php Laravel 如何在 Eloquent 模型中添加自定义函数？
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Laravel how to add a custom function in an Eloquent model?
提问by Harrison
I have a Product model
我有一个产品型号
class Product extends Model
{
...
public function prices()
{
return $this->hasMany('App\Price');
}
...
}
I want to add a function which will return the lowest price, and in controller I can get the value using:
我想添加一个返回最低价格的函数，在控制器中我可以使用以下方法获取值：
Product::find(1)->lowest;
I added this in Product model:
我在产品模型中添加了这个：
public function lowest()
{
return $this->prices->min('price');
}
but I got an error saying:
但我收到一条错误消息：
Relationship method must return an object of type Illuminate\Database\Eloquent\Relations\Relation
And if I use Product::find(1)->lowest();, it will work. Is it possible to get Product::find(1)->lowest;to work?
如果我使用Product::find(1)->lowest();，它将起作用。可以Product::find(1)->lowest;上班吗？
Any help would be appreciated.
任何帮助，将不胜感激。
回答by Rahul M
When you try to access a function in the model as a variable, laravel assumes you're trying to retrieve a related model. They call them dynamic properties. What you need instead is a custom attribute.
当您尝试将模型中的函数作为变量访问时，laravel 假定您正在尝试检索相关模型。他们称它们为动态属性。您需要的是自定义属性。
Laravel 6 docs: https://laravel.com/docs/6.x/eloquent-mutators
Laravel 6 文档：https://laravel.com/docs/6.x/eloquent-mutators
add following method to your model:
将以下方法添加到您的模型中：
public function getLowestAttribute()
{
//do whatever you want to do
return 'lowest price';
}
Now you should be able to access it like this:
现在您应该可以像这样访问它：
Product::find(1)->lowest;
回答by huuuk
回答by May Weather VN
you can use above methods or use following method to add a function direct into existing model:
您可以使用上述方法或使用以下方法将函数直接添加到现有模型中：
class Company extends Model
{
protected $table = 'companies';
// get detail by id
static function detail($id)
{
return self::find($id)->toArray();
}
// get list by condition
static function list($name = '')
{
if ( !empty($name) ) return self::where('name', 'LIKE', $name)->get()->toArray();
else return self::all()->toArray();
}
}
Or use Illuminate\Support\Facades\DB; inside your function. Hope this help others.
或者使用 Illuminate\Support\Facades\DB; 在你的函数中。希望这对其他人有帮助。
回答by Achraf Khouadja
why you just dont do this? i know , it's not what you asked for specificallyand it migh be a bad practice sometimes. but in your case i guess it's good.
你为什么不这样做？我知道，这不是你特别要求的，有时这可能是一种不好的做法。但就你而言，我想这很好。
$product = Product::with(['prices' => function ($query) {
$query->min('price');
}])->find($id);
