Fetching data by composite primary key in dynamodb - amazon-dynamodb

Question

I am using following function ->
const params = {
TableName: process.env.dummyTable,
Key: {
outlet_id:event.pathParametrs.id,
id:{"S":"default"}
}
}
dynamoDb.get(params).promise()
.then(result => {
console.log('-->',result);
const response = {
statusCode: 200,
body: JSON.stringify(result),
};
callback(null, response);
})
.catch(error => {
console.error(error);
callback(new Error('Couldn\'t fetch table Data'));
return;
});
}
I want to fetch records based on outlet_id and id.Here outlet_id is primary partition key while id is primary sort key(with uuid).
How to specify id(primary sort key) with default value so that I can fetch data

Answer 1

It's unclear whether you are trying to fetch a single item by specifying a composite partition+sort key, or trying to query all items with the same partition key (ie. without specifying a sort key).
If you were trying to get a single item, with a particular partition key and sort key, your code looks good with one exception. The partition key should be specified with the type as well, like so:
const params = {
TableName: process.env.dummyTable,
Key: {
outlet_id:{"S": event.pathParametrs.id},
id:{"S":"default"}
}
}
However, if you are trying to query for all items with the same partition key (ie. without specifying a sort key) then you would need to modify the code to do a query rather than a get:
const params = {
TableName: process.env.dummyTable,
Key: {
outlet_id: {"S": event.pathParametrs.id}
}
}
dynamoDb.query(params).promise()
.then(
//...
)
.catch(
//...
)