BelongsTo in Laravel - php

Question

I have a table which is named cars with 2 fields id, matriculation.
Then, I have another table which is named series with 2 fields id, name.
I have created my fk_serie on my table cars.
public function up()
{
Schema::create('cars', function (Blueprint $table) {
$table->increments('id');
$table->string('matriculation', 25);
$table->integer('fk_serie')->unsigned();
$table->foreign('fk_serie')->references('id_serie')->on('serie');
$table->timestamps();
});
}
Here is my information about the table series.
public function up()
{
Schema::create('series', function (Blueprint $table) {
$table->increments('id');
$table->string('name', 30);
$table->timestamps();
});
}
In my model, I only have a function on the model Car.
public function serie(){
return $this->belongsTo('App\Serie', 'fk_serie');
}
I don't have nothing in my model Serie
class Serie extends Model
{
//
}
Is it normal that the model Serie is empty?
Because, my join works.
What do you think ?
Is there an error?

Answer 1

As Dparoli mentioned in comments if you don't need the below query then your above structure of relationship is normal
Serie::with('cars')->find($id)
But if you want to setup relationship in Serie Model you can do something like below:
class Serie extends Model
{
public function cars() {
return $this->hasMany('App\Car', 'fk_serie'); // your relationship
}
}
And after that you can do:
$series = Serie::with('cars')->find($id); //eager loading cars
$cars = $series->first()->cars;