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I am working on a theme which contains a custom post type with custom fields.

Everything is working perfectly except the when a new custom post is added, the custom fields for the first custom post and first one only are wiped.

function save_details(){  
    global $post;  
    update_post_meta($post->ID, "testimonyname", $_POST["testimonyname"]);
add_action('save_post', 'save_details'); 

This is what i am using to save the custom field data

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Where exactly are you calling the save_details function? Or is it hooked into something? Do you mean you're using custom fields? Or did you create a custom meta box for your post type? – chrisguitarguy Sep 28 '11 at 13:21
sorry, i added a meta box for the post type. I have updated the code with the function call – Ashley Staggs Sep 28 '11 at 13:24

First of all, save_post has an argument $post_id, so there's no need to global $post. In some cases, $post might not actually be set (anymore) when you do this, which is probably why it breaks. Second, you should probably check whether you're storing a revision or not (see below). So your code should look like this:

function save_details( $post_id ){  
    if ( wp_is_post_revision( $post_id ) )
        $post_id = wp_is_post_revision( $post_id );

    update_post_meta( $post_id, "testimonyname", $_POST["testimonyname"] );
add_action('save_post', 'save_details', 10, 1); 
share|improve this answer
From my tests this answer works perfectly. Thanks – Ashley Staggs Sep 28 '11 at 14:24
Can i ask what the 10,1 is for in the save_post action? – Ashley Staggs Sep 28 '11 at 14:26
The 10 is the priority, the 1 is the number of variables that is passed on, in this case 1 :) – Joost de Valk Sep 28 '11 at 14:33
Sorry, but after more extensive testing it didn't work – Ashley Staggs Oct 9 '11 at 18:46
up vote 0 down vote accepted

the problem was worse than I thought.

Here is the solution: Add New Post (Custom Post Type) Deletes 1 Post's Custom Meta Data

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The above answer by Joost didn't work for me. Instead I found changing the action from save_post to post_updated solved my problem.

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