complex form type validation

backend/FwLite/MiniLcm.Tests/Validators/ComplexFormTypeValidationTests.cs

@@ -13,6 +13,12 @@ public void FailsForEmptyName()
         var complexFormType = new ComplexFormType() { Name = new MultiString() };
         _validator.TestValidate(complexFormType).ShouldHaveValidationErrorFor(c => c.Name);
     }
+    [Fact]
+    public void FailsForNameWithEmptyStringValue()
+    {
+        var complexFormType = new ComplexFormType() { Name = new(){ { "en", string.Empty } } };
+        _validator.TestValidate(complexFormType).ShouldHaveValidationErrorFor(c => c.Name);
+    }
 
     [Fact]
     public void FailsForNonNullDeletedAt()

backend/FwLite/MiniLcm/Validators/ComplexFormTypeValidator.cs

@@ -9,6 +9,6 @@ internal class ComplexFormTypeValidator : AbstractValidator<ComplexFormType>
     public ComplexFormTypeValidator()
     {
         RuleFor(c => c.DeletedAt).Null();
-        RuleFor(c => c.Name).ValidMultiString();
+        RuleFor(c => c.Name).Required();
     }
 }

backend/FwLite/MiniLcm/Validators/MultiStringValidator.cs

@@ -5,8 +5,13 @@ namespace MiniLcm.Validators;
 
 internal static class MultiStringValidator
 {
-    public static IRuleBuilderOptions<T, MultiString> ValidMultiString<T>(this IRuleBuilder<T, MultiString> ruleBuilder)
+    public static IRuleBuilderOptions<T, MultiString> Required<T>(this IRuleBuilder<T, MultiString> ruleBuilder)
     {
-        return ruleBuilder.NotEmpty();
+        return ruleBuilder.NotEmpty().NoEmptyValues();
+    }
+    public static IRuleBuilderOptions<T, MultiString> NoEmptyValues<T>(this IRuleBuilder<T, MultiString> ruleBuilder)
+    {
+        return ruleBuilder.Must(ms => ms.Values.All(v => !string.IsNullOrEmpty(v.Value))).WithMessage((parent, ms) =>
+            $"MultiString must not contain empty values, but [{string.Join(", ", ms.Values.Where(v => string.IsNullOrWhiteSpace(v.Value)).Select(v => v.Key))}] was empty");
     }
 }