Doesn't work inside BelongsToMany field

[jamespavett]

Trying to use the Items field within a BelongtoMany field, and the inputted values aren't being passed in the request.

BelongsToMany::make('Individual Site Queries', 'sites', SiteResource::class)->fields(function () {
                return [
                    Text::make('Version', 'version')->sortable()->readonly(),
                    Text::make('Query File', 'query_file')->hideWhenCreating()->readonly()->sortable(),
                    Boolean::make('Template Syntax', 'template_syntax')->sortable()->help('Does this query support Array injection via PHP variables?'),
                    Items::make('Headers', 'headers')->draggable(),
                    Code::make('SQL Query')->resolveUsing(function () {
                        return isset($this->pivot) && $this->pivot->query_file ? Storage::get($this->pivot->query_file) : null;
                    })->rules('required')->language('sql')->temporary(),

                ];
            }),

Have tried referencing column via sites.headers and leaving second parameter blank, but always get the same output. No error on frontend however field in database doesn't update. Works outside of BelongsToMany field though just fine.

[jamespavett]

My bad, released I wasn't including the property as part of my withPivot method options. I can now retrieve stores values in the database, but still can't save values.

public function sites()
    {
        return $this->belongsToMany(Site::class)->using(DatabaseQuerySite::class)->withTimestamps()->withPivot([
            'version', 'query_file', 'template_syntax', 'headers'
        ]);
    }

Edit:

In the end I managed to get the values stored in the database by adding the following code inside by saving observer:

$databaseQuerySite->headers = json_decode($this->request->get('headers'));

This isn't needed outside of a BelongsToMany field though, would be good if it could be added a base functionality.