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POEntity Framework Code First update error with unloaded required navigation property
 

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  1. POEntity Framework Code First update error with unloaded required navigation property
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    <p>I found out that, if i set a navigation property as required ( using the Required attribute ) and use lazy-loading proxies, when i load the parent entity and do nothing but try to save in the same context, an EntityValidationError occurs which is like "xxx field is required". </p> <p>With hibernate in Java and NHibernate in .NET, it is possible to just fetch an entity without its navigation properties ( all lazy loaded ) , update it and save again. The framework realizes that nothing changed with the navigation references and do not throw any errors. </p> <p>The example is below</p> <pre><code>[Table("Address")] public class Address { [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int AddressId { get; set; } [Required, StringLength(512)] public virtual string AddressLine1 { get; set; } } [Table("User")] public class User { [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int UserId { get; set; } [Required] public string Name {get; set;} [Required] public virtual Address Address {get; set;} } void LoadAndSaveUser() { var user = Context.Users.First(); user.Name = "foo"; // if i comment out this line // ( probably EF fetches the lazy loaded entiy ) // the code works. it is strange though because i don't access any property/method of the Address // var dummy = user.Address Context.SaveChanges(); } </code></pre> <p>When i try this without the "Required" attribute on the Address property, no error occurs. With the Required attribute, i get "Address field is required!". Since each user should have an address, i want the attribute to create a consistent model.</p> <p>In some forums, i found posts suggesting to include the navigation property while loading the parent entity ( eager load in other words ) but it is not a feasible approach if we have too many navigation properties. </p> <p>Am i doing something wrong or is there any other way to implement such funcionality ?</p>
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    1. USCagatay Kalan
    1. USCagatay Kalan
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    1. COpossible duplicate of [EF: Validation failing on update when using lazy-loaded, required properties](http://stackoverflow.com/questions/6038541/ef-validation-failing-on-update-when-using-lazy-loaded-required-properties)
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      1. POEntity Framework Code First update error with unloaded required navigation property
      1. USDiego Mijelshon
 

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