# File lib/mongo/util/read_preference.rb, line 19 def self.mongos(mode, tag_sets) if mode != :secondary_preferred || !tag_sets.empty? mongos_read_preference = BSON::OrderedHash[:mode => MONGOS_MODES[mode]] mongos_read_preference[:tags] = tag_sets if !tag_sets.empty? end mongos_read_preference end