... parameter, 22 6has_one( ) method, 22 0, 22 4:class_name parameter, 22 4:conditions parameter, 22 4:counter_sql parameter, 22 6:dependent parameter, 22 4, 22 6:exclusively_dependent parameter, 22 6:finder_sql ... 20 6, 20 8, 27 3, 27 6first?( ), 24 5foreign key, 21 6has_and_belongs_to_many(), 137, 23 0has_many( ), 96, 22 5, 22 8has_one( ), 22 0, 22 4higher_item( ), 24 5id, 197instance(), 27 1last?( ), 24 5life ... parameter, 23 2:conditions parameter, 23 2:foreign_key parameter, 23 2has_many( ) method, 96, 22 5, 22 8:class_name parameter, 22 6:conditions parameter, 22 6:foreign_key parameter, 22 6:order...