如何从 Laravel 的数据透视表中删除行？

Question

I have a films table which contains a many to many relation eg AgeRatings with a pivot table called film_age_rating which contains a film_id as a foreign key I have this with 3 other relations too.

Right now my app has no functionality to make a deletion request to remove a film, so right now I hard delete rows in the films DB table. When I delete a film from the films table it deletes items, but the data within the pivot table remains unchanged which I don't want to happen.

films_table

public function up()
{
    Schema::create('films', function (Blueprint $table) {
    $table->uuid('id')->primary();
    $table->string('name')->nullable();
}

film_age_rating

public function up()
    {
        Schema::create('film_age_ratings', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->integer('age_rating_id');
            $table->uuid('film_id');
            $table->timestamps();
        });
}

Film Model

public function ageRatings(): BelongsToMany
{
    return $this->belongsToMany(
        AgeRatings::class,
        'film_age_rating',
        'film_id',
        'age_rating_id'
    );
}

Age Rating Model

public function film(): BelongsToMany
{
    return $this->belongsToMany(
        Film::class,
        'film_age_rating',
        'age_rating_id',
        'film_id'
    );
}

I know an option is to add an onDelete cascade to the pivot tables, but that will require lots of migration tables. Is there another way to tackle this without adding a DELETE request for now or is adding the cascade the only option?

Could you please advise me on the most efficient option?

Answer 1

The only way I can imagine is to use softDeletes

On this way, there will be only one query to delete a film, and it will be a logical delete.

Answer 2

You can delete data using the sync() method. It releases the relation from the pivot table. I assuming that you want to delete a film . So this is a sample method in your controller.

public function deleteFilm($id)
{
     $film = Film::find($id);
     $film->ageRatings()->sync([]);
     $film->delete();
}