DynamoDB Dynomite Querying Consistent Read
Important: These docs are for the outdated Jets 5 versions and below. For the latest Jets docs: docs.rubyonjets.com
Consistent Read
You can enable consistent_read, but note consistent reads are not supported by GSI indexes. So a scan will be performed instead even if an index is found.
# There's a GSI index for category. GSI do not support consistent read. So it'll fallback to scan
Product.where(category: "Electronics").consistent_read
DynamoDB only supports consistent_read with primary keys. So, if you want to ensure you do not scan and perform a query, provide the entire primary key. Example:
# The full primary key is provided so that a query can take place
Product.where(category: "Electronics", sku: 100).consistent_read
Force Scan
If you need to force a scan operation, you can use force_scan.
Product.where(category: "Electronics").force_scan # will scan even though there's an index on category