json in an 'any' field faillng

[ktwbc]

I have an audit log which contains an id column, an event string and a third metadata column which could be any json object.

The field is defined as 'any' in the electro model since it could be any, but setting that field to my object fails.

electro:

attributes: {
      messageId: { type: 'string' },
      createdAt: { type: 'number', field: 'created_at' },
      toExpire: { type: 'number', field: 'to_expire' },
      event: { type: 'string' },
      data: { type: 'any' }
    },

code:

    let emailSent = {
        messageId: response.MessageId,
        event: data.letter,
        data: data,
        toExpire: DateTime.now().plus({ months: 3 }).toUnixInteger()
      }
      await DynamoEmailSent.put(emailSent).go();

error:

  "errorMessage": "ElectroError: Error thrown by DynamoDB client: \"Unsupported type passed: [object Object]. Pass options.convertClassInstanceToMap=true to marshall typeof object as map attribute.\" - For more detail on this error reference: https://electrodb.dev/en/reference/errors/#aws-error"

[ktwbc]

turned out my json was a full object with attached methods instead of just pure data