implement [Compare("password")] attribute in MVC

Question

I am trying to use the Compare attribute in MVC 4 to ensure user enters the same password twice during registration. I am using Code First approach. My sample model is as follows.

public class Registration
{
    public int RegistrationId { get; set; }
    [Required]
    [StringLength(16, MinimumLength = 6)]
    [Display(Name = "Username")]
    [Remote("CheckUserName", "Home", ErrorMessage="Username is taken.")]
    public string UserName { get; set; }
    [Required]
    [StringLength(100)]
    [DataType(DataType.Password)]
    public string Password { get; set; }
    [Compare("Password")]
    public string PasswordConfirm { get; set; }
}

The only problem with this is that the database table that gets generated would contain two password fields. Is there a smart way to avoid this problem?

Brad Christie · Accepted Answer · 2013-05-06 20:56:22Z

4

Assuming you're using entity-framework (you mentioned code-first but didn't tag it), you can decorate the property with [NotMapped] to tell the designer not to add the column.

However, it's a better idea to use separate models for the database and the view, then map the two for presentation or updating.

answered May 6, 2013 at 20:56

Brad Christie

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m4chine · Accepted Answer · 2014-10-16 20:19:03Z

The proper approach would be to use View Models instead of using your entity objects as View Models. You should never bind an entity model to a View. Just saying...

public class RegistrationViewModel
{
    public int RegistrationId { get; set; }
    [Required]
    [StringLength(16, MinimumLength = 6)]
    [Display(Name = "Username")]
    [Remote("CheckUserName", "Home", ErrorMessage="Username is taken.")]
    public string UserName { get; set; }
    [Required]
    [StringLength(100)]
    [DataType(DataType.Password)]
    public string Password { get; set; }
    [Compare("Password")]
    public string PasswordConfirm { get; set; }
}

public class Registration
{
    public int RegistrationId { get; set; }        
    public string UserName { get; set; }
    public string Password { get; set; }
}

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