Question

我想使用父模型中的数据在子模型中运行saving()函数

以前，我将计算的数据插入到模型“贷款”中的表中，但是现在我需要将其插入到子模型“ InterestAmount”中

Loan.php

use Illuminate\Database\Eloquent\Model;
class Loan extends Model
{

    protected $fillable ['amount','interest','status','duration','member_id','loan_type_id','interest_type_id','loan_payment_type_id'];

    //protected $appends = 'interest_amount

    protected static function boot()
    {
        parent::boot();
        static::saving(function($model) {
            $model->interest_amount = ($model->amount/100 )* $model->interest;
        });
    }

    public function interest_amount()
    {
        return $this->hasMany(InterestAmount::class,'loan_id','id');
    }

}

我想从Loan.php中删除保存功能，并按以下方式使用。

Interest.php

use Illuminate\Database\Eloquent\Model;
class InterestAmount extends Model
{
    public function loan()
    {
        $this->belongsTo(Loan::class,'loan_id','id');
    }

    protected static function boot()
    {
        parent::boot();
        static::saving(function($model) {
            $model->interest_amount = ($model->amount/100 )* $model->interest;
        }); 
    }
}

如何在此函数中获取“金额”和“利息”？

Answer 1

$model模型中的InterestAmount变量引用一个InterestAmount对象：

static::saving(function($model){
    $model->interest_amount = ($model->loan->amount/100 )* $model->loan->interest;
});

然后，您需要使用关系方法loan获取相关的loan()，然后获取属性amount/interest。

注意：：正如@namelivia的评论所说，您在return方法中缺少了loan()：

public function loan()
{
    return $this->belongsTo(Loan::class,'loan_id','id');
}

将父模型的数据提取到static :: saving（）引导函数中

1 个答案: