('sort', 'ASC')
             ->take('6')
             ->get();

foreach ($houses->photos as $photo) {
    echo $photo->id;
}

the problem with that is, select query will run n times (5 times for this example).

if you add with to the query however, then laravel will run a single in query to get the pictures:

$houses = Houses::query()
             ->with('pictures')
             ->orderBy('sort', 'ASC')
             ->take('6')
             ->get();