Common Laravel admin panel bug: form validation rejects unchanged email.

A common error in admin panel forms occurs when a user record update fails because the validation incorrectly flags the unchanged email as already taken. The solution involves using Laravel's 'sometimes' rule to validate only fields present in the request, avoiding the accidental wiping of unsent data. Crucially, the 'unique' validation rule must include an 'ignore' clause to exempt the current record being edited from the duplicate check. Proper implementation of these rules ensures safe partial updates, distinguishing between the strict validation needed for creating records and the more flexible validation for updates.