Get template part based on custom taxonomy term

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I have a custom post type and I’m trying to call up different variations of the navigation based on the custom taxonomy slug. I’ve done this fairly easily with normal posts, like so: 

<?php 
    if ( is_category( 'mixers' )) {
        include (TEMPLATEPATH.'/nav-mixers.php');
    } elseif ( is_category( 'monitors' )) {
        include (TEMPLATEPATH.'/nav-monitors.php' );
    } elseif ( is_category( 'speakers' )) {
        include (TEMPLATEPATH.'nav-speakers.php');
    }
?>

however this is proving challenging for a custom post type. I feel like I’m close but I need some help now. Here’s where I currently am. 

<?php
    $terms = get_the_terms( $post->id, 'prodcat' ); // get an array of all the terms as objects.
    $terms_slugs = array();
        foreach( $terms as $term ) {
            $terms_slugs[] = $term->slug; // save the slugs in an array
        }
    if( $terms ) :
       get_template_part( 'nav', slug );
    else :
       get_template_part( 'nav', 'home' );
    endif;
?>

Any help is much appreciated!

3 Answers
3

To loop through all the slugs of a term list, simply call get_the_terms() and pull only the slugs:

$slugs = wp_list_pluck( get_the_terms( get_the_ID(), 'prodcat' ), 'slug' );

Then you need to check if you got any results:

if ( ! empty( $slugs ) )

The problem I then see arising is that you got a bunch of slugs in return (unless you restricted the admin meta box to allowing only a single term).

You’d then have to decide on some custom criteria which nav menu you want to have and pull that from the list of $slugs:

// Decide which slug fits and then determine the key:
$key = 0;
get_template_part( 'nav', $slugs[ $key ] );

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