ACF Field Group Relationships - How to output a certain relationship value

Question

I have 3 custom post types:

• Team Member
• Team Group
• Service
  
  

Each CPT have own Field Group in ACF as below:

• Team Member (related_team_member)
• Team Group (related_team_group)
• Service (related_service)

All those fields are connected by relationship in ACF, so structure looks like this

John Doe -> Photography -> Location Shoots, Studio Shoots, Retouching
John Doe -> Videography -> Basic Filming, Drone Shoots, Postproduction

So, to explain this, one of the team members belongs to both groups Photography and Videography and he provides 6 services, 3 different services for each group.

Now, I have a few pages where I would like to output the team members data.

single-team-members.php
I'm outputting single team member data here, so on John's Doe card I have his Picture, Name, Groups he belong to (Photography, Videography) and all services he provides and this is done. A bit simplified while loop below:

while(have_posts()) {
    the_post(); ?>
                <h2><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>
                <h3 class="member-group"><?php
                    $relatedGroups = get_field('related_group');
                        if ($relatedGroups) {
                            echo '<ul class="member-group__list">';
                            foreach($relatedGroups as $group) { ?>
                            <li><a href="<?php echo get_the_permalink($group); ?>"><?php echo get_the_title($group); ?></a><span class="member-group__divider">,&nbsp</span></li>
                        <?php
                            } echo '</ul>';
                        }?>
                </h3>
                <p><?php the_content(); ?></p>

                <?php
                    $relatedServices = get_field('related_service');
                        if ($relatedServices) {
                            echo '<ul>';
                        foreach($relatedServices as $service) { ?>
                        <li><a href="<?php echo get_the_permalink($service); ?>"><?php echo get_the_title($service); ?></a></li>
                    <?php }
                        echo '</ul>';
                    }?>
     <?php }

page-all-team.php
Here I have all team members cards where each card have outputted Picture, Name and the Group they belong to and here I outputted all groups they belongs to so for John is "Photography, Videography"

$relatedTeamMembers = new WP_Query(array(
    'posts_per_page' => -1,
    'post_type' => 'team-member',
    'orderby' => 'title',
    'order' => 'ASC',
    'meta_query' => array(
    array(
        'key' => 'related_team_group',
        'compare' => 'LIKE',
        'value' => array()
    )
    )
));

if ($relatedTeamMembers->have_posts()) {
        while($relatedTeamMembers->have_posts()) {
            $relatedTeamMembers->the_post(); ?>
                <a href="<?php the_permalink(); ?>"><div class="team-member">
                    <div class="team-member__label-gold">
                        <div class="team-member__label-gold__name"><?php the_title(); ?></div>
                        <div class="team-member__label-gold__service">
                            <?php
                            $groups = get_field('related_team_group');
                                foreach($groups as $group){
                                echo $group->post_title;
                                }?>
                        </div>
                    </div>
                </div></a>
        <?php }
}

page-photography.php
On this page I would like to output:

• services that John Doe offers in Photography group so: Location Shoots, Studio Shoots, Retouching
  
• Only one Group Name = Photography

page-videography.php
On this page I would like to output:

• services that John Doe offers in Videography group so: Basic Filming, Drone Shoots, Postproduction
  
• Only one Group Name = Videography

page-aerial-shooting.php
On this page I would like to output:

• Only one John's group = Videography
• Only two services he offers = Drone Shoots, Postproduction

Answer 1

When using the "post object" field of ACF, you will get a post object if you use the get_field function.

You can use the get_field function with the ID of the post, to get the field you want of this specific post (targeted by the ID). So if you want to output a field called "myfield" , you can use the IDs you got in the "post object" field.

Please notice to use a correct foreach loop, using services as service (single).

$services = get_field('related_service');
foreach($services as $service):
    $myfield = get_field('myfield', $service->ID); // using id of single post object
    echo $myfield;
endforeach;