query multiple taxonomies

All we need is an easy explanation of the problem, so here it is.

I have a function set up to show ‘Similar Products’, i.e. showing products that share the same products-category taxonomy term. This works great but I want to narrow the function even further and make it more specific. Thus I want it to look at 2 taxonomies (product-category and space) to find similar products. The current markup as follows:

    <?php  
    $terms = wp_get_post_terms( $post->ID, 'products-category' );
    if($terms){
      // post has course_type terms attached
      $course_terms = array();
      foreach ($terms as $term){
       $course_terms[] = $term->slug;
      }

     $original_query = $wp_query;
     $wp_query = null;
     $wp_query = new WP_Query(
        array(
            'posts_per_page' => '4',
            'post_type' => 'regularproducts',
            'tax_query' => array(
                array(
                    'taxonomy' => 'products-category',
                    'field' => 'slug',
                    'terms' => $course_terms, //the taxonomy terms I'd like to dynamically query
                ),
            ),
            'orderby' => 'title',
            'order' => 'ASC',
        )
    );

    if ( have_posts() ): ?>

    <?php while (have_posts() ) : the_post(); ?> //etc...

So it currently only looks at the products-category taxonomy for similar products (posts), but I want it to look at BOTH product-category and space to display more specific similar products, if possible. Any suggestions would be greatly appreciated!

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

First of all, get all term slugs from the custom taxonomy space by current post ID.

$space_terms = wp_get_post_terms( $post->ID, 'space' );
if( $space_terms ) {
  $space_terms = array();
  foreach( $space_terms as $term ) {
   $space_terms[] = $term->slug;
  }
}

You should specify the logical relationship between each inner taxonomy array when there is more than one.

The relation key in the array describes the relationship. Possible values are OR and AND.

'tax_query' => array(
    'relation' => 'OR',
    array(
        'taxonomy' => 'products-category',
        'field'    => 'slug',
        'terms'    => $course_terms,
    ),
    array(
        'taxonomy' => 'space',
        'field'    => 'slug',
        'terms'    => $space_terms,
    ),
),

Method 2

Simply get all terms first: Here i used property custom post type for example

$property_statu_terms = wp_get_post_terms( $post->ID, 'property_status', array(  'fields' => 'ids' ));
$property_type_terms = wp_get_post_terms( $post->ID, 'property_type', array(  'fields' => 'ids' ));
$property_city_terms = wp_get_post_terms( $post->ID, 'property_city', array(  'fields' => 'ids' ));
$property_state_terms = wp_get_post_terms( $post->ID, 'property_state', array(  'fields' => 'ids' ));
$property_feature_terms = wp_get_post_terms( $post->ID, 'property_feature', array(  'fields' => 'ids' ));

Use relation [OR] or [AND] to get your desired posts.

$query = new WP_Query( array(

    'post_type'             => 'property',
    'posts_per_page'        => 3,
    'orderby'               => 'rand',
    'post__not_in'          => array( $post->ID ),
    'ignore_sticky_posts'   => 1,
    'tax_query' => array(
        'relation' => 'OR',
        array(
            'taxonomy' => 'property_status',
            'field'    => 'id',
            'terms'    => $property_statu_terms,
        ),
        array(
            'taxonomy' => 'property_type',
            'field'    => 'id',
            'terms'    => $property_type_terms,
        ),
        array(
            'taxonomy' => 'property_city',
            'field'    => 'id',
            'terms'    => $property_city_terms,
        ),
        array(
            'taxonomy' => 'property_state',
            'field'    => 'id',
            'terms'    => $property_state_terms,
        ),
        array(
            'taxonomy' => 'property_feature',
            'field'    => 'id',
            'terms'    => $property_feature_terms,
        ),
    ),

));

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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