Query DynamoDB between certain dates -NodeJs - node.js

Question

I'm trying to query Dynamo DB for person_id between two dates. I have errors with the following code:
Please note that the primary key of the table is (event_id), but I'm not sure how/where to use it?
var params = {
TableName: "tableName",
IndexName: "person_id-event_date-index",
FilterExpression: "#person_id =:person_id",
KeyConditionExpression: "#person_id = :person_id and #event_date BETWEEN :from AND :to",
ExpressionAttributeNames: {
"#person_id": "person_id",
"#event_date": "event_date"
},
ExpressionAttributeValues: {
":person_id": person_id,
":from": start_date,
":to": end_date
}
}
documentClient.query(params, function(err, data) {
if (err) {
console.error("Unable to query. Error:", JSON.stringify(err, null, 2));
callback(new Error(JSON.stringify(err)))
}
else {
callback(null, data);
}
});
Can anyone please check how to make this working?
Many thanks

Answer 1

Short answer, you cannot do that unless the Table has some GSI (Global Secondary Indexes) set up that allow for that sort of query.
When doing a query you must pass a primary key value, you cannot do a query otherwise.
Considering that you want to query based on a different column, not the primary key, you need to see if you have an index defined with
PrimaryKey = person_id and
RangeKey = event_date
If such an index is note defined you may rely on scan, but that's not recommended.

Answer 2

Here is the fix code:
var params = {
TableName: "tableName" ,
IndexName: "person_id-event_date-index",
KeyConditionExpression: "#person_id = :person_id and #event_date BETWEEN :from AND :to",
ExpressionAttributeNames: {
"#person_id": "person_id",
"#event_date": "event_date"
},
ExpressionAttributeValues: {
":person_id": person_id,
":from": start_date,
":to": end_date
}
}
documentClient.query(params, function(err, data) {
if (err) {
console.error("Unable to query. Error:", JSON.stringify(err, null, 2));
callback(new Error(JSON.stringify(err)))
}
else {
callback(null, data);
}
});
}