我有一个像这样的DynamoDB表定义：

import PySimpleGUI as sg
# All the stuff inside your window.
layout [
         [sg.Image(data=image1,key='__IMAGE__',size=(5,6))]
       ]

# Create the Window
window = sg.Window('Window Title',layout)

# Event Loop to process "events" and get the "values" of the inputs
while True:
    event,values = window.read()
    if event in (None,'Cancel'):   # if user closes window or clicks cancel
        break

    window.Element('_IMAGE_').Update(data=image2)

window.close()

其中“ pk”是分区密钥。而“ sk”是排序键。如果您想知道为什么pk和sk都具有相同的值：Adjacency List Design Pattern。

我已在“索引”属性上创建了全局二级索引。它的投影都是pk和sk键。

现在，following the documentation我正在这样查询我的GSI：

{
"pk": {
  "S": "00000000-0000-0000-0000-000000000001"
},"sk": {
  "S": "00000000-0000-0000-0000-000000000001"
},"year": {
  "N": "2019"
}
"index": {
  "N": "987654321"
}
}

我收到以下错误消息：'MissingRequiredParameter：在参数中缺少必需的键\'Key \'\ n

以防万一，我在Lambda中使用Node.js 8.10