Laravel eloquent: Multiply two columns of two different tables - laravel

Question

My Order Model
class Order extends Model
{
protected $fillable = [
'id','user_id', 'erp_id', 'currency_code','ex_rate_with_base','order_status','status','created_at'
];
protected $hidden = ['updated_at',];
public function orderList(){
return $this->hasMany(OrderList::class);
}
public function currency(){
return $this->belongsTo(Currency::class,'currency_code');
}
}
My Currency Model
class Currency extends Model
{
protected $fillable = [
'currency_code','currency_name', 'currency_symbol', 'ex_rate_with_base', 'update_via', 'status',
];
protected $hidden = [
'created_at','updated_at','updated_by','created_by',
];
protected $primaryKey = 'currency_code';
public $incrementing = false;
public function order()
{
return $this->hasMany(Order::class,'currency_code');
}
}
My OrderList Model
class OrderList extends Model
{
protected $fillable = [
'id','order_id', 'product_code', 'qty','unit_price','status',
];
protected $hidden = [
'created_at' ,'updated_at',
];
public function order(){
return $this->belongsTo(Order::class);
}
}
In my Order controller I want to run the query:
$order_history_list = Order::where([['user_id', $user->id], ['updated_at','>', $updated_at]])
->with([
'currency' => function ($query) {
$query->select('currency_code','currency_symbol','ex_rate_with_base');
},
'orderList' => function ($query) {
$query->select('id','order_id', 'product_code', '***order_lists.qty * orders.ex_rate_with_base AS unit_price_with_ex_rate***','status');
}
])->get();
But error is occuring due to the highlighted portion.
Error: Unknown column 'order_lists.qty * orders.ex_rate_with_base' in 'field list'
Please help me with the correct syntax
How can I use column of order table in the sub query ?

Answer 1

Use DB::raw in your select statement and add a join to the 'orderList' $query
$order_history_list = Order::where([['user_id', $user->id], ['updated_at','>', $updated_at]])
->with([
'currency' => function ($query) {
$query->select('currency_code','currency_symbol','ex_rate_with_base');
},
'orderList' => function ($query) {
$query->select('id','order_id', 'product_code', DB::raw('order_lists.qty * orders.ex_rate_with_base AS unit_price_with_ex_rate'),'status')
->join('orders','order_lists.order_id', 'orders.id');
}
])->get();

Answer 2

My Final Query That Worked:
$order_history_list = Order::where([['user_id',$user->id],['updated_at','>',$updated_at]])
->with(['currency'=>function($query){
$query->select('currency_code','currency_symbol','ex_rate_with_base');
},'orderList' => function($query){
$query->select('order_lists.id','order_lists.order_id', 'order_lists.product_code', 'order_lists.qty','order_lists.unit_price',DB::raw('he_order_lists.qty* he_orders.ex_rate_with_base AS unit_price_with_ex_rate'),'order_lists.status')->join('orders','order_lists.order_id', 'orders.id');
}])->get();