Loop custom post type by taxonomy (Category)

Question

I created a custom post type in my function.php of the theme and some a taxonomy for them. I added 2 categories in my taxonomy (first, second) and added some post in my new custom post.

I want to make a loop that will select from my custom posts only the ones in the first category (Taxonomy)

Or I want a archive that will display all my custom posts, but separated by the taxonomy like First category: one post, another post Second Category: this post, next post

Answer 1

Before the loop starts use query_posts. Available parameters are here. Something like this:

global $wp_query;
query_posts( array( 
                    'post_type' => 'mycustomname', 
                    'tax_query' => array( 
                                           'relation' => 'AND', 
                                           array( 
                                                  'taxonomy' => 'mytaxonomyname', 
                                                  'field' => 'slug',
                                                  'terms' => array( 
                                                                    'myterm1slug',
                                                                    'myterm2slug' 
                                                                   ) 
                                                ) 
                                        ) 
                  ) 
);    

Answer 2

I guess these will help you: http://codex.wordpress.org/Post_Types#Archive_template and Custom Taxonomy Displays Say you have a taxonomy named 'fiction'. Then your template will be taxonomy-fiction.php. In general, taxonomy-<taxonomy name>.php is the way to go!