ACF repeater field usage

Question

I have a Custom post type "event" it has a repeater field "event_session" that has 4 subfields "session_start", "session_title", "session_description", "session_speaker" (a post object relationship with CPT Speaker.

I'm trying to create a page that will load the subfields. This is what i've tried:

<?php

    $args = array(
        'post_type' => 'event'
    );

    $the_query = new WP_Query( $args );
?>


<!-- WP_Query WordPress loop -->
<?php

// check if the repeater field has rows of data
if( have_rows('event_session') ):

    // loop through the rows of data
    while ( have_rows('event_session') ) : the_row();

        // display a sub field value
        the_sub_field('session_start');

    endwhile;

else :

    // no rows found

endif;

?>

The problem is that i cant pull the relational data from CPT speaker. How do i get the title and company name (fields from "speaker) into this page?

NEW CODE:

<?php

    $args = array(
        'post_type' => 'event'
    );

    $the_query = new WP_Query( $args );
?>


<!-- WP_Query WordPress loop -->
<?php if ( $the_query->have_posts() ) : while ( $the_query->have_posts() ) : $the_query->the_post(); ?>

    <?php if(get_field('event_session')): ?>
        <?php while(has_sub_field('event_session')): ?>
                <strong><?php the_sub_field('session_start'); ?>  </strong><?php the_sub_field('session_title'); ?><br>
<?php   

$eventspeakers = get_sub_field("session_speaker");
if ($eventspeakers && count($eventspeakers)>0)
{
    foreach ($eventspeakers as $eventspeaker)
    {
$speaker = get_post($eventspeaker);
echo'speaker is'.$speaker->post_title; 


    }        
}   
?>
        <?php endwhile; ?>
    <?php endif; ?>

<?php endwhile; else: ?>

    <!-- Displayed if no posts or pages are available -->
    <p>There are no posts or pages here!</p>

<?php endif; ?> 

This results in pulling the speaker posts title, but repeats it many times. One event looks like this:

8:00AM Registration & Breakfast speaker isChristian Kochspeaker isspeaker isspeaker isspeaker isspeaker isspeaker is2015speaker isspeaker isspeaker isspeaker is2015speaker isspeaker is2015speaker is2015speaker isspeaker isspeaker is2015speaker is2015speaker isspeaker is2015speaker isspeaker is2015speaker is2015speaker is

Answer 1

Simply use get_sub_field("session_speaker"); function to retrieve that data. As you've said this is a relational field, it will return an array of post objects according to the docs.

In order to get data from each speaker, you need to loop through the resulting array. Example:

$speakers = get_sub_field("session_speaker");
if ($speakers && count($speakers)>0)
{
    foreach ($speakers as $speaker)
    {
        echo $speaker->ID; //$speaker is a post object//
    }        
}