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Package wp-content-connect
Short Description Post to Post and Post to User Library for WordPress
License GPL-3.0-or-later
Informations about the package wp-content-connect
WP Content Connect
WordPress library that enables direct relationships for posts to posts and posts to users.
Installation and Usage
WP Content Connect can be used as a plugin or a standalone library. The easiest way to use this is to install as a plugin and activate.
Composer install
As a library
First, require this repository using the command line:
$ composer require 10up/wp-content-connect
or directly in composer.json
:
This will install WP Content Connect to your vendor
folder and allow you to to use it as a library by calling \TenUp\ContentConnect\Plugin::instance();
from your code.
As a plugin
Alternatively, if you prefer to have composer install it as a plugin, you may redeclare this package in your composer.json
using the following example:
Defining Relationships
Relationships can be defined once any post types they utilize are defined by hooking into the tenup-content-connect-init
action. This action is fired on the WordPress init
action, at priority 100, so any post types must be registered prior to this. Currently supported relationships are post-to-post and post-to-user. Additionally, when registering a relationship, you must specify a name
. Name enables multiple distinct relationships between the same object types. For instance, you could have a post-to-user relationship for post type post
with a type of researchers
to indicate that any user in the "researcher" relationship is a researcher for the post and have another post-to-user relationship defined for post type post
with a name of backer
to indicate that any user in the "backer" relationship contributes financially to the post.
define_post_to_post( $from, $to, $name, $args = array() )
This method defines a post to post relationship between two post types, $from
and $to
.
Parameters:
$from
(String) First post type in the relationship
$to
(String|Array) Second post type(s) in the relationship
$name
(String) Unique name for this relationship, used to distinguish between multiple relationships between the same post types
$args
(Array) Array of options for the relationship
Args:
Args expects options for the from
and to
sides of the relationship as top level keys. Options for each direction are as follows:
enable_ui
(Bool) - Should the default UI be enabled for the current side of this relationshipsortable
(Bool) - Should the relationship be sortable for the current side of this relationshiplabels
(Array) - Labels used in the UI for the relationship. Currently only expects one value,name
(String)
Return Value
This method returns an instance of \TenUp\ContentConnect\Relationships\PostToPost
specific to this relationship. The object can then be used to manage related items manually, if required. See the <@TODO insert link> section below.
Example:
define_post_to_user( $post_type, $name $args = array() )
This method defines a post to user relationship between the supplied post type and users.
Parameters:
$post_type
(String) The post type to be related to users
$name
(String) Unique name for this relationship, used to distinguish between multiple relationships between users and the same post type
$args
(Array) Array of options for the relationship
Args:
Args expects options for the from
(post type) side of the relationship as a top level key. Options are as follows:
enable_ui
(Bool) - Should the default UI be enabled for the current side of this relationshipsortable
(Bool) - Should the relationship be sortable for the current side of this relationshiplabels
(Array) - Labels used in the UI for the relationship. Currently only expects one value,name
(String)
Return Value
This method returns an instance of \TenUp\ContentConnect\Relationships\PostToUser
specific to this relationship. The object can then be used to manage related items manually, if required. See the <@TODO insert link> section below.
Example:
There is not currently support for rendering any default UIs on the User side of these relationships
Sortable Relationships
Relationships can optionally support sortable related items. Order can be stored independently for both sides of a relationship. For example, if you have cars and tires, you may have a car that has 5 related tires, and if you wanted to sort the tires, you do so from the car page. You could then go to one of the related tires, and order all of the cars it is related to separately.
Since you can manage this relationship from both post types in the relationship, if you added a tire from the car page, and you had relationship data previously stored on the tire, the NEW car in the relationship will still show up in query results, at the very end (after all of your other pre-ordered data).
Query Integration
Querying for relationships is enabled via a new relationship_query
parameter for WP_Query
. The format for relationship_query
is very similar to tax_query
.
A valid relationship query segment requires name
and either related_to_post
OR related_to_user
. As many relationship segments as necessary can be combined to create a specific set of results, and can be combined using an AND
or OR
relation.
Top Level Args:
relation
(String) Can be eitherAND
(default) orOR
. How all of the segments in the relationship should be combined.
Segment Args:
name
(String) The unique name for the relationship you are querying. Should match aname
from registering relationships.related_to_post
(Int) Find items in the relationship related to this post ID. Cannot be used in the same segment asrelated_to_user
.related_to_user
(Int) Find items in the relationship related to this user ID. Cannot be used in the same segment asrelated_to_post
.
Example:
Currently, querying for multiple post types in WP_Query may not work as expected. When using relationship queries, make sure to only have one post_type
value in WP_Query.
Order By
For relationships where sorting is disabled, all of the default WP_Query orderby
options are supported.
In addition to default orderby
options, if sorting is enabled for a relationship, an additional orderby parameter relationship
is supported.
When using relationship
as the orderby value, the order is always ASC
and you must adhere to the following WP_Query
and WP_User_Query
restrictions:
- Compound relationship queries are not allowed - only one segment may be added to the query
For example, this is fine:
while this will not work (orderby will be ignored):
Manually Managing Relationships
If you choose to not use the built in UIs for relationships, you'll need to manually update relationships. DO NOT try and work directly with the database tables. Instead, work with the following API methods. The underlying implementations may need to change from time to time, but the following methods should continue to function if the underlying implementations need to change.
These methods are available on the relationship objects returned when defining the relationship. Make sure to call these methods on the specific relationship object you are defining a relationship for, as these methods are specific to the relationship context (they are aware of the name
of the relationship, as well as the post types in the relationship).
If you don't already have a relationship object, you can get one from the registry using either Registry->get_post_to_post_relationship()
or Registry->get_post_to_user_relationship()
.
Registry->get_post_to_post_relationship( $cpt1, $cpt2, $name )
Returns the relationship object between the two post types with the provided name.
Parameters:
$cpt1
(String) The first post type in the relationship
$cpt2
(String) The second post type in the relationship
$name
(String) The name of the relationship, as passed to define_post_to_post_relationship
Example:
Registry->get_post_to_user_relationship( $post_type, $name )
Returns the relationship object between the post types and users with the provided name.
Parameters:
$post_type
(String) The post type in the post to user relationship
$name
(String) The name of the relationship, as passed to define_post_to_user_relationship
Example:
PostToPost->add_relationship( $pid1, $pid2 )
This method adds a relationship between one post and another, in a post to post relationship. When calling this method, the order of IDs passed is not important.
Parameters:
$pid1
(Int) The ID of the first post in the relationship
$pid2
(Int) The ID of the second post in the relationship
Example:
PostToPost->delete_relationship( $pid1, $pid2 )
This methods deletes a relationship between one post and another, in a post to post relationship. When calling this method, the order of IDs passed is not important.
Parameters:
$pid1
(Int) The ID of the first post in the relationship. Does not need to be in the same order as the relationship was added.
$pid2
(Int) The ID of the second post in the relationship. Does not need to be in the same order as the relationship was added.
Example:
PostToPost->replace_relationships( $post_id, $related_ids )
Replaces existing relationships for the post to post relationship. Any relationship that is present in the database but not in $related_ids will no longer be related.
Parameters:
$post_id
(Int) The ID of the post we are replacing relationships from.
$related_ids
(Array) An array of Post IDs of items related to $post_id
Example:
Post ID 5 is related to posts 2, 3, 6, 7, 8
PostToPost->save_sort_data( $object_id, $ordered_ids )
For a relationship with sorting enabled, this saves the order of the posts for a single direction of the relationship.
Parameters:
$object_id
(Int) The Post ID that we are ordering from. If we were ordering 5 tires for a single car, this would be the car ID.
$ordered_ids
(Array) An array of Post IDs, in the order they should be sorted. If we were ordering 5 tires for a single car, this is the ordered tire IDs.
Example:
Car ID 5 has five related tires, that should be ordered 7, 6, 3, 8, 2
PostToUser->add_relationship( $post_id, $user_id )
This method adds a relationship between a post and a user, in a post to user relationship.
Parameters:
$post_id
(Int) The ID of the post in the relationship
$user_id
(Int) The ID of the user in the relationship
Example:
PostToUser->delete_relationship( $post_id, $user_id )
This method deletes a relationship between a post and a user, in a post to user relationship.
Parameters:
$post_id
(Int) The ID of the post in the relationship
$user_id
(Int) The ID of the user in the relationship
Example:
PostToUser->replace_post_to_user_relationships( $post_id, $user_ids )
Replaces users related to a post with the provided set of user ids. Any users related to the post that are not provided in $user_ids will no longer be related.
Parameters:
$post_id
(Int) The ID of the post we are replacing relationships from.
$user_ids
(Array) An array of User IDs related to $post_id
Example:
Post ID 5 is related to users 3, 4, 5
PostToUser->replace_user_to_post_relationships( $user_id, $post_ids )
Replaces posts related to a user with the provided set of post ids. Any posts related to the user that are not provided in $post_ids will no longer be related.
Parameters:
$user_id
(Int) The User ID we are replacing relationships from.
$post_ids
(Array) An array of Post IDs related to $user_id
Example:
User 2 is related to posts 6, 7, 8
PostToUser->save_post_to_user_sort_data( $object_id, $ordered_user_ids )
For a relationship with sorting enabled, this saves the order of users for a particular post
Parameters:
$object_id
(Int) The ID of the post to store the order of users for
$ordered_user_ids
(Array) Array of User IDs, in the order they should be sorted.
Example:
Post ID has 5 users that need to be stored in the following order: 2, 4, 1, 6, 3
PostToUser->save_user_to_post_sort_data( $user_id, $ordered_post_ids )
For a relationship with sorting enabled, this saves the order of posts for a particular user
Parameters:
$user_id
(Int) The ID of the user to store the order of posts for
$ordered_post_ids
(Array) Array of Post IDs, in the order they should be sorted
Example:
User ID 1 has 5 posts that need to be stored in the following order: 4, 2, 7, 9, 8
Support Level
Stable: 10up is not planning to develop any new features for this, but will still respond to bug reports and security concerns. We welcome PRs, but any that include new features should be small and easy to integrate and should not include breaking changes. We otherwise intend to keep this tested up to the most recent version of WordPress.