attach one post from one post type to another post from another post type

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I have 2 custom post types: agenda and doel.
At each agenda post, I want to choose a doel post to attach it to, and the same with normal posts.
So I want a connection between posts, agenda, en doel.

I found this plugin called posts2posts from scribu, it does attach the posts types to each other, but I can not find out how and if it is possible to connect certain posts from one post type to certain posts from an other post type.

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The ideal solution would be to have a dropdown in one post type, that shows all the posts from an other one, and you can select one.
In example, when editing a post from agenda, I can choose a post from doel to attach it to.

And later on I want to loop that.

Does someone know how this can be done easily, or recommend a good plugin?

Sorry for my bad explanation, hope it is kind of clear.

Post Views: 2

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1 comment

  1. Plugin Recommendations are considered off-topic here. One solution could be to add a metabox to your post like so:

    Add to Functions.php

    /** Add Post Metabox **/
function add_custom_meta_box() {
    add_meta_box(
        'pick_post', // $id
        'Pick Post', // $title 
        'show_custom_meta_box_pick_post', // $callback
        'agenda', // $page
        'side', // $context
        'high'); // $priority
}
add_action('add_meta_boxes', 'add_custom_meta_box');

/** Post Metabox Callback (show some stuff in box) **/
function show_custom_meta_box_pick_post() {
    $doelArr = get_posts( array( 'post_type' => 'doel', 'orderby' => 'title', 'order' => 'ASC', 'posts_per_page' => -1 ) );
    $meta_doel = get_post_meta($post->ID, '_doellist', true);
?>
    <input type="hidden" name="info_meta_box_nonce" value="<?php echo wp_create_nonce(basename(__FILE__)); ?>" />
    <strong>Associated Doel</strong>
        <br />
    <select id="selectdoel" name="_doellist">
        <option value="">Select Doel</option>
    <?php foreach($doelArr as $doel) : setup_postdata( $doel ) ?>
        <?php if($doel->ID == $meta_doel) : ?>
            <option value="<?php echo $doel->ID; ?>" selected="selected"><?php echo $doel->post_title; ?></option>
        <?php else : ?>
            <option value="<?php echo $doel->ID; ?>"><?php echo $doel->post_title; ?></option>
        <?php endif; ?>
    <?php endforeach; ?>
    </select>
}

/** Save Our Meta-data **/
function save_custom_meta($post_id) {
    global $post;

    // check autosave
    if ((defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) || (!current_user_can('edit_post', $post_id)))
        return $post_id;

    if($post->post_type == 'agenda')
    {
        // Doel Selection List Check
        if(isset($_POST['_doellist']) && $_POST['_doellist'] != '')
            update_post_meta($post_id, '_doellist', strip_tags($_POST['_doellist']));
        else
            delete_post_meta($post_id, '_doellist');
    }
}

    What this does is create a small metabox with a dropdown of Doel posts – then saved the Doel Post ID as a meta value. You can get that meta-value (Doel Post ID) at any time by passing in the Agenda ID to get_post_meta() function.

    $meta_doel = get_post_meta($post->ID, '_doellist', true);

    Then you could get the entire Doel post like so:

    $doel_post = get_post($meta_doel);

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