I have a custom post type for products and a custom meta checkbox field for ‘Sold’. How can I show the Sold status in a column on the Products edit list and make it sortable (so it would sort all the sold items together) or filter them by the Sold status?
How to show custom (checkbox) field value in admin post list?
i did something similar with some radio buttons and a special taxonomy. i worked almost exclusively from the following 2 tutorials:
http://shibashake.com/wordpress-theme/expand-the-wordpress-quick-edit-menu
http://scribu.net/wordpress/sortable-taxonomy-columns.html
though i was working with a taxonomy, the scribu tutorial actually links to another scribu tutorial on sorting by meta, which is more in-line w/ the OP’s question:
http://scribu.net/wordpress/custom-sortable-columns.html