如何在轨道中快速填充*数据相互依赖* 下拉列表？[英]How could *data inter-dependent* dropdowns in rails be populated quickly?

Users need to select a car.
We have several dropdowns when picking a car in order to pick the year, make, model and submodel. Initially we don't know what to use for the select options for make/model/submodel as they are interdependent. We have several dro