我正在尝试从以下格式的嵌套数组文档中投影值。我希望只显示在查找查询中选择的特定specType的specValue。{"carId":"345677""car":{"model":[{"specs":[{"specType":"SEDAN""specValue":"1"},{"specType":"BR_INC""specValue":"yes"},{"specType":"PLAN""specValue":"gold"}]}]}}ThisiswhatIhavetried.db.cars.find({carId:'345677','car.model.specs.specType':'