Check Post Type in custom search to get Woocommerce product attributtes

Question

I am implementing a woocommerce website. In here I am providing a search bar to search only the products.

<form action="<?php echo get_site_url() ?>" method="GET">
    <div class="input-group">
         <input type="search" name="s" class="form-control" placeholder="Search Products" required>
         <input type="hidden" name="post_type" value="products" />
         <div class="input-group-btn">
             <button class="btn btn-default" type="submit">
                <i class="fa fa-search" aria-hidden="true"></i>
             </button>
         </div>
    </div>
</form>

The above search code result in single-product page. In the single product page's sidebar I have a section that shows the product attributes and attribute terms.

The following code is for getting the available product sizes in the current page (product-single)

// get available sizes  for woocommerce sidebar
function getSizes(){
  $sizes = array();
  $codes = array();
  if ( have_posts() ) :
     while ( have_posts() ) : the_post();
     echo get_the_title();
     $product = wc_get_product();
     $attributes = $product -> get_attributes('size');
     foreach ($attributes as $key => $attribute) {
        foreach ($attribute['options'] as $key => $meta) {
          $meta_array = get_term_meta($meta);

          if($meta_array['label']){
            $temp = array();
            $term = get_term($meta);
            foreach ($term as $key => $value) {
              if($key == 'term_id'){
                $temp['term_id'] = $value;
              }
              if($key == 'name'){
                $temp['name'] = $value;
              }
              $temp['attribute'] = 'size';
            }
            foreach ($meta_array['label'] as $key => $value) {
              if (!in_array($value, $codes)){
                $temp['size'] =  $value;
                array_push($sizes,$temp);
                array_push($codes,$value);
              }
            }
          }
        }
     }
   endwhile; endif; return $sizes;
 }

This is the html where I print them in HTML-DOM,

<ul class="w-woo-inner-box">

  <?php $sizes = getaSizes();
      if(!empty($sizes)):
         foreach ($sizes as $key => $size) { ?>
          <li>
            <label class="checkbox inline-block <?php echo checkurlactive($size['attribute'], $size['term_id']); ?>">
                                  <a href="<?php echo generate_filter_url($size['attribute'], $size['term_id']) ?>">
                                    <input type="checkbox" class="">
                                    <label>&nbsp;</label>
            <span><?php echo $size['size']; ?></span>
            </a>
            </label>
          </li>
        <?php }
       else: ?>
            <li class="no-val-found"><span>No sizes found!</span> </li>
    <?php endif; ?>
</ul>

PROBLEM : That was a huge description. Ok now let's look at the problem, from the above code, when I search a existing product name it works fine. But when I search some values from other post types There is an php error on the page mentioning

Fatal error: Call to a member function get_attributes() on boolean in /..../functions.php on line 482

And I tried to debug it and I found that the following loop in getSizes() returning the other post type values,

if ( have_posts() ) :
 while ( have_posts() ) : the_post();

What is the problem here? How can I avoid searching the other post type values?

Answer 1

In your function code you need to check the post type before inside the loop like:

if ( have_posts() ) :
    while ( have_posts() ) : the_post();

        // Check for "product" post type or continue
        if( 'product' !== get_post_type() ) {
            continue; // jump to next post

        the_title();

        // Get an instance of the WC_Product Object
        $product = wc_get_product( get_the_id() );

This will avoid the error you get as $product will always be a WC_Product Object.

---

Bonus addition:

Now the WC_Product method get_attributes() has one argument $context that can have 2 values:

• 'view' (the default value)
• 'edit' (to be used in backend)

But NOT: $attributes = $product -> get_attributes('size');

So if you want to get a specific attribute, you will use WC_Product method get_attribute() intead that will gives a coma separated string of term names like:

        // Get an instance of the WC_Product Object
        $product = wc_get_product( get_the_id() );

        // Loop through 'size' product attribute
        $size_values = $product->get_attribute('size');

        // Convert to an array of term names
        $term_names = (array) explode(', ', $size_values);

        // The product attribute taxonomy (always start with "pa_" + the slug)
        $taxonomy = 'pa_size';

        // Loop through term names
        foreach( $term_names as $term_name ) {
            // Get the WP_Term object (if needed)
            $term = get_term_by( 'name', $term_name, $taxonomy );

            $term_id   = $term->term_id;
            $term_slug = $term->slug;
        }