Comment créer une relation entre deux types de publication personnalisés?

Utilisation d'unplugin

Quelquestrèsbonspluginspour les relations:

• Champ de relation ACF
• Posts-2-Posts

Utilisation d'une Metabox

Vouspouvez créer une relation simpleen utilisant desmétaboxes:

 add_action( 'admin_init', 'add_meta_boxes' );
function add_meta_boxes() {
    add_meta_box( 'some_metabox', 'Movies Relationship', 'movies_field', 'series' );
}

function movies_field() {
    global $post;
    $selected_movies = get_post_meta( $post->ID, '_movies', true );
    $all_movies = get_posts( array(
        'post_type' => 'movies',
        'numberposts' => -1,
        'orderby' => 'post_title',
        'order' => 'ASC'
    ) );
    ?>
    <input type="hidden" name="movies_nonce" value="<?php echo wp_create_nonce( basename( __FILE__ ) ); ?>" />
    <table class="form-table">
    <tr valign="top"><th scope="row">
    <label for="movies">Movies</label></th>
    <td><select multiple name="movies">
    <?php foreach ( $all_movies as $movie ) : ?>
        <option value="<?php echo $movie->ID; ?>"<?php echo (in_array( $movie->ID, $selected_movies )) ? ' selected="selected"' : ''; ?>><?php echo $movie->post_title; ?></option>
    <?php endforeach; ?>
    </select></td></tr>
    </table>
}

add_action( 'save_post', 'save_movie_field' );
function save_movie_field( $post_id ) {

    // only run this for series
    if ( 'series' != get_post_type( $post_id ) )
        return $post_id;        

    // verify nonce
    if ( empty( $_POST['movies_nonce'] ) || !wp_verify_nonce( $_POST['movies_nonce'], basename( __FILE__ ) ) )
        return $post_id;

    // check autosave
    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
        return $post_id;

    // check permissions
    if ( !current_user_can( 'edit_post', $post_id ) )
        return $post_id;

    // save
    update_post_meta( $post_id, '_movies', array_map( 'intval', $_POST['movies'] ) );

}
 

Etpuis,pour obtenir la relation avec lesfilms sousforme de listepour lespublications de séries:

 $series = new WP_Query( array(
    'post_type' => 'movies',
    'post__in' => get_post_meta( $series_id, '_movies', true ),
    'nopaging' => true
) );

if ( $series-> have_posts() ) { while ( $series->have_posts() ) {
    $series->the_post();
    ?>
    <li><a href="<?php the_permalink(); ?>"><?php the_title(); ></a></li>
    <?php
} }
 

Using a Plugin

Some very good plugins for relationships:

• ACF Relationship Field
• Posts-2-Posts

Using a Metabox

You can build a simple relationship using metaboxes:

add_action( 'admin_init', 'add_meta_boxes' );
function add_meta_boxes() {
    add_meta_box( 'some_metabox', 'Movies Relationship', 'movies_field', 'series' );
}

function movies_field() {
    global $post;
    $selected_movies = get_post_meta( $post->ID, '_movies', true );
    $all_movies = get_posts( array(
        'post_type' => 'movies',
        'numberposts' => -1,
        'orderby' => 'post_title',
        'order' => 'ASC'
    ) );
    ?>
    <input type="hidden" name="movies_nonce" value="<?php echo wp_create_nonce( basename( __FILE__ ) ); ?>" />
    <table class="form-table">
    <tr valign="top"><th scope="row">
    <label for="movies">Movies</label></th>
    <td><select multiple name="movies">
    <?php foreach ( $all_movies as $movie ) : ?>
        <option value="<?php echo $movie->ID; ?>"<?php echo (in_array( $movie->ID, $selected_movies )) ? ' selected="selected"' : ''; ?>><?php echo $movie->post_title; ?></option>
    <?php endforeach; ?>
    </select></td></tr>
    </table>
}

add_action( 'save_post', 'save_movie_field' );
function save_movie_field( $post_id ) {

    // only run this for series
    if ( 'series' != get_post_type( $post_id ) )
        return $post_id;        

    // verify nonce
    if ( empty( $_POST['movies_nonce'] ) || !wp_verify_nonce( $_POST['movies_nonce'], basename( __FILE__ ) ) )
        return $post_id;

    // check autosave
    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
        return $post_id;

    // check permissions
    if ( !current_user_can( 'edit_post', $post_id ) )
        return $post_id;

    // save
    update_post_meta( $post_id, '_movies', array_map( 'intval', $_POST['movies'] ) );

}

And then, to get the movies relationship as a list for series posts:

$series = new WP_Query( array(
    'post_type' => 'movies',
    'post__in' => get_post_meta( $series_id, '_movies', true ),
    'nopaging' => true
) );

if ( $series-> have_posts() ) { while ( $series->have_posts() ) {
    $series->the_post();
    ?>
    <li><a href="<?php the_permalink(); ?>"><?php the_title(); ></a></li>
    <?php
} }

Je recommande leplugin Posts 2 Posts ,queje viens de commencer à utiliser.

Il vouspermet de créer des relationsplusieurs-à-plusieursentre les articleset lestypes depage,ce qui signifie que vouspouvez lier des movies à des series,et àtout autre CPT que vouspourriez créer.

Ceplugin vouspermet également de créer des métadonnées de connexion qui vouspermettrontpour obtenir des détailsplusfins lors de la création de vos connexions.Ilest assezflexible dans son utilisation,permettant de contrôler lesmétaboxes d'administration,lestypes de connexionet lesmoyens d'afficher vos connexions sur lefront-end.Enfin,ilest bien documenté .

I recommend the Posts 2 Posts plugin, which I've just started using.

It allows you to create many-to-many relationships between posts and page types, meaning you can link movies to series, and any other CPTs you may create.

This plugin also allows you to create connection metadata which will allow you to get finer detail when creating your connections. It is quite flexible in its usage, allowing for control over admin metaboxes, connection types, and ways to display your connections on the front end. Lastly, it is well-documented.

Malheureusement,leplugin Posts 2 Postsest obsolèteet n'estplusmaintenu.Ilexiste unnouveauplugin alternatifpour ces MB Relationships .Ilestinspiré du P2Pet fournit une API similairepour créer des relationsentre les articles,lestermeset les utilisateurs.

MB Relationshipsprenden charge les relationsbidirectionnellespar défautet utilise unetablepersonnaliséepour stocker les relations (comme le P2P)pour unemeilleureperformance (que lapublication deméta).

Cela vaut lapeine dejeter un œil auplugin.

Unfortunately, the Posts 2 Posts plugin is deprecated and no longer maintained. There is a new alternative plugin for that MB Relationships. It's inspired by P2P and provides a similar API to create relationships between posts, terms and users.

MB Relationships supports bi-directional relationships by default and use a custom table to store relationships (like P2P) for a better performance (than post meta).

It's worth taking a look at the plugin.