Mongo查询以查找属性不是空字符串的所有记录

Question

Trying to find all records where attribute is not an empty string.

db.player.find({name: {$not: ''}})

gives the error:

error: {
    "$err" : "Can't canonicalize query: BadValue $not needs a regex or a document",
    "code" : 17287
}

Do i have to use a regex to do this or is there a simpler way to check for empty strings using mongo?

Answer 1

为此使用$ne ：

db.player.find({name: {$ne: ''}})