Laravel 范围是否适用于每个模型实例？

Question

I am using Laravel 5.7 and PHP 7.2.10.

I want those records, for which either max_age = 0 or if max_age > 0, then it should check if given $age is in between max_age and min_age .

In CarPremium model

public function scopeAge($query, $age)
 {
     if ( $this->max_age == 0 ) {
        return $query;
     } else {
       return $query->where('min_age', '<=', $age)->where('max_age', '>=', $age)->orWhere('max_age','=',0);
    }
}

I am getting the records for which age not between max_age and min_age and not getting records for which max_age = 0 .

In tinker

>>> App\Models\CarPremium::query()->age(18)->get()
=> Illuminate\Database\Eloquent\Collection {#3064
     all: [
       App\Models\CarPremium {#3063
         id: 2,
         min_age: 25,
         max_age: 100,
         status: 1,
         created_at: "2018-12-10 05:34:39",
         updated_at: "2018-12-10 05:34:39",
       },
       App\Models\CarPremium {#3064
         id: 8,
         min_age: 18,
         max_age: 30,
         status: 1,
         created_at: "2018-12-10 05:34:39",
         updated_at: "2019-01-15 09:14:53",
       },
     ],
   }

Answer 1

You can update scope with :

public function scopeAge($query, $age)
{

    return $query->where('max_age','=',0)
        ->orWhere(function($q) use($age){
            return $q->where('min_age', '<=', $age)->where('max_age', '>=', $age);
        });

}

Then you can do :

App\\Models\\CarPremium::age(18)->get()

Answer 2

You cannot use model properties ( $this->max_age ) in a scoped function. The query has not yet been executed so it's impossible to compare to a local value.

A better way would be to add an or where to your query:

public function scopeAge($query, $age)
{
    return $query
            ->where('max_age', 0)
            ->orWhere(function ($query) use ($age) {
                $query  
                    ->where('min_age', '<=', $age)
                    ->where('max_age', '>=', $age);
            });
}