Rewards with multiple winners in WordPress

1 comment

1. There’s no need to create a custom database table to do this.

   • Register a custom post type for Awards including just a few features (title,editor and image).
   • Add a metabox to handle the winners (registered users).
   • Attach a custom taxonomy for something like prizes.
   • With that, you can use the default WP_Query capabilities and create regular theme templates, or widgets, or shortcodes, to output results.

   

   There are good plugins to manage CPTs and Custom Fields that make this easy, but here’s the small plugin outlined above:

   <?php
   /**
    * Plugin Name: (SO) Awards, prizes and winners
    * Plugin URI:  http://stackoverflow.com/q/25936506/1287812
    * Version:     0.1
    * Author:      brasofilo 
    */
   
   class SO_25936506
   {
       private $cpt = 'reward';
   
       public function __construct()
       {
           add_action( 'init', array( $this, 'init' ) );
           add_action( 'save_post', array( $this, 'save' ), 10, 2 );
       }
   
        public function init() {
           $labels = array(
               'name' => _x( 'Rewards', 'post type general name' ),
               'singular_name' => _x( 'Reward', 'post type singular name' ),
               'add_new' => _x( 'Add New', 'reward' ),
               'add_new_item' => __( 'Add New Reward' ),
               'edit_item' => __( 'Edit Reward' ),
               'new_item' => __( 'New Reward' ),
               'all_items' => __( 'All Rewards' ),
               'view_item' => __( 'View Reward' ),
               'search_items' => __( 'Search Rewards' ),
               'not_found' =>  __( 'No rewards found' ),
               'not_found_in_trash' => __( 'No rewards found in Trash' ), 
               'parent_item_colon' => '',
               'menu_name' => __( 'Rewards' )
           );
           $args = array(
               'labels' => $labels,
               'public' => true,
               'publicly_queryable' => true,
               'show_ui' => true, 
               'show_in_menu' => true, 
               'query_var' => true,
               'rewrite' => array( 'slug' => _x( 'reward', 'URL slug' ) ),
               'capability_type' => 'page',
               'has_archive' => true, 
               'hierarchical' => false,
               'menu_position' => null,
               'taxonomies' => array('prize'),
               'supports' => array( 'title', 'editor', 'thumbnail' ),
               'register_meta_box_cb' => array( $this, 'add_metabox' )
           );
           register_post_type( $this->cpt, $args );
   
           register_taxonomy('prize', $this->cpt, array(
               // Hierarchical taxonomy (like categories)
               'hierarchical' => true,
               // This array of options controls the labels displayed in the WordPress Admin UI
               'labels' => array(
                   'name' => _x( 'Prizes', 'taxonomy general name' ),
                   'singular_name' => _x( 'Prize', 'taxonomy singular name' ),
                   'search_items' =>  __( 'Search Prizes' ),
                   'all_items' => __( 'All Prizes' ),
                   'parent_item' => __( 'Parent Prize' ),
                   'parent_item_colon' => __( 'Parent Prize:' ),
                   'edit_item' => __( 'Edit Prize' ),
                   'update_item' => __( 'Update Prize' ),
                   'add_new_item' => __( 'Add New Prize' ),
                   'new_item_name' => __( 'New Prize Name' ),
                   'menu_name' => __( 'Prizes' ),
               ),
               // Control the slugs used for this taxonomy
               'rewrite' => array(
                   'slug' => 'prizes', // 
                   'with_front' => false, 
                   'hierarchical' => true 
               ),
           ));
       }
   
       public function add_metabox()
       {
           add_meta_box( 
               'winners', 
               'Winners', 
               array( $this, 'do_metabox' ), 
               $this->cpt, 
               'normal', 
               'default', 
               array( // to build the custom fields
                   '_winner_gold' => array( 'title'=>'Gold', 'desc' => 'G desc' ),
                   '_winner_silver' => array( 'title'=>'Silver', 'desc' => 'S desc' ),
                   '_winner_bronze' => array( 'title'=>'Bronze', 'desc' => 'B desc' )
               )
           );
       }
   
       // back function of add meta box that displays the meta box in the post edit screen
       public function do_metabox( $post, $box )
       {
           wp_nonce_field( plugin_basename( __FILE__ ), 'noncename_so_25936506' );
           foreach( $box['args'] as $field => $value )
               $this->print_field( $field, $value, $post->ID );
       }
   
       public function print_field( $field, $value, $post_id )
       {
           $post_meta = get_post_meta( $post_id, $field, true);
           $selected = ($post_meta) ? $post_meta : false;
           $users_dd = wp_dropdown_users(array(
               'name' => 'author', 
               'echo'=>false, 
               'name'=>$field, 
               'show_option_none'=>'Select winners'
           ));
           printf(
               '<label>%s: </label>%s <small>%s</small><br/>',
               $value['title'],
               $users_dd,
               $value['desc']
           );
       }
   
       public function save( $post_id, $post_object ) 
       {
           // Verify auto save 
           if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) 
               return;
   
           // Security
           if ( 
               !isset( $_POST['noncename_so_25936506'] ) 
               || !wp_verify_nonce( $_POST['noncename_so_25936506'], plugin_basename( __FILE__ ) ) 
               )
               return;
   
           if ( $this->cpt !== $post_object->post_type )
               return;
   
           // Process post data
           foreach( array('_winner_gold','_winner_silver','_winner_bronze') as $field )
           {
               if ( isset( $_POST[$field] )  )
                   update_post_meta( $post_id, $field, $_POST[$field] );
               else 
                   delete_post_meta( $post_id, $field );
           }
       }
   }
   new SO_25936506();
   

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