einundzwanzig-portal/app/Nova/LibraryItem.php

<?php

namespace App\Nova;

use Ebess\AdvancedNovaMediaLibrary\Fields\Files;
use Ebess\AdvancedNovaMediaLibrary\Fields\Images;
use Illuminate\Http\Request;
use Laravel\Nova\Fields\BelongsTo;
use Laravel\Nova\Fields\BelongsToMany;
use Laravel\Nova\Fields\Boolean;
use Laravel\Nova\Fields\Code;
use Laravel\Nova\Fields\ID;
use Laravel\Nova\Fields\Select;
use Laravel\Nova\Fields\Text;
use Spatie\TagsField\Tags;

class LibraryItem extends Resource
{
    /**
     * The model the resource corresponds to.
     * @var string
     */
    public static $model = \App\Models\LibraryItem::class;

    /**
     * The single value that should be used to represent the resource when being displayed.
     * @var string
     */
    public static $title = 'name';

    /**
     * The columns that should be searched.
     * @var array
     */
    public static $search = [
        'id',
        'name',
    ];

    /**
     * Get the fields displayed by the resource.
     *
     * @param  \Illuminate\Http\Request  $request
     *
     * @return array
     */
    public function fields(Request $request)
    {
        return [
            ID::make()
              ->sortable(),

            Images::make('Main picture', 'main')
                  ->conversionOnIndexView('thumb'),

            Images::make('Images', 'images')
                  ->conversionOnIndexView('thumb')
                  ->help('Lade hier Bilder hoch, um sie eventuell später in der Markdown Description einzufügen. Du musst vorher aber Speichern.'),

            Files::make('Downloadable File', 'single_file')
                 ->help('Für neue Datei-Typen bitte bei den Admins melden. (Derzeit: PDF)'),

            Select::make('Language Code', 'language_code')
                  ->options(
                      config('languages.languages')
                  )
                  ->rules('required', 'string'),

            Tags::make('Tags')
                ->type('library_item')
                ->withLinkToTagResource(Tag::class),

            Text::make('Name')
                ->rules('required', 'string'),

            Select::make('Type')
                  ->options(
                      [
                          'book'              => 'book',
                          'blog_article'      => 'blog_article',
                          'markdown_article'  => 'markdown_article',
                          'youtube_video'     => 'youtube_video',
                          'vimeo_video'       => 'vimeo_video',
                          'downloadable_file' => 'downloadable_file',
                      ]
                  )
                  ->rules('required', 'string'),

            Code::make('Value')
                ->rules('required', 'string')
                ->help('Hier bitte die URL zum Video einfügen, oder den Link zum Blog-Artikel, oder den Link zum Buch, oder das Markdown selbst einfügen.'),

            BelongsTo::make('Lecturer'),

            BelongsToMany::make('Library', 'libraries', Library::class),

        ];
    }

    /**
     * Get the cards available for the request.
     *
     * @param  \Illuminate\Http\Request  $request
     *
     * @return array
     */
    public function cards(Request $request)
    {
        return [];
    }

    /**
     * Get the filters available for the resource.
     *
     * @param  \Illuminate\Http\Request  $request
     *
     * @return array
     */
    public function filters(Request $request)
    {
        return [];
    }

    /**
     * Get the lenses available for the resource.
     *
     * @param  \Illuminate\Http\Request  $request
     *
     * @return array
     */
    public function lenses(Request $request)
    {
        return [];
    }

    /**
     * Get the actions available for the resource.
     *
     * @param  \Illuminate\Http\Request  $request
     *
     * @return array
     */
    public function actions(Request $request)
    {
        return [];
    }
}