Relations Post Types

This plugin allow to build relation between 2 custom types (posts, page, custom), very useful for manage related content on CMS type website.

A few example use cases:

• manually lists of related posts
• post series
• rented houses connected to agency
• etc.

Relationships are created from a settings page from the administration console.

This plugin can not do relationships with users, you should test this excellent plugin made by scribu
https://wordpress.org/extend/plugins/posts-to-posts/

1. Download, unzip and upload to your WordPress plugins directory
2. Activate the plugin within you WordPress Administration Backend
3. Go to Settings > Relations and enable relation between post type.

Display relations in its theme

Example, display 5 related pages in your single.php template :

<?php
$related_pages_ids = rpt_get_object_relation($id_post, 'page');
if ( count($related_pages_ids) >= 1 ) {
    $related_pages = query_posts( array(
        'post_type' => 'page',
        'post_status' => 'publish',
        'posts_per_page' => 5
        'post__in' => $related_pages_ids,
        'orderby' => 'post_date',
        'order' => 'DESC',
    ) );

    echo 'Related pages' . "\n";
    echo '<ul>' . "\n";
    foreach ( $related_pages as $post ) {
        echo '<li><a href="'.get_permalink($post).'">'.get_the_title($post).'</a></li>' . "\n";
    }
    echo '</ul>' . "\n";
}
?>

1. 

   Metabox in Post Types for creating a relation

2. 

   Option page to set relations between two content types

• Version 1.3.1 :
  • Change settings for quantity, allow to set quantity for each post type
  • Add DIE for direct access
  • Add UNINSTALL method, remove only option. (not yet DB)
  • Move translation to INIT hook
• Version 1.3 :
  • Compatibility with WP 3.5
  • Refactory code: use static methods, use views, new conding standards
  • Add setting for set quantity items
  • Improve performance for rpt_get_objects_most_used()
• Version 1.2.4 :
  • Compatibility with WP 3.4
• Version 1.2.3 :
  • No released version
• Version 1.2.2 :
  • Fix a potential error with PHP Opcode Cache
  • Remove most recent tab, performance bad
• Version 1.2.1 :
  • Add query var with prefix “rel-” for each CPT allow filtering on URL
• Version 1.2 :
  • Stable enough for remove beta version
  • Add some template functions for an easier usage
  • Fix a very rare bug when a post type have relation with the same post type and when this relation is empty, that delete others relations of this post id. (thanks to bniess for reporting bug)
• Version 1.1-beta2 :
  • Fix possible bug with others plugin’s beapi that use import
• Version 1.1-beta1 :
  • Add tab for searching
  • Add tab to select most used elements
  • Add function to get the most associated elements from a post_type
  • Add import/export config tool
• Version 1.0.13 :
  • Fix a warning on admin write page
• Version 1.0.12 :
  • Fix a bug with CSS not existing. (bug copy/paste)
  • Add a argument for get single relation
• Version 1.0.11 :
  • Fix name plugin
  • Possible fix for widget, add reset and use “post__in” instead “include”
• Version 1.0.10 :
  • Fix bug with data lost and quick edit
• Version 1.0.9 :
  • Fix possible bug with folder name
  • Fix bug with functions API and switch_to_blog()
• Version 1.0.8 :
  • Fix potential warning during saving.
  • Fix bug that not allow to uncheck all relations
• Version 1.0.7 :
  • Fix several bugS during saving relations, get relations.
• Version 1.0.6 :
  • Check compatibility with WP 3.0.1
  • Fix constant construction. (try dynamic method)
• Version 1.0.5 :
  • Fix renaming class
• Version 1.0.4 :
  • Fix generation of metabox on admin. Fix for correspond to description and remove stupid return…
• Version 1.0.3 :
  • Fix notices
  • Allow relations between objects of the same post type
• Version 1.0.2 :
  • Optimize some PHP codes
  • Add POT language + French
• Version 1.0.1 :
  • Finalize widget !
  • Add nonce for improve security
• Version 1.0.0 :
  • First version stable