Filament•3mo ago

Select with Relationship always Null

Hi, I always get a null response when submitting a form using select that is related to another model and has multiple types. Even though I have cast the model to an array and have also created a controller for it. Is this a bug or is there an error in my code?

11 Replies

kisut•3mo ago

Can anyone help me please😞

awcodes•3mo ago

Not entirely sure what you are trying to do, but relationships shouldn’t be cast as arrays.

kisut•3mo ago

I’m making a regular form, but there is select (multiple) field with relationships. If select has multiple value, then its gonna store as an array on db right?

awcodes•3mo ago

Nope if it’s a multiple item relationship. Then the id’s are not actually stored on the model, their parent id is stored on the relationships model. Unless it is a many to many relationship, in which case it needs a pivot table. I would recommend spending some time looking at the relationship documentation on the laravel docs to get a more solid understanding. Either way, there shouldn’t be a cast for any relationship in the app.

kisut•3mo ago

So the null response is generated because I used cast?

awcodes•3mo ago

There’s no way to know for sure. But based on what you’ve shared you are not using relationships appropriately. At least, that’s my opinion.

Lara Zeus•3mo ago

not sure if this related but there is a note about the foreign key column: https://filamentphp.com/docs/3.x/forms/advanced#saving-data-to-a-belongsto-relationship

kisut•3mo ago

Looks like it's done because I forgot to make the parent column nullable, thank you guys Just realized that the filled column is the column in the pivot table, and the main table column contains null. Is that how it works or is there an error?

Dennis Koch•3mo ago

The ->relationship() always saves directly to the DB that's why the record is null for a moment If it's a belongsToMany data is always stored on the pivot

kisut•3mo ago

I see, thanks Dennis. So how to display artist name based on artist_id to the table column? I'm kinda confused about this relationship things

public function primaryArtists()
    {
        return $this->belongsToMany(Artist::class, 'primary_artist_track', 'track_id', 'artist_id');
    }

public function primaryArtists()
    {
        return $this->belongsToMany(Artist::class, 'primary_artist_track', 'track_id', 'artist_id');
    }

My relationship looks like this

Tables\Columns\TextColumn::make('primaryArtists.artist_id')

Tables\Columns\TextColumn::make('primaryArtists.artist_id')

Trying this but the data does not appear

Dennis Koch•3mo ago

You probably want primaryArtists.name or similar then.

Gaming

Programming

Select with Relationship always Null