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POValidation of nested models in view model in ASP.Net MVC
 

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  1. POValidation of nested models in view model in ASP.Net MVC
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    <p>I have an application with a Company model. The Company model has a navigation property to an Address model (one-to-one relationship):</p> <p><strong>Company.cs</strong></p> <pre><code>public class Company { public int CompanyID { get; set; } public string Name { get; set; } // Snip... public virtual Address Address { get; set; } } </code></pre> <p>I've created a view model to handle the edit, detail, and create actions:</p> <p><strong>CompanyViewModel.cs</strong></p> <pre><code>public class CompanyViewModel { public int CompanyID { get; set; } [Required] [StringLength(75, ErrorMessage = "Company Name cannot exceed 75 characters")] public string Name { get; set; } // Snip... public Address Address { get; set; } } </code></pre> <p>I'm using AutoMapper in my controller to map back and forth between the model and view model, and everything is working properly. However, I now want to use validation on the address object - I do not want a company to be created without an address being present.</p> <p>My first thought was the simple route - I tried putting a '[Required]' annotation on the Address property. This didn't do anything.</p> <p>I then thought it would be better to do away with the Address property and abstract that data in the view model, so I added properties to the view model for all the properties in my Address class:</p> <pre><code>public string Address1 { get; set; } public string Address2 { get; set; } public string City { get; set; } public string PostalCode { get; set; } // etc.... </code></pre> <p>This seemed like good practice, but now my AutoMapper can't map these properties to the Company class' Address object, so I had to manually map in the controller:</p> <pre><code>public ActionResult Details(int id = 0) { // Snip code retrieving company from DB CompanyViewModel viewModel = new CompanyViewModel(); viewModel.Name = company.Name; viewModel.Address1 = company.Address.Address1; // Snip... return View(viewModel); } </code></pre> <p>This leads to a lot of extra code in my controller instead of a nice one-line AutoMapper statement...so what's the right way to deal with this (validation of nested models in a view model)?</p> <p>Is it good practice to expose the Address property directly in the view model, or better to abstract it out with separate properties like I have done?</p> <p>Can AutoMapper work in a situation where source and destination are not exact matches?</p>
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    1. COSee this question: http://stackoverflow.com/questions/3334781/asp-net-mvc-2-validate-nested-objects
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