我的应用程序在本地运行,但在生产环境中我似乎无法使用mongoose从mongo获取特定内容。我试过:varCoach=mongoose.model('Coach',CoachSchema);Coach.findOne({_id:req.session.userId},function(err,coach){})Coach.find({_id:req.session.userId},function(err,coach){})Coach.findById(req.session.userId).exec(function(err,coach)){})我收到了同样的错误:模型“Coach