如何检查 dynamodb 中的字符串集中是否存在字符串

我在表中的每个项目中都设置了一个字符串。例如，

{                                        
   Title = "Book 101 Title"
   ISBN = "111-1111111111"
   Authors = "Author 1"
   Price = -2
   Dimensions = "8.5 x 11.0 x 0.5"
   PageCount = 500
   Color = [ "Red", "Black" ]
   ProductCategory = "Book" 
}


{                                        
   Title = "Book 102 Title"
   ISBN = "222-222222222"
   Authors = "Author 2"
   Price = -8
   Dimensions = "8.5 x 11.0 x 0.5"
   PageCount = 700
   Color = [ "Red", "Green" ]
   ProductCategory = "Book" 
}

使用 dynamoDB php sdk，我想获取“红色”颜色的项目。我尝试这样。

$response = $client->query(array(
    "TableName" => $tablename,
    "KeyConditions" => array(
        "ComparisonOperator" => ComparisonOperator::CONTAINS,
        'Color' => array(
            'AttributeValueList' => array(
                array(Type::STRING_SET => array("Red"))
        ),
     )
));

但我遇到了这样的错误。

ValidationException: One or more parameter values were invalid: ComparisonOperator CONTAINS is not valid for SS AttributeValue type

我从aws开发者论坛找到了解决方案here https://forums.aws.amazon.com/thread.jspa?messageID=351861#jive-message-351861。无法使用CONTAINS with query。必须与它一起使用scan。像那样。

$response = $client->scan(array(
    "TableName" => $tablename,
    "KeyConditions" => array(
        "ComparisonOperator" => ComparisonOperator::CONTAINS,
        'Color' => array(
            'AttributeValueList' => array(
                array(Type::STRING => "Red")
        ),
     )
));