Posts and Post Types

To leverage the power of Conifer, extend the Conifer\Post\Post class rather than the more generic Timber\Post. Since Conifer\Post\Post in turn extends Timber\Post, you get all the benefits of Timber's class, with some added functionality for querying posts of specific types, along with other goodies.

Conifer comes with a few built-in post classes that extend Conifer\Post\Post. These are:

  • BlogPost for representing WP posts of type post

  • FrontPage for representing the homepage of the site

  • Page for representing WP posts of type page

Getting started with Custom Post Types

There are couple things you need to do to get up and running with CPTs in Conifer:

Define the POST_TYPE class constant

This tells Conifer what type of post you're defining, even for static methods (such as create()).

use Conifer\Post\Post;

class Robot extends Post {
  const POST_TYPE = 'robot';

  // ...

Failing to define this constant may result in a RuntimeException being thrown later. The message should tell you exactly what you need to do.

Registering your Custom Post Type

Just like in vanilla WP, you need to register your CPT using register_post_type.

To make this easier, Conifer offers a higher-level Post::register_type() method.

$site = new Conifer\Site();
$site->configure(function() {
    add_action('init', [Robot::class, 'register_type']);

Calling Robot::register_type() with no arguments will result in labels like Add New Robot and View All Robots.

How? Conifer uses the POST_TYPE class constant along with any passed $options to produce a comprehensive set of labels to pass to register_post_type(). By default, plural labels are just singular labels with an "s" appended, to capture most cases in English. But you can also specify a plural_label inside your $options array to override this, and any plural labels will be interpolated accordingly.

If your POST_TYPE class constant is in snake_case (which is the recommended style), Post::register_type() will convert it to Space Separated Capitalized Words. For example, a POST_TYPE definition of special_post translates into singular and plural labels Special Post and Special Posts, respectively.

Overriding post type label settings

Custom pluralization and other fine-tuning is also easy: simply implement the static type_options() method:

/* lib/MyProject/Person.php */
namespace MyProject;

class Person extends Post {
  const POST_TYPE = 'person';

  public static function type_options() : array {
      return [
      'plural_label' => 'People',
      'labels'       => [
        'add_new_item'     => 'Onboard New Person'
        'singular_name'    => 'Person',
        'insert_into_item' => 'Insert into bio',
      'description'  => 'A real-life person',

Then just call your custom post type's register_type() method normally in your site config callback:

  /* functions.php config callback */

This is equivalent to the following:

register_post_type('person', [
  'labels'      => [
    'name'                  => 'People',
    'singular_name'         => 'Person',
    'add_new_item'          => 'Onboard New Person',
    'edit_item'             => 'Edit Person',
    'new_item'              => 'New Person',
    'view_item'             => 'View Person',
    'view_items'            => 'View People',
    'search_items'          => 'Search People',
    'not_found'             => 'No People found',
    'not_found_in_trash'    => 'No People found in trash',
    'all_items'             => 'All People',
    'archives'              => 'Person Archives',
    'attributes'            => 'Person Attributes',
    'insert_into_item'      => 'Insert into bio',
    'uploaded_to_this_item' => 'Uploaded to this Person',
  'description' => 'A real-life person',

Registering custom taxonomies

The Post::register_taxonomy() method offers a similarly high-level way to declare custom taxonomies on your custom post types. In this case, it takes the name of the taxonomy and any valid options, plus a special plural_label option:


Similar to the register_type() method, this will appropriately infer singular and plural labels to be passed to the core register_taxonomy() function. The $object_type argument is simply inferred from the post type.

The above snippet is equivalent to:

register_taxonomy('sign', 'person', [
  'labels' => [
    'name'                       => 'Signs', // inferred from taxonomy name
    'singular_name'              => 'Sign',  // inferred from taxonomy name
    'menu_name'                  => 'Signs',
    'all_items'                  => 'All Signs',
    'edit_item'                  => 'Edit Sign',
    'view_item'                  => 'View Sign',
    'update_item'                => 'Update Sign',
    'add_new_item'               => 'Add New Sign',
    'new_item_name'              => 'New Sign Name',
    'parent_item'                => 'Parent Sign',
    'parent_item_colon'          => 'Parent Sign:',
    'search_items'               => 'Search Signs',
    'popular_items'              => 'Popular Signs',
    'separate_items_with_commas' => 'Separate Signs with commas',
    'add_or_remove_items'        => 'Add or remove Signs',
    'choose_from_most_used'      => 'Choose from the most used Signs',
    'not_found'                  => 'No Signs found',
    'back_to_items'              => '← Back to Signs',

Just as with defining post type options within your type_options() method, you can specify arbitrary options:

Person::register_taxonomy('sign', [
  'description' => 'This person\'s astrological sign',

Info: Don't pass post type!

Note that you don't pass in a post type argument, as that's inferred from your class's POST_TYPE constant.

This is equivalent to:

register_taxonomy('sign', 'person', [
  'description' => 'This person\'s astrological sign',    
  'labels' => [
    'name'                       => 'Signs', // inferred from taxonomy name
    'singular_name'              => 'Sign',  // inferred from taxonomy name
    // ... all the same labels as above ...

Registering taxonomies across post types

To declare custom taxonomies shared across post types, you must pass null as the $object_type argument to the core function. Since Conifer's method version infers this from the post type, you can instead pass an optional third parameter to the method, to tell it to omit the post type in the taxonomy declaration:

Person::register_taxonomy('sign', [/* ... */], true);

Per the Codex, if you do this you'll need to explicitly include this taxonomy in the type_options() method for each of your post types you want included in this taxonomy:

null - Setting explicitly to null registers the taxonomy but doesn't associate it with any objects, so it won't be directly available within the Admin UI. You will need to manually register it using the 'taxonomy' parameter (passed through $args) when registering a custom post_type (see register_post_type()), or using register_taxonomy_for_object_type().

Checking for the existence of a post ID

You can check whether a post exists with a given ID and an appropriate post_type using the Post::exists() method. It uses late static binding on the POST_TYPE class constant to check the post_type of any posts it finds. That is, the exists() method will only return true when the post_type matches up with the POST_TYPE constant.

For example, let's say we have a page in the database:

$pageId = wp_insert_post(['post_type' => 'page']);
\Conifer\Post\Page::exists($pageId); // -> true
\Conifer\Post\BlogPost::exists($pageId); // -> false

Of course, it'll also return false if we call it with an ID that does not exist at all, regardless of post_type:

$badId = 9001;
get_post($badId); // -> null
\Conifer\Post\BlogPost::exists($badId); // -> false
\Conifer\Post\Page::exists($badId); // -> false
\Conifer\Post\Post::exists($badId); // -> false

Checking for any type of post

You can call exists() on the abstract Post class to skip the post_type check and look for a post of any post_type:

$pageId = wp_insert_post(['post_type' => 'page']);
$postId = wp_insert_post(['post_type' => 'post']);

\Conifer\Post\Post::exists($pageId); // -> true
\Conifer\Post\Post::exists($postId); // -> true

$badId = 9001;
get_post($badId); // -> null
\Conifer\Post\Post::exists($badId); // -> false

Checking for custom posts

This works for custom posts, too, as long as your custom post class defines its own POST_TYPE contant:

echo Robot::POST_TYPE; // -> outputs "robot"
$robot = Robot::create(['post_title' => 'Some robot or other']);
Robot::exists($robot->id); // -> true

$postId = wp_insert_post(['post_type' => 'post']);
Robot::exists($postId); // -> false

Saving New Posts

Using our Robot class from above as an example, let's see how easy it is to create posts, even ones that implement a CPT, using Post::create():

$wall_e = Robot::create([
  'post_title' => 'WALL-E',
  'post_content' => 'Waaaaallll eeeeee! Eeeeevaaaaa!',
  'disposition' => 'friendly',
  'directive' => 'save the planet',


Note that we can mix in the custom disposition and directive fields with our arguments. Conifer filters the data intelligently, discerning which keys correspond to proper wp_posts columns, and which should become meta fields.

Querying for custom post types

Conifer Post classes know how to instantiate themselves in query results. The static get_all() method will return an array of whichever subclass of Post was called, whether that's BlogPost, Page, or a CPT:

$robots = Robot::get_all(['numberposts' => 3]);
// -> array of Robot instances

Contrast this to the Timber::get_posts() method, which we'd have to tell to return Robots:

$robots = Timber::get_posts(['numberposts' => 3], Robot::class);

Thanks to Conifer's use of late static binding, we can omit this argument to get_all().

Conifer provides the awesome Post::get_related_by_taxonomy() method, which lets you query a specific post for posts of the same type that share its taxonomy terms. Helpers are provided for WordPress's built-in category and tag taxonomies, but you can use this method with any taxonomy, including custom ones.

Say we want to compare Robots on the basis of where they fall within the uncanny valley, or in other words how much they freak us out. Let's first declare an eeriness_level taxonomy to use as a coarse-grained metric:

use Conifer\Post\Post;

class Robot extends Post {
  const POST_TYPE = 'robot';

  public static function register() {
    register_post_type('robot', ['label' => 'Robots']);
    register_taxonomy('eeriness_level', 'robot');
// make sure to call `Robot::register()` in an `init` action callback!

You can set up several eeriness_level terms through the WP Admin UI, just as you would for any other taxonomy term. For example, say you set up the terms Cute, Kinda Eerie, and Eerie af. Furthermore, let's create a couple Robot posts called "WALL-E" and "EVE" in the database, and assign them each an eeriness level of Cute.

Now, you can query a Robot instance for others posts of type robot with the same eeriness_level:

// single-robot.php
$robot = new Robot();
$similarlyEerieRobots = $robot->get_related_by_taxonomy('eeriness_level');

EVE will show up in WALL-E's related list, and vice versa, because they're both Cute.

Built-in taxonomies

WordPress's built-in category and post_tag taxonomies get their own helpers in Conifer, which you can use on blog posts. (You can of course extend those taxonomies to organize pages or any other post type, but that's beyond the scope of Conifer's docs.)

// single.php
$post = new BlogPost();
$relatedPosts = $post->get_related_posts_by_category();
$relatedPostsByTag = $post->get_related_posts_by_tag();

Customizing Post Admin Columns

Conifer lets you easily add custom admin columns to your WP Admin post listing screen:

use Conifer\Post\Post;

class Robot extends Post {
  const POST_TYPE = 'robot';

  public static function register() {
    register_post_type('robot', ['label' => 'Robots']);
    static::add_admin_column('disposition', 'Disposition');

This adds a new Disposition column to the listing screen for Robot posts that displays each Robot's disposition from its meta data.

Specifying the column value

If you want to display something more involved than a simple meta_value, you can specify a callback parameter to the add_admin_column method. Let's say you have some meta column called beeps but you don't care about the actual values - you just want to know how many beeps each Robot has:

    static::add_admin_column('beep_count', 'Beep Count', function($id) {
      // count the beeps for this Robot.
      $robot = new static($id);
      $beeps = $robot->meta('beeps') ?: [];
      return count($beeps) ? 'None';

This code tells Conifer to grab the beeps for each Robot, count them, and display the count (or "None" if the count is zero, or if no beeps value exists for any given Robot).

Customizing Post Admin Filters

As with columns, Conifer lets you easily add custom filters to your WP Admin post listing screen. Say we want to extend the WP Admin to be able to filter Robots by the custom taxonomy eeriness_level:

use Conifer\Post\Post;

class Robot extends Post {
  const POST_TYPE = 'robot';

  public static function register() {
    register_post_type('robot', ['label' => 'Robots']);
    register_taxonomy('eeriness_level', 'robot', [
      'labels' => ['name' => 'Eeriness Levels', 'singular_name' => 'Eeriness Level'],


Conifer recognizes that eeriness_level is a taxonomy and queries its terms automatically, displaying them as options (along with an "Any Eeriness Level" option at the top, of course) in a new admin filter dropdown.

Defining advanced filters

If you want to filter by some aspect of your posts that isn't a taxonomy, you can specify your own options and a callback for modifying the WP_Query instance in some way. Say you have a beeps meta field that has zero or more rows in the database:

// ensure post ID=4 has zero beeps
delete_post_meta(4, 'beeps');
// add some beeps for post ID=3
add_post_meta(3, 'beeps', 'BEEP');
add_post_meta(3, 'beeps', 'BEEP!');
add_post_meta(3, 'beeps', 'BEEEEP!');

You can define an admin filter that queries by the presence of absence of beeps in the meta table, just by specifying how you want to modify the query when you look for it:

    $options = [
      ''    => 'Beeps or not',
      'yes' => 'With beeps',
      'no'  => 'Without beeps',

    static::add_admin_filter('has_beeps', $options, function(
      WP_Query $query,
      string $beepsFilterValue
    ) {
      if ($beepsFilterValue === '') {
        // don't filter

      $comparison = $beepsFilterValue === 'yes' ? 'EXISTS' : 'NOT EXISTS';

      $query->query_vars['meta_query'] = [
          'key' => 'beeps',
          'compare' => $comparison,

This displays a dropdown with the options Beeps or not, With beeps, and Without beeps. The callback passed as the third parameter runs when WordPress fires the pre_get_posts filter, and takes the current WP_Query object and the user-specified filter value as arguments. You can, of course, put any code you want in here, modifying $query in whatever way you choose.

Custom columns/filters for existing post types

The static register method is just a Conifer convention for a place to put stuff about your post types. You don't need to define it any more than you need to define custom post types in the first place!

The custom admin column/filter functionality is defined in the Conifer\Post\HasCustomAdminColumns and Conifer\Post\HasCustomAdminFilters traits, respectively. Both traits are included in the Conifer\Post\Post base class. This means you can define custom columns and filters for existing post types, for example using Conifer's Page class:

use Conifer\Post\Page;

register_taxonomy('specialty', 'page', [
  'labels' => ['name' => 'Specialties', 'singular_name' => 'Specialty'],

Page::add_admin_column('specialties', 'Specialties', function($id) {
  $page = new Page($id);
  return implode(', ', $page->get_terms('specialty'));

Note that the get_terms() instance method returns Timber\Term objects, which implement their own __toString() method. That is, we don't even have to loop through the result of get_terms() to get each term's name because Timber does that for us. Thanks, Timber!

Grouping by Term

The Conifer\Post\HasTerms trait, included in Conifer\Post\Post, defines the get_all_grouped_by_term() helper, for getting Timber\Term instances and their respective posts. Say we have our Robot class from previous examples, plus the eeriness_level taxonomy declared for the robot custom post type, and we want to list the different eeriness levels and their corresponding robots:

// page-robots-by-eeriness-level.php

// set up Timber context with the current page
$data = $site->get_context_with_post(new Page());

$data['robots_by_eeriness_level'] = Robot::get_all_grouped_by_term('eeriness_level');

Timber::render('robots-by-eeriness-level.twig', $data);

This will query all non-empty eeriness_level terms and grab all the posts of type robot inside them, so that we can do something like this in our Twig template:

{# robots-by-eeriness-level.twig #}

<div class="eeriness-levels">
  {% for level in robots_by_eeriness_level %}
      <h3>{{ level.term }}</h3>
        {% for robot in level.posts %}
            <a href="{{ }}">{{ robot.title }}</a>
        {% endfor %}
  {% endfor %}

The term object inside each level in the returned array is an instance of Timber\Term.

Overriding the list of terms

Say we only want to know about the Robots at the extremes: those at the cute and eerie-af levels. By default, Conifer will query all non-empty terms in the taxonomy. But we can specify a second argument as a list of terms:

$data['robots_by_eeriness_level'] = Robot::get_all_grouped_by_term(
  ['cute', 'eerie-af']

This will filter the Terms queried to just those with the specified slugs. Alternatively, each item in the array can be a term_id, an instance of Timber\Term (or any subclass thereof), or a native WP_Term object.

We can even mix and match types:

$terms = [
  new Timber\Term('eerie-af'),
  get_term(123), // WP_Term object
  456 // hard-code term_id

$data['robots_by_eeriness_level'] = Robot::get_all_grouped_by_term(

Filtering the posts in each group

Say you're curating the premiere website for Robot enthusiasts, and you need to review user submissions. You have so many submissions, you need to conquer and divide: you're the expert on cute robots, and your intrepid co-founder covers eerie ones. You can group robots just fine, but how do you filter down to just those that pending review?

You can specify a third argument, an array that specifies additional query parameters for the post query:

$data['robots_by_eeriness_level'] = Robot::get_all_grouped_by_term(
  ['cute', 'eerie-af'],
  ['post_status' => 'pending']

Each time posts for a given term are queried, Conifer will merge the pending status constraint into the query. This third argument can be any valid arguments to WP_Query , with the exception of post_type, which is locked down.

Advanced Search Features

Conifer exposes a very powerful API for customizing how post searches works, allowing you to expose meta fields in search with fine-grained control over post types, statuses, and more. See Search for more details.

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