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What is the best way to prevent customers from evaluating a product more than once?

How to prevent a customer from evaluating a product more than once? Is it best to use cookies that store an IP address, or is it better to store user ratings in a database? I am using MySQL and ColdFusion.

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3 answers

If you have user accounts, compare your ratings with your accounts. The work is done as long as one user has only one account.

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 IF userVoted != true 
         saveVote ( "ipAddress", "User Voted Yes")
    else
         display ( "You have already voted" )
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Source: https://habr.com/ru/post/1734077/

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