使用Mongoose中间件从MongoDB查找查询文档

Question

我正在使用猫鼬中间件连接到mongodb。

我有MongoDB集合：

{ "_id" : ObjectId("54801a4def32fe8c2bc642a6"), "name" : "Cyber KOK", "serial" : null } 
{ "_id" : ObjectId("54801a4def32fe8c2bc642a5"), "name" : "Cyber KOK", "serial" : "" } 
{ "_id" : ObjectId("54801a4def32fe8c2bc642a7"), "name" : "Cyber KOK", "serial" : " " } 
{ "_id" : ObjectId("54801a4def32fe8c2bc642a8"), "name" : "Cyber KOK", "serial" : "14A16" } 
{ "_id" : ObjectId("54801a4def32fe8c2bc642a9"), "name" : "Cyber KOK", "serial" : "19B20" }

如何使用mongoose查询mongodb集合以在一个命令中显示如下？

{ "_id" : ObjectId("54801a4def32fe8c2bc642a6"), "name" : "Cyber KOK", "serial" : null }
{ "_id" : ObjectId("54801a4def32fe8c2bc642a5"), "name" : "Cyber KOK", "serial" : "" }
{ "_id" : ObjectId("54801a4def32fe8c2bc642a7"), "name" : "Cyber KOK", "serial" : " " }

谢谢。 WJ。

Answer 1

尝试类似

Model.find({$or : [{serial: ""}, {serial: " "}, {serial: null}]}, function(){...});