Haystack

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Haystack has built in filters that allow you to change some defined variables that represent your web page. Currently the filters haystack_set_type, haystack_set_image, haystack_set_body, and haystack_set_tags have been enabled. These functions are passed the ID of the post, and the returned data will be sent to elasticsearch. Here are two examples set in a user's theme folder in their functions.php file: //We want type here to show much more data than the average function _haystack_set_type($id) { //Adding post type as the first of the tags to pass $post_type = get_post_type($id); $post_type = get_post_type_object($post_type); $tags[] = array($post_type->labels->singular_name); //Adding the post author as the second part of the tags array to pass $post_auth = get_post($id); $post_auth = $post_auth->post_author; $tags[] = get_the_author_meta('nicename',$post_auth); //Adding categories to the array $post_cat = wp_get_post_categories($id); foreach ($post_cat as $c) { $cat = get_category($c); $tags[] = $cat->name; } //Adding tags associated with the post, if they exist $post_tags = wp_get_post_tags($id); foreach ($post_tags as $key => $val) { $tags[] = $val->name; } //Return in tags return (!empty($tags) ? ''.implode('',$tags).'' : ''); } //Apply the filter add_filter('haystack_set_type','_haystack_set_type'); The second example here hooks in and replaces all images with a static one: //Add a sample image to each Haystack post item. Image could alternately be fetched from the ID function _haystack_set_image($id) { return 'http://www.gallaghersmash.com/wp-content/uploads/2015/04/gallagher.jpg'; } //Apply the filter add_filter('haystack_set_image','_haystack_set_image');