Manually handling many-to-many relationships

Hi, I have a many to many relationship between my Major and my Course models. in my Course resource I used to have

Select::make('majors')
   ->relationship('majors', 'name')
   ->multiple()
   ->required()

Select::make('majors')
   ->relationship('majors', 'name')
   ->multiple()
   ->required()

I wanted to filter the list of majors available in this select based on the value of another column, I came up with this solution

Forms\Components\Select::make('type')
    ->options(InstitutionType::class)
    ->live()
    ->afterStateUpdated(fn (FilamentSet $set) => $set('majors', null) )
    ->required(),
Select::make('majors')
    ->options(fn (Get $get) => Major::where('type', '=', $get('type'))->get()->pluck('name', 'id'))
    ->multiple()
    ->required(),

Forms\Components\Select::make('type')
    ->options(InstitutionType::class)
    ->live()
    ->afterStateUpdated(fn (FilamentSet $set) => $set('majors', null) )
    ->required(),
Select::make('majors')
    ->options(fn (Get $get) => Major::where('type', '=', $get('type'))->get()->pluck('name', 'id'))
    ->multiple()
    ->required(),

but without the relationship method the form cannot be submitted properly, because filament no longer knows how to handle my majors and institutions relationship

2 Replies

CGM•6mo ago

Is this related? https://filamentphp.com/docs/3.x/forms/adding-a-form-to-a-livewire-component#passing-the-form-model-after-the-form-has-been-submitted Not sure if that's what you're looking for, but I just ran across it in the doc's earlier.

use App\Models\Post;
 
public function create(): void
{
    $post = Post::create($this->form->getState());
    
    // Save the relationships from the form to the post after it is created.
    $this->form->model($post)->saveRelationships();
}

use App\Models\Post;
 
public function create(): void
{
    $post = Post::create($this->form->getState());
    
    // Save the relationships from the form to the post after it is created.
    $this->form->model($post)->saveRelationships();
}

Adding a form to a Livewire component - Form Builder - Filament

King DiceOP•6mo ago

I don't think it is, I don't think filament can figure out how to handle my relationship if simply run ->saveRelationship() Bumping this up

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Manually handling many-to-many relationships