Adding a Group causes an warning: Argument #2 should be an array

This topic has 6 replies, 2 voices, and was last updated 1 year, 1 month ago by Purdue Alumni Association.

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Topic
October 4, 2018 at 12:59 AM #11521
Resolved Purdue Alumni Association
Participant
I am using the builder to create a custom meta box with a group. I get the following error when trying to save:
```
Warning: array_map(): Argument #2 should be an array in [my-site-info]/wp-includes/post.php on line 2072

Warning: Cannot modify header information - headers already sent by (output started at [my-site-info]/wp-includes/post.php:2072) in [my-site-info]/wp-includes/pluggable.php on line 1219
```
If I remove the group the data saves successfully.

Please help.
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October 4, 2018 at 4:51 PM #11533

Anh Tran
Keymaster

Hi Purdue,

I guess the problem comes from the group settings. Please share the code of the meta box for debugging.

October 4, 2018 at 7:15 PM #11538
Purdue Alumni Association
Participant
I am using all the default settings. By simply placing an empty group in the Fields area I get the error.
```
add_filter( 'rwmb_meta_boxes', 'your_prefix_register_meta_boxes' );
function your_prefix_register_meta_boxes( $meta_boxes ) {
    $meta_boxes[] = array (
        'title' => 'Test Box',
        'id' => 'test-box',
        'post_types' => array(
            'page',
        ),
        'context' => 'normal',
        'priority' => 'high',
        'fields' => array(
        ),
    );
    return $meta_boxes;
}
```
(Looking closer at the code above I see that an empty group is not even output into the Code tab.)

Even with a more realistic example (a group with a field inside it), I still get the error.
```
add_filter( 'rwmb_meta_boxes', 'your_prefix_register_meta_boxes' );
function your_prefix_register_meta_boxes( $meta_boxes ) {
    $meta_boxes[] = array (
        'title' => 'Test Box',
        'id' => 'test-box',
        'post_types' => array(
            'page',
        ),
        'context' => 'normal',
        'priority' => 'high',
        'fields' => array(
            
            array (
                'id' => 'group_2',
                'type' => 'group',
                'name' => 'Group',
                'fields' => 
                array (
                    0 => 
                    array (
                        'id' => 'text_2',
                        'type' => 'text',
                        'name' => 'Text Field',
                    ),
                ),
                'default_state' => 'expanded',
            ),
        ),
    );
    return $meta_boxes;
}
```
October 5, 2018 at 9:29 AM #11546

Anh Tran
Keymaster

Hi Purdue,

Thanks a lot for bug reporting. I can replicate the bug in the Meta Box Builder (it’s a bug in the Builder, not in the Group extension). I’ll fix and release a new version soon.

October 5, 2018 at 7:41 PM #11547

Purdue Alumni Association
Participant

Great. I look forward to the update.

October 6, 2018 at 8:53 AM #11553

Anh Tran
Keymaster

Hi, I’ve just updated the plugin. Please check it.

Thanks

October 8, 2018 at 8:40 PM #11570

Purdue Alumni Association
Participant

That seems to have worked. I will let you know if I experience any issues using it in production, but thank you for your quick reply and fix!
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