updating meta_key from the frontend

I don’t have time for a detailed reply but some ideas:

1) Use arrays in the front end. Make your input ID’s like add_task_assigned[] and add_task_complete[] – these appear as arrays in the back end. It’s not great practice, but it works.

2) Use an array in the backend. Store the meta as

array(
[0] => array( 'assigned' => true, 'completed' => true ),
[1] => array( 'assigned' => true, 'completed' => false )
)

3) As we’re not quite sure how you’ve structured the HTML, the serialize method of jQuery UI sortable may also be handy: http://api.jqueryui.com/sortable/#method-serialize

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