Force authors to Preview a post before publishing

1 comment

1. This is completely untested but I think the concept is good, and good idea too though I’d have an angry mob with pitchforks to face.

   1. Set a marker for your post when the post is previewed. You can save
      it in either $wpdb->options or $wpdb->postmeta. I haven’t
      quite decided which would be better, and it probably depends on
      details of the implementation. (But probably $wpdb->postmeta).
   2. Check that marker before you allow a post to be published.

   So…

   function set_preview_marker_wpse_99671() {
     if (is_preview()) {
       // set the marker
     }
   }
   add_action('pre_get_posts','set_preview_marker_wpse_99671');
   

   Then check the key before you allow publishing.

   // code shamelessly stolen from another answer
   // http://wordpress.stackexchange.com/questions/96762/how-to-make-a-meta-box-field-a-requirement/96767#96767
   function req_meta_wpse_96762($data){
     $allow_pending = false;
     if (isset($_POST['meta'])) {
       foreach ($_POST['meta'] as $v) {
         if ('your_required_key' === $v['key'] && !empty($v['value'])) {
           $allow_pending = true;
         }
       }
     }
     if (false === $allow_pending) {
       $data['post_status'] = 'draft';
     }
     return $data;
   }
   add_action('wp_insert_post_data','req_meta_wpse_96762');
   

   You might want to unset that key when the post is published to force the preview check again if it is edited.

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