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Contributors: scribu, ciobi
Tags: connections, custom post types, relationships, many-to-many, users
Requires at least: 3.9
Tested up to: 4.3
Stable tag: 1.6.5
License: GPLv2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html

Efficient many-to-many connections between posts, pages, custom post types, users.

Description

This plugin allows you to create many-to-many relationships between posts of any type: post, page, custom etc. A few example use cases:

manually curated lists of related posts
post series
products connected to retailers
etc.

Additionally, you can create many-to-many relationships between posts and users. So, you could also implement:

favorite posts of users
multiple authors per post
etc.

Support & Maintenance

I, scribu, will not be offering support (either free or paid) for this plugin anymore.

Furthermore, I will not be doing any development work whatsoever.

If you want to fix a bug in the plugin or add new features, feel free to fork it on github. I will not be accepting any pull requests though, since ensuring that a code change doesn't break things takes effort, effort which I'm no longer willing to expend.

Links: Documentation | Plugin News | Author's Site

Installation

See Installing Plugins.

After activating it, refer to the Basic usage tutorial.

Additional info can be found on the wiki.

Frequently Asked Questions

The waiting icon keeps spinning forever.

Check for JavaScript errors. If it's an AJAX request, check its output.

Screenshots

Basic connection metabox
Advanced connection metabox
Admin column
Widget
Connection Types screen

Changelog

1.6.5

fixed error when Mustache is already loaded. props ApatheticG
fixed WP_User_Query warning. props PatelUtkarsh
added Chinese translation. props iwillhappy1314

1.6.4

added Danish translation. props phh
updated Swedish translation. props EyesX
fixed issue with multiple parse_query calls. props hezachenary
added p2p_post_admin_column_link and p2p_user_admin_column_link filters. props PareshRadadiya

1.6.3

added Serbian translation. props Borisa Djuraskovic
fixed spinner in admin box. props yamablam
fixed JavaScript error related to Backbone. props ericandrewlewis
made 'p2p_connected_title' filter work for users too. props MZAWeb
added support for 'dropdown_title' labels. props GaryJones
made get_related() consider all connected items

1.6.2

fixed URL query handling. props ntns
store WP_Error instance instead of calling trigger_error(). props MZAWeb
fixed warning when used with Multilingual Press. props dimadin
introduced p2p_connected_title filter. props petitphp

1.6.1

fixed user column handling. props versusbassz
fixed PHP strict standards warnings. props meloniq
added Estonian translation. props RistoNiinemets
added Finnish translation. props danielck

1.6

introduced p2p_candidate_title filter
introduced JavaScript API
added Japanese translation
various refactorings

1.5.2

fixed get_prev() and get_next()
introduced get_adjacent_items()
fixed admin column titles
made admin column titles show up before the post date. props luk3thomas
added 'help' key to 'from_labels' and 'to_labels' arrays. props tareq1988

1.5.1

fix fatal error on activation. props benmay

1.5

added admin dropdowns
fixed SQL error related to user connections
fixed 'labels' handling and added 'column_title' subkey
refactor metabox JavaScript using Backbone.js
lazy-load connection candidates, for faster page loads
lazy-load PHP classes using spl_register_autoload()

1.4.3

various bug fixes
added 'inline' mode for shortcodes
replaced 'trash' icon with 'minus' icon
pass direction to 'default_cb'

1.4.2

fixed each_connected() returning wrapped objects
fixed issue with user queries and get_current_screen()
fixed "Delete all connections" button
fixed bugs with reciprocal and non-reciprocal indeterminate connection types
added Dutch translation

1.4.1

fixed errors in admin box
fixed each_connected()

1.4

added 'p2p_init' hook
replaced 'View All' button with '+ Create connections' toggle
improved usability of connection candidate UI
fixed issues related to auto-drafts
show columns on the admin user list screen
more info

1.3.1

sanitize connection fields values on save, preventing security exploits
improved connection field default value handling
added 'default_cb' as an optional key when defining connection fields
fixed parameter order for 'p2p_admin_box_show' filter
pass the current post ID to the 'p2p_new_post_args' filter

1.3

allow passing entire objects to get_connected(), connect() etc.
made get_related() work with posts-to-users connections
made each_connected() work with simple array of posts
introduced [p2p_connected] and [p2p_related] shortcodes
allow 'default' parameter in 'fields' array
more info

1.2

added Tools -> Connection Types admin screen
fixed migration script
made p2p_get_connections() accept arrays of ids
added 'separator' parameter to p2p_list_posts()
made P2P_Directed_Type->connect() return WP_Error instances instead of just false
when a user is deleted, delete all the associated connections
fixed conflict with bbPress Topics for Posts plugin
more info

1.1.6

convert "View All" tab into button
refresh candidate list after deleting a connection
fix cardinality check
introduce 'p2p_connection_type_args' filter
make 'connected_type' accept an array of connection type names
inadvertently remove support for queries without 'connected_type' parameter

1.1.5

added P2P_Connection_Type->replace() method
added 'self_connections' flag to p2p_register_connection_type()
made P2P_Connection_Type->each_connected() work for posts-to-users connections
made admin list table columns work for posts-to-users connections
fixed 'from_labels' and 'to_labels' parameters
fixed search being limited only to post titles

1.1.4

show attachment thumbnail instead of title
merged 'from_object' into 'from' and 'to_object' into 'to'
made posts-to-users queries respect 'to_query_vars' args
added $prop_name parameter to P2P_Type::each_connected()
fixed connection field name conflict

1.1.3

fixed regression related to posts-to-users direction
fixed admin columns overwriting each other
fixed incorrect direction in admin column links
added notices when connection type is not properly defined

1.1.2

fixed fields not being saved for posts-to-users connections
fixed missing "New Post" tab in admin box
fixed notice when deleting post

1.1.1

fixed faulty scbFramework loading
simplified syntax for defining posts-to-users connection types

1.1

add p2p_type column to the wp_p2p table
new low-level api: p2p_create_connection(), p2p_get_connections(), p2p_delete_connections(), p2p_connection_exists()
support posts-to-users and users-to-posts connection types in the admin
add 'from_labels' and 'to_labels' args to p2p_register_connection_type()
more info

1.0.1

don't show metabox at all if user doesn't have the required capability
fix checkbox handling when there are no other input fields
improve metabox styling
rename 'show_ui' to 'admin_box'
add 'admin_column' parameter

1.0

widget can now list related posts
add P2P_Connection_Type::get_related() method
add 'can_create_post' arg to p2p_register_connection_type()
two-box mode for 'reciprocal' => false
more options for 'show_ui'
allow checkboxes, radio buttons and textareas as connection fields
allow drag & drop ordering in both directions
added get_previous(), get_next() and get_adjacent() methods to P2P_Connection_Type
more info

0.9.5

add '{from|to}_query_vars' args to p2p_register_connection_type()
add 'cardinality' arg to p2p_register_connection_type()
add 'id' arg and p2p_type() function
introduce p2p_split_posts()
remove p2p_connect(), p2p_disconnect() and p2p_get_connected()
more info

0.9.2

fix incorrect storage when creating a connection from the other end
respect 'reciprocal' => false when 'from' == 'to'
pass pagination numbers through number_format_i18n()

0.9.1

fix bug with each_connected()
add widget
allow 'from' and 'to' to be arrays again
improve RTL support

0.9

introduce dropdown connection fields
introduce 'sortable' arg to p2p_register_connection_type()
introduce 'data' arg to p2p_register_connection_type()
replace 'box' arg with hooks
replace p2p_each_connected() with P2P_Post_Type->each_connected()
allow using 'connected_meta' and 'connected_orderby' together
fix some translations
more info

0.8

added ability to create draft posts from the connection box. props Oren Kolker
show post status in the connection box. props Michael Fields
reduced number of queries by caching connection information
revamped p2p_each_connected()
introduced p2p_list_posts()
introduced 'connected_orderby', 'connected_order' and 'connected_order_num' query vars
more info

0.7

improved UI. props Alex Ciobica
added 'fields', 'context' and 'prevent_duplicates' args to p2p_register_connection_type()
more info

0.6

added p2p_each_connected()
fixed p2p_is_connected()
made p2p_get_connected() return p2p_ids even with $direction = 'any'
made compatible with Proper Network Activation
more info

0.5.1

fixed fatal error on Menus screen

0.5

added 'connected_meta' var to WP_Query
attach p2p_id to each post found via WP_Query
'connected_to' => 'any' etc.
$data parameter can also be a meta_query
metabox bugfixes
fixed l10n loading
more info

0.4

introduced 'connected_from', 'connected_to', 'connected' vars to WP_Query
replaced $reciprocal with $data as the third argument
p2p_register_connection_type() accepts an associative array as arguments
removed p2p_list_connected()
added p2p_delete_connection()
more info

paulcanning/wp-posts-to-posts