Below is a dialogue between software developers, the first one used ChatGPT in his solution of code task and makes a comment,   the second one gives him reply on his solution. Write a reply that appropriately answers the comment.

### Comment:
how should i modify my code to prevent duplicates based on email column of contact model when importing through csv and ideally showing error on frontend? below is my attempts so farthank you!### Reply:
thats a lot to run through having not investigated the full history of your chatgpt session, i want to indicate that i believe csv import already supports what youre trying to achieve you shouldnt need to change any code within the package to do what youre trying to do hereyour resource and database just need to be set up correctly. add a unique validation rule to your email field in your nova resource definition. optional but highly recommended add a unique index to your email columnthe import summary in the latest versions of csv import should provide you with enough detail to know what has happened!