How to do a loop inside a loop?

Question

I'm trying to get posts from a custom posts using WP_Query.

<ul>
    <?php $query1 = query_posts( array( 'posts_per_page' => -1, 'post_type' => array('specialties') ));
        if(have_posts()): while(have_posts()): the_post();
    ?>
    <li>
        <!-- title from post type specialties -->
        <p><?php the_title(); ?></p>
    </li>
    <?php  
        endwhile; endif; wp_reset_query();
    ?>
</ul>

It's working just fine. Now I need to get posts from another custom post and show inside the already created loop. Now the code looks like this:

<ul>
    <?php $query1 = query_posts( array( 'posts_per_page' => -1, 'post_type' => array('specialties') ));
        if(have_posts()): while(have_posts()): the_post();
    ?>
    <li>
        <!-- title from post type specialties -->
        <p><?php the_title(); ?></p>
        <ul>
            <?php query_posts( array( 'posts_per_page' => -1, 'post_type' => array('team') ));
                if(have_posts()): while(have_posts()): the_post();
            ?>
            <!-- title from post type team -->
            <li><a href="" class=""><?php the_title() ?></a></li>
            <?php  
                endwhile; endif;
            ?>
        </ul>
    </li>
    <?php  
        endwhile; endif; wp_reset_query();
    ?>
</ul>

As you can see, I'm trying to create a loop (inside another loop) to show posts from another custom post, but its not working. I also tried to add wp_reset_query() after the new endif; but it didn't work neither.

What am I doing wrong? I can't figure out what the problem is. Some help would be appreciated.

Have you seen wordpress.stackexchange.com/questions/1753/… — kraftner
– kraftner, Commented Dec 3, 2014 at 20:06
you might need to reset the query before the second query and after it like you did there. — Shawn
– Shawn, Commented Dec 3, 2014 at 20:06
This question (and its answer) might help out: wordpress.stackexchange.com/questions/71724/loop-within-a-loop — Pat J
– Pat J, Commented Dec 3, 2014 at 22:08

Gaius · Accepted Answer · 2014-12-03 22:49:56Z

What if you save each query in a variable ?

<ul>
    <?php $query1 = query_posts( array( 'posts_per_page' => -1, 'post_type' => array('specialties') ));
        if($query1->have_posts()): while($query1->have_posts()): $query1->the_post();
    ?>
    <li>
        <!-- title from post type specialties -->
        <p><?php the_title(); ?></p>
        <ul>
            <?php $query2 = query_posts( array( 'posts_per_page' => -1, 'post_type' => array('team') ));
                if($query2->have_posts()): while($query2->have_posts()): $query2->the_post();
            ?>
            <!-- title from post type team -->
            <li><a href="" class=""><?php the_title() ?></a></li>
            <?php  
                endwhile; endif;
            ?>
        </ul>
    </li>
    <?php  
        endwhile; endif; wp_reset_query();
    ?>
</ul>

Is this a comment on the question or an actual answer? If it is an answer, please file an edit and explain why that would help. Please also read why one shouldn't use query_posts(). — kaiser
– kaiser, Commented Dec 3, 2014 at 23:43

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