How to update DynamoDB item by searching on GSI primary key?

Question

Table has these columns on DynamoDB:

• primaryKey
• sortKey
• GSI_primaryKey
• data

And there is GSI added with primary key GSI_primaryKey and sort key on primaryKey

How to update column data if I have only the value of the GSI_primaryKey?

With NodeJS document client.

Thanks :)

Answer 1

What I found out is I need to get the item by GSI and then using primaryKey and sortKey update the item and cannot update item using GSI only.