Problem with Query on Taxonomy

Question

I have a CPT (homepage) and a taxonomy for this CPT that has some fields (about, services ,...) I want to display the posts (and the contents) of each category (of custom taxonomy) in my homepage. but I don't know how do it! Could you please Help me? any helps would be appreciated.

in functions.php:

////////////////////////////////
// CPT - Home Page Content
////////////////////////////////

function cpt_homepage(){
    $labels = array(
        'name'                => 'Home Page Contents',
        'singular_name'       => 'Home Page Content',
        'menu_name'           => 'Home Page Contents'
        'parent_item_colon'   =>  'Parent Home Page Content',
        'all_items'           => 'All Home Page Contents',
        'view_item'           => 'View Home Page Content',
        'add_new_item'        =>'Add New Home Page Content',
        'add_new'             => 'Add New', 
        'edit_item'           =>  'Edit Home Page Content',
        'update_item'         => 'Update Home Page Content',
        'search_items'        =>  'Search Home Page Contents', 
        'not_found'           =>  'Not found',
        'not_found_in_trash'  =>'Not found in Trash',
    );
    $args = array(
        'label'               =>'Home Page Contents',
        'description'         => 'Different Home Page Content, our team may design and develop',
        'labels'              => $labels,
        'supports'            => array( 'title', 'editor', 'thumbnail' ),
        'taxonomies'          => array( 'post_tag' ),
        'hierarchical'        => false,
        'public'              => false,
        'show_ui'             => true,
        'show_in_menu'        => true,
        'show_in_nav_menus'   => true,
        'show_in_admin_bar'   => true,
        'menu_position'       => 2,
        'menu_icon'           => 'dashicons-welcome-view-site',
        'can_export'          => true,
        'has_archive'         => true,
        'exclude_from_search' => false,
        'publicly_queryable'  => true,
        'capability_type'     => 'post',
    );
    register_post_type( 'homepage', $args );
}
add_action( 'init', 'cpt_homepage', 0 );

and In home.php (i wanna somthing like query on taxonomy)

Answer 1

This should works.

$args = array(
    'taxonomy' => 'your_taxonmy_name', // replace with your taxonomy name
);

$categories = get_categories( $args );

$ids = array(); 

// lets get all post IDs
foreach ( $categories as $category ) {
    $args = array(
        'cat' => $category->term_id,
        'post_type' => 'homepage', // your post type
        'posts_per_page' => '1',
        'post__not_in' => $ids, // don't want to any duplication
    );

    $query = new WP_Query( $args );

    if ( $query->have_posts() ) {
        $query->the_post();

        $ids[] = get_the_ID();
    }
}
wp_reset_postdata();

$args = array(
    'post__in' => $ids,
);

$query = new WP_Query( $args );

// your loop for echoing
if ( $query->have_posts() ) {
    while( $query->have_posts() ) {
        $query->the_post();

        // do what you want to
    }
}
wp_reset_postdata();