ruby on rails 4 - where.not() not working on arrays -

i have array called user_ids , want select records user_ids not in array.

here used:

mymodel.where.not(user_id: user_ids) 

but got error wrong number of arguments (0 1).

same thing happens when used mymodel.where.not('user_id=?', user_ids). thought maybe becuase array empty, same thing happens arrays not empty.

does know why happens?

i using rails 4.

you should try this:

mymodel.where('user_id not in (?)', user_ids)