带有NOT IN的DynamoDB FilterExpression

问题描述

我试图在DynamoDB查询（在Node.JS环境中）上运行过滤器表达式，以使其中一个属性不在这些属性的列表中。我正在这样做：

I'm trying to run a filter expression on a DynamoDB query (in a Node.JS environment), for one of the attributes not to be in a list of those attributes. I'm doing this:

documentClient.query( {
    TableName: 'event',
    IndexName: 'OrganisationTimestamp',
    KeyConditionExpression: '#ts BETWEEN :from AND :to',
    ExpressionAttributeNames: {
      '#ts': 'Timestamp'
    },
    ExpressionAttributeValues: {
        ':to': to,
        ':from': from,
        ':ignoredUserIds': "1, 2, 3"
    },
    FilterExpression: 'not (userId in (:ignoredUserIds))'
  })

但是我在这里没有任何运气，并且使用userId属性返回该范围内的项目。

However I'm not having any luck here, and getting items back with the userId attribute within that range.

任何帮助，谢谢！

推荐答案

IN -仅在将 userId 属性定义为DynamoDB <$ c $时使用c> LIST 数据类型

IN - can be used only if userId attribute is defined as DynamoDB LIST data type

AttributeValueList可以使
包含一个或多个String，Number或
Binary类型的AttributeValue元素。将这些属性与项目
的现有属性进行比较。如果输入中的任何元素等于item属性，则表达式
的计算结果为true。

AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary. These attributes are compared against an existing attribute of an item. If any elements of the input are equal to the item attribute, the expression evaluates to true.

解决方案：

如下所述更改FilterExpression和ExpressionAttributeValues。

Change the FilterExpression and ExpressionAttributeValues as mentioned below. It should work.

ExpressionAttributeValues: {
        ':to': to,
        ':from': from,
        ':userid1': "1",
        ':userid2': "2",
        ':userid3': "3"
    },
FilterExpression: 'userId <> :userid1 and userId <> :userid2 and userId <> :userid3'

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