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1. futurepocket
   Member
   Posted 1 year ago #

   Hi,
   I want to add a conditional custom field to my posts (by adding to functions.php). I need to basically add a custom field to all posts automatically, if one hasn't already been added.

   I found this code:

   <?php $songs = get_post_meta($post->ID, 'songs', true);
   /checking if anything exists for the key Songs
   if ($songs) { ?>
   Listening to: <?php echo $songs; ?>
   <?php } //if there is nothing for songs then display
   else { ?>
   Listening to: Nothing (Grooveshark is under maintenance)
   <?php } ?>

   I need to modify that however to add an "Image" custom field, how would I do that? Thanks.

2. businesslogs
   Member
   Posted 1 year ago #

   Not sure if I understand you correctly but you want to set a specific custom field value for the custom field key 'Images' to ALL existing posts? You probably need to use update_post_meta while looping over all your posts in a custom query.

3. Nalin
   Member
   Posted 1 year ago #

   Try this

   <?php
   $songs = get_post_meta($post->ID, 'songs', true);
   //checking if anything exists for the key Songs
   if ($songs != '') { ?>
   <img src="<?php echo $songs;?>" />
   <?php } //if there is nothing for songs then display
   else { ?>
   <img src="your default image path" />
   <?php } ?>

4. Nalin
   Member
   Posted 1 year ago #

   or you you can try this in smart way. improve loading speed aswell.

   first create the image container
   <div class="song_thumb"> </div>

   give your default image as background from css.

   and put this code within the div

   <?php
   $songs = get_post_meta($post->ID, 'songs', true);
   //checking if anything exists for the key Songs
   if ($songs != '') { ?>
   <img src="<?php echo $songs;?>" />
   <?php } ?>

   use this plugin to create image thumbnails for your post http://www.seoadsensethemes.com/wordpress-wp-post-thumbnail-plugin/

5. futurepocket
   Member
   Posted 1 year ago #

   No no, I want to auto-add a custom field to all posts hereon ONLY if the custom field doesn't already exist.

   E.g., If I forget to create a custom field called "Image", then this function should automatically add a custom field called "Image" and auto-insert a default value (which I want to be able to define).

   I've checked out the code to auto-add custom fields within posts upon publish:

   add_action('publish_page', 'add_custom_field_automatically');
   add_action('publish_post', 'add_custom_field_automatically');
   function add_custom_field_automatically($post_ID) {
       global $wpdb;
       if(!wp_is_post_revision($post_ID)) {
           add_post_meta($post_ID, 'field-name', 'custom value', true);
       }
   }

   How would I add an IF command within that code to ONLY add the 'field-name' and 'custom-value' if one doesn't exist already?

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