MongoDB dup key: { : null }

Question

我没有太多 MongoDB 经验，并且我在使用 mLab 实例时遇到以下问题：

E11000 duplicate key error index: development.users.$key_1 dup key: { : null } MongoError: E11000 duplicate key error index: development.users.$key_1 dup key: { : null }

我尝试按key字段排序，寻找null密钥，但不确定应该如何查找重复的null密钥。让这件事变得困难的是，我什至不知道要搜索谷歌或堆栈溢出来解决这个问题。任何帮助将不胜感激，以下是完整的错误：

Mongoose model 'index-single-done' event fired on 'Family' for index:
Object {key: 1}

With error:
    E11000 duplicate key error index: development.users.$key_1 dup key: { : null } MongoError: E11000 duplicate key error index: 
development.users.$key_1 dup key: { : null }
at Function.MongoError.create (/Users/myUserName/development/projectName/node_modules/mongodb-core/lib/error.js:31:11)
at /Users/myUserName/development/projectName/node_modules/mongodb-core/lib/connection/pool.js:497:72
at authenticateStragglers (/Users/myUserName/development/projectName/node_modules/mongodb-core/lib/connection/pool.js:443:16)
at Connection.messageHandler (/Users/myUserName/development/projectName/node_modules/mongodb-core/lib/connection/pool.js:477:5)
at Socket.<anonymous> (/Users/myUserName/development/projectName/node_modules/mongodb-core/lib/connection/connection.js:333:22)
at Socket.emit (events.js:180:13)
at Socket.emit (domain.js:422:20)
at addChunk (_stream_readable.js:274:12)
at readableAddChunk (_stream_readable.js:261:11)
at Socket.Readable.push (_stream_readable.js:218:10)
at TCP.onread (net.js:581:20)
Mongoose model 'index' event fired on 'Family' with error:
E11000 duplicate key error index: development.users.$key_1 dup key: { : null } MongoError: E11000 duplicate key error index: development.users.$key_1 dup key: { : null }
at Function.MongoError.create (/Users/myUserName/development/projectName/node_modules/mongodb-core/lib/error.js:31:11)
at /Users/myUserName/development/projectName/node_modules/mongodb-core/lib/connection/pool.js:497:72
at authenticateStragglers (/Users/myUserName/development/projectName/node_modules/mongodb-core/lib/connection/pool.js:443:16)
at Connection.messageHandler (/Users/myUserName/development/projectName/node_modules/mongodb-core/lib/connection/pool.js:477:5)
at Socket.<anonymous> (/Users/myUserName/development/projectName/node_modules/mongodb-core/lib/connection/connection.js:333:22)
at Socket.emit (events.js:180:13)
at Socket.emit (domain.js:422:20)
at addChunk (_stream_readable.js:274:12)
at readableAddChunk (_stream_readable.js:261:11)
at Socket.Readable.push (_stream_readable.js:218:10)
at TCP.onread (net.js:581:20)

Answer 1

duplicate key error index: development.users.$key_1 dup key: { : null }

这意味着您的key字段设置为仅接受唯一值，并且已经有一条key具有值的记录，并且您无法使用asnull插入另一文档。它类似于 SQL 数据库中的主键。keynull

检查您的猫鼬模式，因为它看起来像您正在使用猫鼬。

最有可能的：

1. 保存记录时您没有传递密钥
2. 如果您传递密钥，则其值为空