CODEWITHSUNDEEP
amazon-dynamodbaws-clidynamodb-queries
Korhan Ozturk
Korhan Ozturk

Reputation: 11320

Dynamo DB Scan Field with value keyword

I'm trying to scan a dynamo db table based on a value of a list item that has value in it's name. The field is

"TPMS.value": {
    "L": [
      {
        "N": "0"
      },
      {
        "N": "0"
      },
      {
        "N": "0"
      },
      {
        "N": "0"
      }
    ]
  }

and I'd like to get results where TPMS.value[0] != 0 I've tried

aws dynamodb scan \
    --table-name afdcm-app-demo-Telemetry-Int_Table \
    --filter-expression "TPMS.value[0] > :val"  \
    --expression-attribute-values '{":val":{"N":"0"}}'

but I keep getting Invalid FilterExpression: Attribute name is a reserved keyword; reserved keyword: value. Is there a way to run the scan where field name contains value?

Upvotes: 0

Views: 865

Answers (1)

OARP
OARP

Reputation: 4077

You must use the --expression-attribute-names option. According to documentation (https://docs.aws.amazon.com/cli/latest/reference/dynamodb/scan.html):

One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames :

  • To access an attribute whose name conflicts with a DynamoDB reserved word.

  • To create a placeholder for repeating occurrences of an attribute name in an expression.

  • To prevent special characters in an attribute name from being misinterpreted in an expression.

So in your case the command should be similar to this:

aws dynamodb scan --table-name afdcm-app-demo-Telemetry-Int_Table --filter-expression "#VAL[0] > :val" --expression-attribute-names '{"#VAL":"TPMS.value"}' --expression-attribute-values '{":val":{"N":"0"}}'

Upvotes: 1

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