WP Term Meta

Metadata, for taxonomy terms.

WP Term Meta allows developers to store key/value pairs of data along with a category, tag, or any custom taxonomy.

Installation

• Download and install using the built in WordPress plugin installer.
• Activate in the "Plugins" area of your admin by clicking the "Activate" link.
• No further setup or configuration is necessary.

Usage

add_term_meta()

/**
 * Add metadata field to a term.
 *
 * @since 0.1.0
 * @param  int     $term_id     Post ID
 * @param  string  $meta_key    Metadata name
 * @param  mixed   $meta_value  Metadata value
 * @param  bool    $unique      Optional, default is false. Whether the same key
 *                              can be duplicated
 *
 * @return bool False for failure. True for success.
 */

delete_term_meta()

/**
 * Remove metadata matching criteria from a term.
 *
 * You can match based on the key, or key and value. Removing based on key and
 * value, will keep from removing duplicate metadata with the same key. It also
 * allows removing all metadata matching key if needed.
 *
 * @since 0.1.0
 *
 * @param  int     $term_id    Term ID
 * @param  string  $meta_key   Metadata name
 * @param  mixed   $meta_value Optional. Metadata value
 *
 * @return bool False for failure. True for success.
 */

delete_term_meta_by_key()

/**
 * Delete everything from term meta matching meta key.
 *
 * @since 0.1.0
 *
 * @param string $term_meta_key Key to search for when deleting.
 *
 * @return bool Whether the term meta key was deleted from the database.
 */

get_term_meta()

/**
 * Retrieve term meta field for a term.
 *
 * @since 0.1.0
 *
 * @param  int     $term_id  Term ID
 * @param  string  $key      The meta key to retrieve
 * @param  bool    $single   Whether to return a single value
 *
 * @return mixed Will be an array if $single is false. Will be value of meta
 *               data field if $single is true
 */

update_term_meta()

/**
 * Update term meta field based on term ID.
 *
 * Use the $prev_value parameter to differentiate between meta fields with the
 * same key and term ID.
 *
 * If the meta field for the term does not exist, it will be added.
 *
 * @since 0.1.0
 *
 * @param  int    $term_id     Term ID
 * @param  string $meta_key    Metadata key
 * @param  mixed  $meta_value  Metadata value
 * @param  mixed  $prev_value  Optional. Previous value to check before removing
 *
 * @return bool False on failure, true if success.
 */

get_terms()

Use the meta_query argument according te the WP_Meta_Query specification: http://codex.wordpress.org/Class_Reference/WP_Meta_Query

$terms = get_terms( 'category', array(
        'depth'      => 1,
        'number'     => 100,
        'parent'     => 0,
        'orderby'    => 'order', // Try the "wp-term-order" plugin!
        'order'      => 'ASC',
        'hide_empty' => false,

        // Looky looky!
        'meta_query' => array( array(
                'key' => 'term_thumbnail'
        ) )
) );

FAQ

Does this create new database tables?

Yes. It creates a new wp_termmeta database table for each site it's activated on.

Does this modify existing database tables?

No. All of WordPress's core database tables remain untouched.

Does this support querying by metadata?

Yes. It uses the WP_Meta_Query class to create the necessary MySQL. You can interface with it by passing a meta_query argument into get_terms(), by filtering get_terms_args or however else you choose.

Where can I get support?

The WordPress support forums: https://wordpress.org/support/plugin/wp-term-meta/

Can I contribute?

Yes, please! The number of users needing taxonomy term metadata is growing fast. Having an easy-to-use API and powerful set of functions is critical to managing complex WordPress installations. If this is your thing, please help us out!