How to display a feature only if custom field value is set?

Question

What i'm trying to do here is to modify the existing wp-postratings plugin. The function to display the ratings is:

<?php if(function_exists('the_ratings')) { the_ratings(); } ?>

However, the above code displays the ratings on every post. What would be the conditional statement to add such that if a post has a custom field with name/value as ratings/yes

This way, based on the conditional statement, the ratings would be displayed only on posts where the custom field has the ratings/yes added.

Answer 1

<?php
// get the value of our custom field
$meta_value = get_post_meta($post->ID, 'ratings', true);
// if it's not empty and the_ratings function exists:
if( !empty($meta_value) && function_exists('the_ratings') ){
    the_ratings();
}