Rails 3 ActiveRecord query using both SQL IN and SQL OR operators

I'm writing a Rails 3 ActiveRecord query using the "where" syntax, that uses both the SQL IN and the SQL OR operator and can't figure out how to use both of them together. This code works (in my User model): Question.where(:user_id => self.friends.ids) #note: self.friends.ids returns an array of integers but this code Question.where(:user_id => self.friends.ids OR :target => self.friends.usernames