Have you tried adding a ->unique() flag to the userId field in your Project migration, so the Exception can be handled when it tries to insert a new record, and there is already one present?
relationship defined in the model alone does not actually handle this behavior. you can either check if a project exist before to creating one or add an index as @joshuaajones suggested, which will throw a mysql exception when trying to insert.
Dude you forgot the main part the best method is validation. Validate it using Request and use exists rule to achieve this.
Thanks
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