我正在为Express.js应用程序使用mongoose模块，并且每次启动该应用程序时都会不断收到此错误：
========================================================================================
= Please ensure that you set the default write concern for the database by setting =
= one of the options =
= =
= w: (value of > -1 or the string 'majority'), where < 1 means =
= no write acknowlegement =
= journal: true/false, wait for flush to journal before acknowlegement =
= fsync: true/false, wait for flush to file system before acknowlegement =
= =
= For backward compatibility safe is still supported and =
= allows values of [true | false | {j:true} | {w:n, wtimeout:n} | {fsync:true}] =
= the default value is false which means the driver receives does not =
= return the information of the success/error of the insert/update/remove =
= =
= ex: new Db(new Server('localhost', 27017), {safe:false}) =
= =
= http://www.mongodb.org/display/DOCS/getLastError+Command =
= =
= The default of no acknowlegement will change in the very near future =
= =
= This message will disappear when the default safe is set on the driver Db =
========================================================================================
我不知道如何设置写关注。我正在这样连接到我的数据库：
mongoose.connect('mongodb://localhost/reader')
最佳答案
您想要做的是：
mongoose.connect('mongodb://localhost/reader', {db:{safe:false}})
这将为您提供在mongo驱动程序中发生全部显式写操作之前的默认行为。
此处更多信息：http://mongoosejs.com/docs/api.html#index_Mongoose-createConnection