How to use link table with Eloquent?

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I have two models: Country and Grade wrote them as:

Country.php:

class Country extends Eloquent {
    protected $fillable = [];

    public function grades()
    {
        return $this->hasMany('Grade', 'title');
    }
}

Grade.php:

class Grade extends Eloquent {
    protected $fillable = [];

    public function country()
    {

        return $this->belongsTo('Country');
    }
}

when I try to get all grades for specific country:

return Response::json(Country::find($country_id)->grades());

But this would result into empty object {}

I am using many to many link table:

Schema::create('countries_grades', function(Blueprint $table)
        {
            $table->increments('id');
            $table->integer('country_id');
            $table->integer('grade_id');
            $table->timestamps();
        });

It seems that laravel is not using the above table, what is the correct way to achieve this query?

asked 18 secs ago

Amjad Emerah

3

How to use link table with Eloquent?