Profile: Tcoffee

Problem:
The native Bootstrap Carousel will display on each slide one piece of information (we could easily rebuild that in a View loop, but it would always display one post each slide).
What if we want a column structure in each slide, each column representing one post?

Solution:
You would work with 2 post types.
- A "Slides" Post Type (those are the "containers" which hold the columns, hence, the Bootstrap 4 slide items).
- A "Display" post type where you store the information you want to display in each column of each slide (traditionally that would be the posts you want to display in the slider).

The Slides post type is a parent to the Display post type, where you can exactly that many Display posts to a Slide, as you will have columns in each slide.
For example, a 3 column slide means you will have max 3 child Display Posts each Parent Slide Post.

After creating the posts and connections, create a View where you query Slides, and output a raw View loop where you generate the HTML for the Bootstrap 4 slides.
Note that the View LOOP will repeat what is inside the wpv-loop shortcode and hence, you will add the Bootstrap HTML adequately wrapping that Loop and adding IN the loop only the HTML for the slides, but not their content (columns and Display post information). Pay attention to pass a active class by default to the first slide!

The loop of this view should look something like this:

<wpv-loop>
            [wpv-item index=1]
              <div class="carousel-item active">
                //insert Child View here
              </div>
            [wpv-item index=other]
              <div class="carousel-item ">
                //insert child view here
              </div>
          </wpv-loop>

Now create another view for the Display post type, add a query filter to display the Display Posts that are a child to the post set in the parent view, and add in this View loop the HTML for EACH Display Post.
This means, the columns and post Display information is inserted in this loop, which also should be returned raw.

This view is now inserted to the View displaying Slides.
That is the type you will query in the View where you build the slides.

When now the slides view is inserted to a page, you'll see a slider that each slide has N columns (as many you chose to have) each displaying particular post data.

Follow the thread below in detail for a real-life example with the code for the loops, particularly https://toolset.com/forums/topic/boostrap-4-carousel-is-not-working/#post-1301915

Problem: I would like to create a select field with options based on a post's custom field values, and use that field in Contact Form 7.

Solution: Use get_post_meta to get all the values of the custom field for the current post, then loop over those values to build the markup for a select field.

Get the colors postmeta values for this post as an array, then loop over the array items to concatenate the options.
[php]
global $post;
$output = '<select name="color">';
$colors = get_post_meta($post->ID, 'wpcf-color', true); // 3rd param 'true' because we want an array
foreach( $colors as $color) {
  $output .= '<option value="' . $color . '">' . $color . ' </option>';
}
$output .= '</select>';
return $output;

Relevant Documentation:
https://codex.wordpress.org/Function_Reference/get_post_meta
http://php.net/manual/en/language.operators.string.php

Problem: I would like to display archives differently for terms at different levels of hierarchy. For top-level terms, I would like to display archive style A, for second-level (child) terms archive style B, for third-level (grandchild) terms archive style C.

Solution: I think it would be best to set up multiple WordPress Archives. In the "Loops selection" section of these WP Archives, do not select anything. In the Loop Editor of each WordPress Archive, you will create one of the 3 different designs. The first one can be for the parent terms, and it will not include anything in the wpv-loop tags, because you do not want to display posts.

Create a View of Product Category Taxonomy Terms, filtered by term parent, where the term parent is set by the current archive. In the Loop Output section of this View, insert a link to the term archive page. Then insert this View in the WordPress Archive you just created, somewhere outside the wpv-loop tags.

Create another WordPress Archive, and insert the same View of terms outside the wpv-loop tags. Build the product loop inside the wpv-loop tags. This WP Archive will be used to display the child term archive page.

Create a third WordPress Archive, and build the product loop inside the wpv-loop tags.

We offer a filter called wpv_filter_force_wordpress_archive that will allow you to apply a different WordPress Archive to the current archive page, based on some criteria. I have a code snippet that can help. Add this to your child theme's functions.php file:

// utility function to get the hierarchical level of some hierarchical taxonomy term
function get_tax_level($id, $tax){
    $ancestors = get_ancestors($id, $tax);
    return count($ancestors)+1;
}
 
// filter that switches wordpress archives for a specific taxonomy based on term hierarchy
add_filter( 'wpv_filter_force_wordpress_archive', 'switch_tax_archive_by_level', 30, 2 );
 function switch_tax_archive_by_level( $wpa_assigned, $wpa_loop ) {
 $wpa_to_apply = $wpa_assigned;
 $current_taxonomy = isset(get_queried_object()->taxonomy) ? get_queried_object()->taxonomy : null;
  // only for product category taxonomy
  if( !$current_taxonomy || $current_taxonomy != 'product_cat' )
    return $wpa_to_apply;
 
  $current_term_level = get_tax_level(get_queried_object()->term_id, $current_taxonomy);
  if ($current_term_level == 1) {
    // show top-level archive
    $wpa_to_apply = 123;
  } else if ($current_term_level == 2) {
    // show mid-level archive
    $wpa_to_apply = 234;
  } else {
    // show third-level archive
    $wpa_to_apply = 345;
  }
  return $wpa_to_apply;
}

You will modify 123, 234, and 345 to match the numeric ID of the 3 WordPress Archives you want to apply to the 3 different levels of hierarchy. Level 1 corresponds to the parent term, level 2 corresponds to the child term, and level 3 corresponds to the grandchild term.

Relevant Documentation:
https://toolset.com/documentation/programmer-reference/views-filters/#wpv_filter_force_wordpress_archive