Plugin.php

<?php namespace PKleindienst\BlogSeries;

use Backend;
use Event;
use System\Classes\PluginBase;
use RainLab\Blog\Controllers\Posts as PostsController;
use RainLab\Blog\Models\Post as PostModel;

/**
 * BlogSeries Plugin Information File
 * @package PKleindienst\BlogSeries
 */
class Plugin extends PluginBase
{
    /**
     * @var array   Require the RainLab.Blog plugin
     */
    public $require = ['RainLab.Blog'];

    /**
     * Returns information about this plugin.
     *
     * @return array
     */
    public function pluginDetails()
    {
        return [
            'name'        => 'BlogSeries',
            'description' => 'Add posts to series',
            'author'      => 'PKleindienst',
            'icon'        => 'icon-list-alt',
            'homepage'    => 'https://github.com/PascalKleindienst/october-blogseries-extension'
        ];
    }

    /**
     * @return array
     */
    public function registerComponents()
    {
        return [
            'PKleindienst\BlogSeries\Components\BlogSeries'     => 'blogSeries',
            'PKleindienst\BlogSeries\Components\BlogSeriesList' => 'blogSeriesList',
            'PKleindienst\BlogSeries\Components\PostNavigation' => 'postNavigation',
            'PKleindienst\BlogSeries\Components\RelatedSeries'  => 'relatedSeries'
        ];
    }

    /**
     * Inject into Blog Posts
     */
    public function boot()
    {
        // Extend the model
        PostModel::extend(function ($model) {
            $model->belongsTo['series'] = [
                'PKleindienst\BlogSeries\Models\Series'
            ];
        });

        // Extend the navigation
        Event::listen('backend.menu.extendItems', function ($manager) {
            $manager->addSideMenuItems('RainLab.Blog', 'blog', [
                'series' => [
                    'label'       => 'Series',
                    'icon'        => 'icon-list-alt',
                    'code'        => 'series',
                    'owner'       => 'RainLab.Blog',
                    'permissions' => ['rainlab.blog.access_posts'],
                    'url'         => Backend::url('pkleindienst/blogseries/series')
                ]
            ]);
        });

        // Extend the controller
        PostsController::extendFormFields(function ($form, $model) {
            if (!$model instanceof PostModel) {
                return;
            }

            $form->addSecondaryTabFields([
                'categories' => [
                    'tab'          => 'rainlab.blog::lang.post.tab_categories',
                    'type'         => 'relation',
                    'commentAbove' => 'rainlab.blog::lang.post.categories_comment',
                    'placeholder'  => 'rainlab.blog::lang.post.categories_placeholder',
                    'span'         => 'left'
                ],
                'series' => [
                    'label'       => 'Series',
                    'tab'         => 'rainlab.blog::lang.post.tab_categories',
                    'type'        => 'relation',
                    'nameFrom'    => 'title',
                    'span'        => 'right',
                    'emptyOption' => '-- None --'
                ]
            ]);
        });
    }
}