Display only the latest post

Question

There seems to be something wrong with the logic of what I'm doing.

I just want to display the latest post in a custom term. But instead I'm displaying every post for that term, even though I am using posts_per_page => 1

I have a taxonomy called "twin" and the term "double portrait", I have 2 posts in a category called "celebrity", both with the term "double portrait". The code I have outputs in the right category fine, but as I say it's outputting for each post instead of just the one.

Here's the code I'm using:

 $post_type = 'post';

  $taxonomies = get_object_taxonomies( (object) array( 'post_type' => $post_type ) );

  foreach( $taxonomies as $taxonomy ) : 

    $terms = get_terms( $taxonomy );

  foreach( $terms as $term ) : 

    $args = array(
      'tax_query' => array(
        array(
          'taxonomy' => $taxonomy,
          'field' => 'slug',
          'terms' => $term->slug
          )
        ),
      'posts_per_page' => 1,
      'ignore_sticky_posts' => true, 
      'orderby' => 'modified',
      );

  $posts = new WP_Query( $args );

  if( $posts->have_posts() ): while( $posts->have_posts() ) : $posts->the_post();
  if(in_category($str)) {
    if(has_term('double portrait','twin')) {
        echo the_excerpt();
    }

  }

  endwhile; endif;

  endforeach;

  endforeach;

Answer 1

Your query arguments, formatted to be readable, look like this:

$args = array(
  'taxonomy' => $taxonomy, 
  'term' => $term->slug, 
  'posts_per_page' => 1, 
  'orderby' => 'modified',
  'category' => $str 
);

That does not match any argument pattern I see for WP_Query. I think you are trying to construct a tax_query but that should look like this:

$args = array(
  'tax_query' => array(
    array(
      'taxonomy' => $taxonomy,
      'field' => 'slug',
      'terms' => $term->slug
    )
  ),
  'posts_per_page' => 1,
  'ignore_sticky_posts' => true, 
  'orderby' => 'modified',
  'category' => $str 
);

I am not sure why you have a tax_query and a category argument. Perhaps that is a mistake, perhaps you want an AND or OR relationship between the taxonomies. I am not sure.

I suspect that you also want ignore_sticky_posts so I added that.