difference
ReQL command: difference
Command syntax
array.difference(array) → array
Description
Remove the elements of one array from another array.
Example: Retrieve Iron Man’s equipment list without boots.
r.table('marvel').get('IronMan')[:equipment].difference(['Boots']).run(conn)
Example: Remove Iron Man’s boots from his equipment.
r.table('marvel').get('IronMan')[:equipment].update{ |doc| {:equipment => doc['equipment'].difference(['Boots'])} }.run(conn)
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https://rethinkdb.com/api/ruby/difference/