Query DynamoDB with Two Matching Fileds - mongodb

Question

I am new into DynamoDB. I am trying to query a collection with two matching field. I have written a code in mongoDB, I am trying to migrate to DocumentDB. I am facing issue.
MongoDB Code
This works well
getUser= async(req,res)=>{
let user = await user.findOne({phone:[phone], otp:2345});
}
DynamoDB Code
getUser= async(req,res)=>{
const params = {
KeyConditionExpression: 'phone = :phone and #otp = :otp',
ExpressionAttributeValues: {
':phone': 919600923917,
":otp":2387
},
TableName: "users",
};
const user= await documentClient.query(params).promise();
}
Issue: Invalid KeyConditionExpression: An expression attribute name
used in the document path is not defined; attribute name: #otp

Answer 1

As your error is shown
Issue: Invalid KeyConditionExpression: An expression attribute name
used in the document path is not defined; attribute name: #otp
It simply means you add #otp = :otp in KeyConditionExpression, it should be not there in KeyConditionExpression. otp = :otp do something like in KeyConditionExpression.
Updated Answer:
As mentioned, the attribute included in "KeyConditionExpression" should be your hash key only, matching your base table schema (in this case 'phone' maybe). If you want to query on both 'phone' and 'otp', you need to create the table with hash and range key and specify 'otp' as your range key.
Global secondary indexes are completely separate from the base table, so in this case you can query the indexes separately (use 'otp' in key condition when querying OtpIndex).
Sample Code:
var params = {
TableName: 'users',
IndexName: "OtpIndex",
KeyConditionExpression: "phone = :phone and otp = :otp",
ExpressionAttributeValues: {
':phone': 919600923917,
':otp': 2387
},
};
Please find more details on querying global secondary indexes Doc

Answer 2

You can use Two matching field. to do this you need to define 2 keys
Partition Key
Sort Key
Mark one field as Partition key and another as Sort Key
Example- Partition Key - phone
Sort Key - otp.
if you have already made other attribute as key and not able to make otp/phone as key then you can create Secondary index and mark phone and otp as key into that.
you can mark different attributes (columns) as partition key or sort key other than already mentioned primary key or sort key in base table ( Main table).
also you can use --filter-expression
something like this
aws dynamodb query \
--table-name users \
--key-condition-expression "phone = :phone \
--filter-expression "#otp = :otp" \
--expression-attribute-names '{"#otp": "otp"}' \
--expression-attribute-values file://values.json