Monthly Archives: 2016年7月

Cannot read property pm2_env of undefined

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[PM2][WARN] Applications x-filter not running, starting...
/usr/local/lib/node_modules/pm2/lib/CLI.js:461
        Common.printOut(cst.PREFIX_MSG + 'App [%s] launched (%d instances)', data[0].pm2_env.name, data.length);
                                                                                    ^

TypeError: Cannot read property 'pm2_env' of undefined
    at /usr/local/lib/node_modules/pm2/lib/CLI.js:461:85
    at /usr/local/lib/node_modules/pm2/node_modules/pm2-axon-rpc/lib/client.js:45:10
    at Parser.<anonymous> (/usr/local/lib/node_modules/pm2/node_modules/pm2-axon/lib/sockets/req.js:67:8)
    at emitOne (events.js:96:13)
    at Parser.emit (events.js:188:7)
    at Parser._write (/usr/local/lib/node_modules/pm2/node_modules/amp/lib/stream.js:91:16)
    at doWrite (_stream_writable.js:307:12)
    at writeOrBuffer (_stream_writable.js:293:5)
    at Parser.Writable.write (_stream_writable.js:220:11)
    at Socket.ondata (_stream_readable.js:555:20)

碰到这个心情不好，最后发现。其实只要跑一下 pm2 update 就好了。大致是因为更新了 pm2 没有跑这个命令出来的问题。

mongodb 通过数组某一元素查询

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> db.test.insert({ arr: [ 1, 2, 3, 4, 5] })
WriteResult({ "nInserted" : 1 })

> db.test.insert({ arr: [ 5, 6, 7, 8, 9 ] })
WriteResult({ "nInserted" : 1 })

> db.test.find({ arr : { $in : [ 3 ] } })
{ "_id" : ObjectId("5779d5b99f113cca8e7002c1"), "arr" : [ 1, 2, 3, 4, 5 ] }

> db.test.find({ arr : { $in : [ 5 ] } })
{ "_id" : ObjectId("5779d5b99f113cca8e7002c1"), "arr" : [ 1, 2, 3, 4, 5 ] }
{ "_id" : ObjectId("5779d6879f113cca8e7002c2"), "arr" : [ 5, 6, 7, 8, 9 ] }

> db.test.find({ arr : { $in : [ 3, 4, 5 ] } })
{ "_id" : ObjectId("5779d5b99f113cca8e7002c1"), "arr" : [ 1, 2, 3, 4, 5 ] }
{ "_id" : ObjectId("5779d6879f113cca8e7002c2"), "arr" : [ 5, 6, 7, 8, 9 ] }

> db.test.find({ arr: 5 })
{ "_id" : ObjectId("5779d5b99f113cca8e7002c1"), "arr" : [ 1, 2, 3, 4, 5 ] }
{ "_id" : ObjectId("5779d6879f113cca8e7002c2"), "arr" : [ 5, 6, 7, 8, 9 ] }