What would be the best way to validate the uniqueness of a model? For example, making sure that only one user can have a certain username.
I am using the repository pattern to interact with the database, so should I place the check int there? If so, how do I get this to filter back to the model?
Thanks
Are you also enforcing this constraint in the database?
Add a method to your UserRepository to lookup if the UserName is in use. The UserRepository could perform this validation on User.Save
public class UserRepository {
private bool IsUserNameInUse(string userName) {
return false;
}
private bool IsUserNameInUse(int userId, string userName) {
// Verify no record other than the userid submitted is using the username
return false;
}
public void Save(User userToSave) {
if (IsUserNameInUse(userToSave.UserName)) throw new Exception();
}
}
