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POHow to get ModelState key / Model property names to match?
 

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  1. POHow to get ModelState key / Model property names to match?
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    <p>I have an MVC3 application, I'm using EF4.1 Code First and POCO Classes.</p> <p>My question involves getting rid of hard-coded "PropertyNames" in my POCO Class and also pre-fixing it with the proper values in ModelState so that the validation message appear properly.</p> <p>I have in my POCO class a method that looks like this. You will notice that I am also using the "DataAnnotations.Validator" code to re-use the Data Annotations validation.</p> <pre><code>public class TaxCode : ModelBusinessObjectBase { //... [Required] [DataType(DataType.Date)] [DisplayName("Effective Date")] public DateTime EffectiveDate { get { return _effectiveDate; } set { _effectiveDate = value; } } [Required] [DataType(DataType.Date)] [DisplayName("Expiry Date")] public DateTime ExpiryDate { get { return _expiryDate; } set { _expiryDate = value; } } //... public override IEnumerable&lt;ValidationResult&gt; GetValidationResults() { //---- data annotation validation ---- ValidationContext validationContext = new ValidationContext(this, null, null); IList&lt;ValidationResult&gt; dataAnnotationValidationResults = new List&lt;ValidationResult&gt;(); bool isValid = Validator.TryValidateObject(this, validationContext, dataAnnotationValidationResults, true); foreach (ValidationResult dataAnnotationValidationResult in dataAnnotationValidationResults) yield return new ValidationResult(dataAnnotationValidationResult.ErrorMessage, dataAnnotationValidationResult.MemberNames); //---- custom business rule validation ---- // expiry date must be greater than effective date if (ExpiryDate &lt;= EffectiveDate) { yield return new ValidationResult("Expiry Date must be after Effective Date", new [] {"EffectiveDate", "ExpiryDate"}); } yield break; } </code></pre> <p>In my service layer, I will eventually call something like this:</p> <pre><code> public bool TryValidate(TaxCode domainObject) { if (!domainObject.IsValid) { _validationDictionary.AddValidationResults(domainObject.GetValidationResults()); isValid = false; } return isValid; } </code></pre> <p>And using a "ModelStateWrapper", the code does this:</p> <pre><code> public virtual void AddValidationResults(IEnumerable&lt;ValidationResult&gt; validationResults) { foreach (ValidationResult validationResult in validationResults) { _modelState.AddModelError(validationResult.MemberNames.First(), validationResult.ErrorMessage); } } </code></pre> <p>My view model is this:</p> <pre><code>public class TaxCodeViewModel : IPersistantBusinessObjectViewModel&lt;TaxCode&gt; { public TaxCodeViewModel() { } public TaxCodeViewModel(TaxCode domainObj) { this.BusinessObject = domainObj; } } </code></pre> <p>And my View looks a bit like this:</p> <pre><code> &lt;%@ Control Language="C#" AutoEventWireup="true" Inherits="System.Web.Mvc.ViewUserControl&lt;TaxCodeViewModel&gt;" %&gt; //... &lt;% using (Html.BeginForm()) {%&gt; &lt;%:Html.ValidationSummary(false, "Unable to save. Please correct the errors and try again.")%&gt; //... &lt;div class="editor-label"&gt; &lt;%:Html.LabelFor(model =&gt; model.BusinessObject.EffectiveDate)%&gt; &lt;/div&gt; &lt;div class="editor-field"&gt; &lt;%: Html.EditorFor(model =&gt; model.BusinessObject.EffectiveDate)%&gt; &lt;%: Html.ValidationMessageFor(model =&gt; model.BusinessObject.EffectiveDate)%&gt; &lt;/div&gt; &lt;br /&gt; &lt;div class="editor-label"&gt; &lt;%: Html.LabelFor(model =&gt; model.BusinessObject.ExpiryDate)%&gt; &lt;/div&gt; &lt;div class="editor-field"&gt; &lt;%: Html.EditorFor(model =&gt; model.BusinessObject.ExpiryDate)%&gt; &lt;%: Html.ValidationMessageFor(model =&gt; model.BusinessObject.ExpiryDate)%&gt; &lt;/div&gt; &lt;br /&gt; //... </code></pre> <p>My Question are: </p> <ol> <li><p>How do I avoid the hardcoded property name strings "Expiry Date"?</p></li> <li><p>Because of the ViewModel, expects the ModelState key to be "BusinessObject.ExpiryDate". How do I, get my properties to match? How do I add a prefix or remove the automatically added prefix?</p></li> <li><p>Notice I currently use validationResult.MemberNames.First()). In my case, I only want one message in the validation summary, but I would like to have BOTH properties highlighted. i.e. only one message for ".validation-summary-errors" but both fields highlighted for ".input-validation-error" and ".field-validation-error" elements in the DOM.</p></li> </ol> <p>Thank you,</p>
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