title: FluentValidation Child Validator Message Not Showing
body: <p>I have the following child validator with two constructors one with no parameter and the other passing parent object as parameter:</p>
  
  <pre><code>public class ChildValidator : AbstractValidator&lt;Child&gt;
  {
      public ChildValidator()
      {
          RuleFor(x =&gt; x.LastName)
              .NotEmpty()
              .WithMessage("Last Name is required");
      }
  
      public ChildValidator(Parent parent)
      {
          RuleFor(x =&gt; x.LastName)
              .Equal(x =&gt; parent.LastName)
              .WithMessage("Parent and child Last Name must be equal");
      }
  }
  </code></pre>
  
  <p>Parent validator:</p>
  
  <pre><code>public class ParentValidator : AbstractValidator&lt;Parent&gt;
  {
      public ParentValidator()
      {
          RuleFor(x =&gt; x.LastName)
              .NotEmpty()
              .WithMessage("Last Name is required");
  
          RuleFor(x =&gt; x.Children)
              .SetCollectionValidator(parent =&gt; new ChildValidator(parent));
      }
  }
  </code></pre>
  
  <p>Models:</p>
  
  <pre><code>[FluentValidation.Attributes.Validator(typeof(ParentValidator))]
  public class Parent
  {
      public string LastName { get; set; }
  
      public virtual ICollection&lt;Child&gt; Children { get; set; }
  }
  
  [FluentValidation.Attributes.Validator(typeof(ChildValidator))]
  public class Child
  {
      public string LastName { get; set; }
  
      public int ParentId { get; set; }
      public virtual Parent Parent { get; set; }
  }
  </code></pre>
  
  <p>In Child partial view:</p>
  
  <pre><code>@using (Html.BeginCollectionItem("Children"))
  {
      @Html.HiddenFor(model =&gt; model.Id)
      @Html.HiddenFor(model =&gt; model.ParentId)
  
      @Html.EditorFor(model =&gt; model.LastName)
      @Html.ValidationMessageFor(model =&gt; model.LastName)
  </code></pre>
  
  <p>The validation works fine. However, while the message for the validator with no parameter is showing, the message for validator with parameter is not.</p>