What kind of object type is WP_Query?

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I am getting this error when I try to return the post_title value from my WP_Query: 

**Fatal error:** Cannot use object of type WP_Query as array

Here is the code:

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$query = new WP_Query( array( 'meta_key' => 'Old ID', 'meta_value' => $atts['oldid'] ) );
return $query['post_title'];

How can I show the elements of the post after this query? I am using WP_Query because I am making a shortcode to be used within Posts and Pages.

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2 comments

  1. I’m not sure you understand the logic of WP_Query. Rather than explain in words, here’s a code example;

    $query = new WP_Query( array( 'meta_key' => 'Old ID', 'meta_value' => $atts['oldid'] ) );
if ( $query->have_posts() )
    return $query->posts[0]->post_title;

return '';

    Check out the codex on interacting with WP_Query.

    UPDATE: To use the query as you would normally, i.e. The Loop;

    <?php if ( $query->have_posts() ) : ?>

    <?php while ( $query->have_posts() ) : $query->the_post(); ?>

        <a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>

    <?php endwhile; ?>

<?php endif; ?>
<?php wp_reset_postdata(); ?>

  2. the error you get means that you are using an object as an array, if you want to access an object element use -> and not [] so $query->post_title

    but that wont work either, you need to loop over the post 

    while ($query->have_posts()){
    $query->the_post();
    //here you can use the post data with the $post object
    //$post->post_title
    //$post->content
    //....
}