BelongsToMany: Multi-Select and Relation Managers

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Now, let's see how we can add data to a many-to-many relationship. Let's say that our Product may have many Tags.

We generate the Model+Migration:

php artisan make:model Tag -m

Here's the structure, with relationship right away:

Migration

Schema::create('tags', function (Blueprint $table) {
    $table->id();
    $table->string('name');
    $table->timestamps();
});

app/Models/Tag.php:

use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 
class Tag extends Model
{
    protected $fillable = ['name'];
 
    public function products(): BelongsToMany
    {
        return $this->belongsToMany(Product::class);
    }
}

Also, the relationship from the other way:

app/Models/Product.php:

use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 
class Product extends Model
{
    // ...
 
    public function tags(): BelongsToMany
    {
        return $this->belongsToMany(Tag::class);
    }
}

Next, we generate this simple Filament Resource:

php artisan make:filament-resource Tag --simple --generate

The result is this:

But, of course, the Tags CRUD is not the topic of this lesson. What we need to do is add tags to products. Multiple tags.

There are a few ways to do it.

Option 1. Just Attach: Select Multiple

Let's add one more field in the form of...