nodejs使用connect-mongodb报错(Please ensure that you set the default write concern)
原本是使用connect-mongo
的,可能是express版本号的升级报错了。改用connect-mongodb
。可是使用后出现了例如以下的警告:
G:\nodejs\moviesite>grunt
Running "concurrent:tasks" (concurrent) task
Running "nodemon:dev" (nodemon) task
Running "watch" task
Waiting...
[nodemon] v1.3.7
[nodemon] to restart at any time, enter `rs`
[nodemon] watching: *.*
[nodemon] starting `node app.js`
============================================================================
============
= 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 acknowledgement
=
= journal: true/false, wait for flush to journal before acknowledgement
=
= fsync: true/false, wait for flush to file system before acknowledgemen
t =
=
=
= For backward compatibility safe is still supported and
=
= allows values of [true | false | {j:true} | {w:n, wtimeout:n} | {fsync:t
rue}] =
= 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 acknowledgement will change in the very near future
=
=
=
= This message will disappear when the default safe is set on the driver Db
=
============================================================================
============
Sat, 27 Jun 2015 12:49:12 GMT express-session deprecated undefined resave option
; provide resave option at app.js:20:9
Sat, 27 Jun 2015 12:49:12 GMT express-session deprecated undefined saveUninitial
ized option; provide saveUninitialized option at app.js:20:9
moviesite started on port 3000
下边的警告在session中加入两个属性值restart和saveUninitialized就可以解决。
Sat, 27 Jun 2015 12:49:12 GMT express-session deprecated undefined resave option
; provide resave option at app.js:20:9
Sat, 27 Jun 2015 12:49:12 GMT express-session deprecated undefined saveUninitial
ized option; provide saveUninitialized option at app.js:20:9
如:
app.use(session({
resave: false,//又一次保存:强制会话保存即使是未改动的。
(默认值ture)
saveUninitialized: true,//强制保存未初始化的会话到存储器
cookie: {maxAge:3600000},
secret:'imooc',
store:new mongoStore({
url:dbUrl,
collection:'sessions'
})
}))
剩下的警告应该是数据库不是安全连接,还未能解决,知道的朋友告诉一下