这是关系
hasMany
推车belongsTo
产品->
price这是Model类
//# TransactionModel
public function getCarts(){
return $this->hasMany(CartModel::class, 'transaction_id','id');
}
//# CartModel
public function getProduct(){
return $this->belongsTo(ProductModel::class,'product_id','id');
}
我想要实现的是获得当前交易的总价(很多)
我现在所做的仍然是每次交易迭代,并在qazxsw poi中总结价格
$total
如何以雄辩的代码谢谢
我认为这应该工作:
Class TransactionModel{
public static function getTotalPrice($transactions){
$total = 0;
foreach($transactions as $transaction){
$total += $transaction->getCarts->sum('getProduct.price');
}
return $total;
}
我终于找到了一个更好的方法,收集减少而不是foreach
Class TransactionModel{
public function getTotalPrice(){
return $this->getCarts()->withCount([
'getProduct' => function($q){
return $q->select(DB::raw("SUM(price) as price_sum"));
}
])->get()->sum('getProduct_count');
}
}