Amazon web services - "Parameter validation failed: Invalid type for parameter" on update item in DynamoDB to a different type

jprusakova
August 11, 2023
164 views
0 votes
2 Answers

I need to update values in DynamoDB, original value is a string, new value is a number.
The error returned

Parameter validation failed: Invalid type for parameter
ExpressionAttributeValues.:ttl.N, value: 1696989709, type: <class
‘int’>, valid types: <class ‘str’>

Command:

aws dynamodb update-item 
--table-name my-datastore 
--key '{"Id": {"N": "456"}}'  
--update-expression "SET expire_at = :ttl" 
--condition-expression "attribute_type(expire_at, :date_str)" 
--expression-attribute-values '{":ttl": {"N": 1696989709}, ":date_str": {"S": "S"}}'

The column ‘expire_at’ is specified on DynamoDB as TTL

   TimeToLiveSpecification:
     AttributeName: expire_at
     Enabled: true

Is there a way to update a string value to a number value?

Answers

- hunterhacker
- August 11, 2023 at 5:46 am
- 0 votes
0
You need to put quotes around your number value, same as you did for the key value. Numbers are passed in as strings.

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- LeeHannigan
- August 11, 2023 at 11:16 am
- 0 votes
0
As Jason stated, change the TTL value in expressionAttributeValues:
```
aws dynamodb update-item 
--table-name my-datastore 
--key '{"Id": {"N": "456"}}'  
--update-expression "SET expire_at = :ttl" 
--condition-expression "attribute_type(expire_at, :date_str)" 
--expression-attribute-values '{":ttl": {"N": "1696989709"}, ":date_str": {"S": "S"}}'
```
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