Can I create azure cosmos db document with a custom key other than Id

Question

I am using azure cosmos db for saving and editing my session information. Currently i am not using ID in my document, instead i have another unique field with all docs. How can i update my query to get documents?

Answer 1

You can use whatever property you want, for your custom key (just make sure you don't remove its index). By default, all properties are indexed unless you explicitly set up a custom index policy that removes certain properties from being indexed.

You cannot eliminate the built-in id property though; if you don't set it explicitly, it will just be set to a guid.

If you are doing queries, this really shouldn't matter, functionality-wise. Just search on whatever properties you want. However: If you are doing point-reads (a read is more efficient, RU-wise, than a query, when retrieving a single document) you can only perform a point-read by specifying the id property, not your custom property. If you must use a custom property and you need to do point-reads, you can consider storing your custom property as id as well (as long as it's guaranteed to be unique per document).