Can't Get the Terms from My Posts!

(I’m actually using 3.0.3, but the popup can’t count that high).

In any case, I have written a plugin that lists posts within a page or a post, so the implementor can mix static content with dynamic. No big deal, but very, very useful.

I need to extend this to allow posts to be listed if they are part of a series, in the excellent organize-series plugin. I already have this working for categories. I haven’t (yet) extended it to tags, but I need to do this for series.

Here’s the code of what I am trying:

$posts = get_posts(array('numberposts' => -1));
foreach ( $posts as $mypost )
	{
	$should_list = false;
	if ( function_exists ( taxonomy_exists ) && taxonomy_exists ( 'series' )
		&& function_exists ( get_series_ID )
		&& is_array ( $options['series_list'] )
		&& count ( $options['series_list'] )
		)
		{
		$terms = wp_get_object_terms ( $my_post->ID, 'series' );
		foreach ( $options['series_list'] as $series_term )
			{
			$ser_ID = get_series_ID ( $series_term );
			if ( $ser_ID )
				{
				$series_term = $ser_ID;
				}

The problem is in this line:

$terms = wp_get_object_terms ( $my_post->ID, 'series' );

The ‘series’ term exists, and lots of posts are tagged with various tags.

However, I ALWAYS get an empty array as a function return from wp_get_object_terms. I have tried wp_get_post_terms, everything.

The $my_post is not within the loop. It can’t be. We’re already inside another post.

I’m sure that I’m making some boneheaded mistake. Anyone able to set me straight?