WordPress: Loop through Categories and Display Posts Within

gistfile1.php

<?php
/*
 * Loop through Categories and Display Posts within
 */
$post_type = 'custom_post_name_here';
 
// Get all the taxonomies for this post type
$taxonomies = get_object_taxonomies( array( 'post_type' => $post_type ) );
 
foreach( $taxonomies as $taxonomy ) :
 
    // Gets every "category" (term) in this taxonomy to get the respective posts
    $terms = get_terms( $taxonomy );
 
    foreach( $terms as $term ) : ?>

        <?php
        $args = array(
                'post_type' => $post_type,
                'posts_per_page' => -1,  //show all posts
                'tax_query' => array(
                    array(
                        'taxonomy' => $taxonomy,
                        'field' => 'slug',
                        'terms' => $term->slug,
                    )
                )
 
            );
        $posts = new WP_Query($args);
 
        if( $posts->have_posts() ): ?> 
        
         <?php echo $term->name; ?>
         
        <?php while( $posts->have_posts() ) : $posts->the_post(); ?>
 
                    <?php if(has_post_thumbnail()) { ?>
                            <?php the_post_thumbnail(); ?>
                    <?php }
                    /* no post image so show a default img */
                    else { ?>
                           <img src="<?php bloginfo('template_url'); ?>/assets/img/default-img.png" alt="<?php echo get_the_title(); ?>" title="<?php echo get_the_title(); ?>" width="110" height="110" />
                    <?php } ?>
 
                   <?php  echo get_the_title(); ?>
 
                        <?php the_excerpt(); ?>
                   
 
        <?php endwhile; endif; ?>
 
    <?php endforeach;
 
endforeach; ?>