I am using Java in Google App Engine.
The scenario is that users can upvote and downvote an Article object. Users can upvote only once per article. What is the best implementation on this?
Thanks
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I am using Java in Google App Engine.
The scenario is that users can upvote and downvote an Article object. Users can upvote only once per article. What is the best implementation on this?
Thanks
Create a Vote entity that its key is the user id and the article id. This way you can get the user vote without a query and you don’t need a transaction to create a user vote.