使用Mongoose时MongoDB会引起关注

Question

我正在为我的Express.js应用程序使用mongoose模块，每次启动应用程序时都会出现此错误：

========================================================================================
=  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           =
========================================================================================

我无法弄清楚如何设置写入问题。我正在连接到我的数据库：

mongoose.connect('mongodb://localhost/reader')

Answer 1

您想要做的是：

mongoose.connect('mongodb://localhost/reader', {db:{safe:false}})

这将为您提供在mongo驱动程序中发生整个显式写入关注事件之前存在的默认行为。

此处提供更多信息：http://mongoosejs.com/docs/api.html#index_Mongoose-createConnection

Answer 2

这是因为connect-mongodb包。我将其更改为connect-mongo，这解决了问题！