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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:

$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 Answers

up vote 5 down vote accepted

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(); ?>
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One thing—is the return statement supposed to be in { }? –  supertrue May 6 '11 at 19:11
1  
The { } around the return statement is optional. In PHP, omitting those brackets will apply the if() conditional only to the immediate next line. –  EAMann May 6 '11 at 19:25
    
Is it possible to return a custom field value using a statement like this? In the codex entry on WP_Query it only talks about custom fields in the context of using them as parameters for the query. –  supertrue May 6 '11 at 19:52
    
Or, do I have to rewrite it as, e.g., if ( $query->have_posts() ) : while ( have_posts() ) : the_post(); ?> Post stuff here. <?php endwhile; endif; wp_reset_postdata(); so that I can show elements as is done with query_posts? –  supertrue May 6 '11 at 19:56
    
$custom_field_value = get_post_meta($post->ID, 'Custom field name', true); –  supertrue May 6 '11 at 20:00
show 1 more comment

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
    //....
}
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