How to show feature image of ACF relationship field inside ACF repeater field

Hi,

I have an ACF repeater field containing a relationship field and an image field.

I am able to display the image using an image template object with the value:
[acf field='artworks_0_custom_image_url' post_id="[id]"]

----

I am able to display the post content of the first relationship field item using a HTML template object with the value:
[e2pdf-wp key="artworks_0_artwork" meta="true" path="0"]

and the filter:

function e2pdf_extension_render_artwork_values( $value, $element_id, $template_id, $item, $dataset )
{
if ($value && $template_id == '1') {

if ($element_id == '10') { //HTML object
$related_post = get_post($value, ARRAY_A);
if ($related_post && isset($related_post['post_content'])) {
$output = $related_post['post_content'];
return $output;
} else {
return '';
}
}

}
return $value;
}
add_filter('e2pdf_extension_render_shortcodes_value', 'e2pdf_extension_render_artwork_values', 10, 5);

----

I am having troubles showing the feature image of the relationship field item.

I have tried using an image template object with the value:
[e2pdf-wp key="artworks_0_artwork" meta="true" path="0"]

and the filter:

function e2pdf_extension_render_artwork_values( $value, $element_id, $template_id, $item, $dataset )
{
if ($value && $template_id == '1') {

if ($element_id == '8') { //image object
$related_post = get_post($value, ARRAY_A);
if ($related_post && get_the_post_thumbnail($related_post['ID']) ) {
$output = get_the_post_thumbnail_url($related_post['ID'], 'full');
return $output;
} else {
return '';
}
}

}
return $value;
}
add_filter('e2pdf_extension_render_shortcodes_value', 'e2pdf_extension_render_artwork_values', 10, 5);

The above does not work.

I have also tried using this value directly in the image object:
[e2pdf-wp key="artworks_0_artwork" meta="true" path="0" attachment_image_url="true" size="full"]

Can you advise how I can show the feature image of the relationship field that is inside the ACF repeater object?

Thank you!

This one: [acf field='artworks_0_artwork' post_id="[id]"]

generates the error:

Fatal error: Uncaught Error: Object of class WP_Post could not be converted to string in \wp-content\plugins\advanced-custom-fields-pro\includes\api\api-template.php on line 902

I assume because the returning value is not a String.

This one: [e2pdf-wp key="artworks_0_artwork" meta="true"]

displays in the textarea: a:1:{i:0;s:5:"26828";}

----

The above got me thinking - Something else I tried...

Using this:
[e2pdf-wp key="artworks_0_artwork" meta="true" path="0"]
as the value in an image object displays the correct relationship field ID as the image.

But if I use a filter to try and reference this ID value:

function e2pdf_extension_render_artwork_values( $value, $element_id, $template_id, $item, $dataset ) {

if ($value && $template_id == '1' && $element_id == '8') { //Artwork image

$related_post_id = $value;

write_log('related_post_id = '.$related_post_id);

if (get_the_post_thumbnail($related_post_id)) {
$image_url = get_the_post_thumbnail_url($related_post_id, 'full');
write_log($image_url);
return $image_url;
} else {
return '';
}
}
return $value;
}
add_filter('e2pdf_extension_render_shortcodes_value', 'e2pdf_extension_render_artwork_values', 10, 5);

My log file shows the $value as:

related_post_id = iVBORw0KGgoAAAANSUhEUgAABz0AAACzCAYAAAAT4wHC .... etc

I assume it is bringing in the image data as the $value.

----

Any other clues on how I can get access to the ID in the filter and get this image object to show the feature image?

That worked!

BUT can you confirm if using dynamic shortcodes like this prevents the filters from working?

Since now my post_content filter no longer works. The reason I am using a filter on the post_content is that I concatenate extra ACF group field values, and number formatting:

if ($element_id == '10') { //Artwork text description

//Show Artwork field post title field & price (if any)

$related_post = get_post($value, ARRAY_A);
if ($related_post) {

$image_desc = $related_post['post_content'];

$price_values = get_field('pricing_details', $related_post['ID']);
$retail_price = number_format($price_values['retail_price']); //add thousands comma separator

$output = ($retail_price) ? $image_desc . ', $' . $retail_price : $image_desc;
return $output;

} else {
return '';
}

}

Does this mean the above can no longer work due to the dynamic data shortcodes?

I can confirm that everything is working perfect! I learnt a lot of advanced E2PDF / advanced ACF field integrations from your code responses above.

I hope this helps others too. I learnt E2PDF by reading through other people's questions, hence this post should hopefully help others also!