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I have the following code to obtain products within a category

 $product = new WC_Product($id);

 $categories = $product->get_category_ids(); //return array(21)

 $args = array();

 $args["posts_per_page"] = 10;

 $args["post_type"] = "product";

 $args["post_status"] = "publish";

 $args["category__in"] = $categories;

 $myposts = get_posts($args);

And get_posts return empty when I know there are 5 products in this category

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You can achieve that using the tax_query, see the example in the code below:

$args = array(
  'posts_per_page' => 10,
  'post_type' => 'product',
  'post_status' => 'publish',
  'tax_query' => array(
     'taxonomy' => 'the_taxonomy_slug', //the slug of the taxonomy you want to get
     'field' => 'term_id',
     'terms' => $categories
  ) 
);

See reference in the Codex

  • in terms i put the ids of category o the names? – Miguel Ruiz Bas Jul 18 '17 at 6:36
  • You choose, if you if you see the field key is set to search for the term_id, you can also search for the slug just change the 'field' => 'term_id' to 'field' => 'slug' and in 'terms' you pass the slug of your categories – Cesar Henrique Damascena Jul 18 '17 at 11:34
  • and the 'the_taxonomy_slug' should be category. right? thanksss!! – Miguel Ruiz Bas Jul 18 '17 at 12:03
  • Yep, the_taxonomy_slug is the slug of your taxonomy, in your case is category – Cesar Henrique Damascena Jul 18 '17 at 12:24

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