• John Huebner

• September 2, 2016 at 5:05 am

Looking over the ACF add_row() code myself I can tell you that add_row() as it works now can definitely not be used to add a layout to a flexible content field.

The value of a repeater fields meta value is the number of rows in the repeater. The value of a flex fields meta value is a serialized array of layout names. Since add_row() always updates the meta value to a count of rows it cannot function for adding a layout.

It may work if there are 0 layouts, I did not investigate what happens with 0 rows when this line is called.

return (int) acf_update_value( array( $value ), $post_id, $field );

but, if there is a value then this line converts the array of field names to 1

$i = (int) acf_get_metadata( $post_id, $field['name'] );

this can be tested by

echo (int) array('test');

That means that if( !$i ) { is not executed

and then $i is incremented and saved to the meta value

// increase $i
$i++;
// update meta
$result = acf_update_metadata( $post_id, $field['name'], $i );

which overwrites the array for the flex field with an integer, destroying the needed array.