[Resolved] Previous andnext post links, but limited to the same parent

[Author]

Posts

[Marcel]

I'm want to add links to the next and previous post on a single artworks page such as this one: hidden link.

As you can see, I got that working, using the [wpv-post-previous-link] and [wpv-post-next-link] shortcodes. However, those will link to posts from different parents as well, whilst I need them to only link to posts from the same parents.

I did find this topic: https://toolset.com/forums/topic/how-to-show-next-previous-child-post/, but I'm not sure which instances of "parent" and "child" I should replace with my posts slug. Also, that topic is 4 years old, so maybe there's native support for this by now?

[Christian Cox]

Hello, there's no native support for this in the current software, but there is an updated code snippet available for post relationships in Types 3+. You can find that updated code here with examples:
https://toolset.com/forums/topic/next-and-previous-sibling-posts-in-a-one-to-many-post-relationship/

The syntax has changed and you only need to know the relationship slug now, not the post type slugs for parent and child. Let me know if you have questions about this.

[Marcel]

Thanks Christian. I just need a bit more help: I want the links to say "previous" and "next" instead of the post title. I guess I need to replace the $title in this rule":

$link .= "" . $title . "";

but with what?

[Christian Cox]

Okay sure, to display "Next" or "Previous" as the link text, instead of the post title, you can replace this code:

// create link to next/previous sibling
  if(isset($siblings[$i])){
    $perm = get_the_permalink( $siblings[$i] );
    $title = get_the_title( $siblings[$i] );
    $link .= $a['step']=='1' ? "Next: " : "Previous: ";
    $link .= "<a href='" . $perm . "'>" . $title . "</a>";
  }

...with this update:

// create link to next/previous sibling
  if(isset($siblings[$i])){
    $perm = get_the_permalink( $siblings[$i] );
    $linktext = $a['step']=='1' ? "Next" : "Previous";
    $link .= "<a href='" . $perm . "'>" . $linktext . "</a>";
  }

Let me know if this does not resolve the issue for you.

[Marcel]

Hi Christian,

That seems to work, thanks. However, the original part of the code does code a fatal error when I try to edit the template:

Fatal error: Uncaught InvalidArgumentException: All provided arguments for a related element must be either an ID or a WP_Post object. in /home/artandcommunication.nl/public_html/artcommunicators/wp-content/plugins/toolset-blocks/vendor/toolset/toolset-common/inc/autoloaded/interop/commands/RelatedPosts.php:246 Stack trace: #0 /home/artandcommunication.nl/public_html/artcommunicators/wp-content/plugins/toolset-blocks/vendor/toolset/toolset-common/inc/autoloaded/interop/commands/RelatedPosts.php(177): OTGS\Toolset\Common\Interop\Commands\RelatedPosts->set_query_by_elements(Array, 'parent') #1 /home/artandcommunication.nl/public_html/artcommunicators/wp-content/plugins/toolset-blocks/vendor/toolset/toolset-common/inc/public_api/m2m.php(110): OTGS\Toolset\Common\Interop\Commands\RelatedPosts->__construct(0, 'artist-artwork', Array) #2 /home/artandcommunication.nl/public_html/artcommunicators/wp-content/themes/Avada-Child-Theme/functions.php(40): toolset_get_related_posts(0, 'artist-artwork', Array) #3 /home/artandcommunicati in /home/artandcommunication.nl/public_html/artcommunicators/wp-content/plugins/toolset-blocks/vendor/toolset/toolset-common/inc/autoloaded/interop/commands/RelatedPosts.php on line 246
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[Shane]

Hi Marcel,

Christian is currently on a public holiday today but he will be back tomorrow to continue assisting you with this one.

Thank you for the patience and understanding.

[Christian Cox]

Okay I think I will need to take a closer look at how this is implemented on your site to be able to give you an update. Is the theme editable in wp-admin? If so, I can log in and check it out. Please provide login credentials in the private reply fields here and I'll take a look.

[Christian Cox]

Okay I edited your child theme's functions.php file and added the last three lines of code here after the $sibling_args array. This conditional structure will prevent fatal errors in the Block Editor when the parent ID is false-y because wpv-post-id has no related parent post ID for any reason:

$sibling_args = array(
    'query_by_role'=>'parent',
    'limit'=>1000,
    'role_to_return'=>'child',
    'orderby'=>'title'
  );
  // prevent fatal errors: see https://toolset.com/forums/topic/previous-en-next-post-links-but-limited-to-the-same-parent/
  if( !$parent_id )
	  return;

Now it seems to be functioning as expected in a few quick tests on the front-end. Can you confirm?

By the way, as long as you're in there, could you also check on this issue please? https://toolset.com/forums/topic/html-gets-corrupted-everytime-i-open-the-template/

Our policy is to address one issue per ticket, so I would prefer to continue discussing the sibling navigation issue in the current ticket. It looks like the other ticket was closed without a real resolution, so I will reopen that ticket momentarily and ask Jamal to follow up with you.

[Marcel]

My issue is resolved now. Thank you!