Eloquent: Relationships with 3 tables in laravel 5

Question

I have three models namely Header, Details, Item. The Header have id , customer_id , the Details have id , header_id (FOREIGN KEY) , and item_id (FOREIGN KEY) , and the Item have id , name . Now, I want to relate that tables using laravel eloquent relationships. I've been able to do that with:

class Details extends Model
{
    public function item() {
        return $this->belongsTo('App\Item', 'bill_item_id');
    }

    public function header() {
        return $this->belongsTo('App\Header', 'header_id');
    }
}

The problem is in my controller, I want to get the details but details don't have customer_id.

$detail = Details::where('customer_id', $id)->get();
$detail->load('header', 'item');

The customer_id field is in the header model. if I get all the details, it's working fine but I want to get specific customer.

Answer 1

Write your code like this

$details = Details::with('header')->where('customer_id', $id)->get();

OR

$details = Details::with(['header'=>function($query) use ($id){
    $query->where('customer_id', $id);
}])->get()

This will get result depended on your relation.

Answer 2

you can use with for where the field in relation

Details::with([ 'header' => function($query) use ($id) {$query->where('customer_id', $id);}])->get();