How to use GSI in dynamodb? - amazon-web-services

Question

I am using AWS Console and NodeJS.
I have the dynamodb table of users with partition key (user_id) and sort key (company_id) and other attributes.
One of my attributes is email of user. Email is unique attribute.
I need to get user_id by email but I haven't his user_id and company_id.
I think that I should use a Global Secondary Index.
I clicked on the users table, opened the Indexes tab and created GSI for this table. (name: email, type: GSI, Partition Key: email string, attributes: user_id)
I am using method Query from documentClient. This is my payload:
payload = {
"TableName": "users",
"IndexName": "email",
"KeyConditionExpression": "#index = :index_value",
"ExpressionAttributeNames":{
"#index": "email"
},
"ExpressionAttributeValues": {
":index_value": {"S": "test#gmail.com"}
},
"ProjectionExpression": "user_id",
"ScanIndexForward": false
};
}
This is my error from CloudWatch:
"errorMessage": "One or more parameter values were invalid: Condition parameter type does not match schema type"

Answer 1

I have found a solution while I was writing this question.
So as I use documentClient my payload should looks like this
payload = {
"TableName": "users",
"IndexName": "email",
"KeyConditionExpression": "#index = :index_value",
"ExpressionAttributeNames":{
"#index": "email"
},
"ExpressionAttributeValues": {
":index_value": "test#gmail.com" // <----------------
},
"ProjectionExpression": "user_id",
"ScanIndexForward": false
};
}
Hope it helps to someone