public static TValidationMetadata GetValidationOrCreateNew <TValidationMetadata>([NotNull] this ModelMetadataItem item)
where TValidationMetadata : class, IModelValidationMetadata, new()
{
var validation = item.GetValidation <TValidationMetadata>();
if (validation == null)
{
validation = new TValidationMetadata();
item.Validations.Add(validation);
}
return(validation);
}
private static void SyncValidations([NotNull] ModelMetadataItem metadataFrom, [NotNull] ModelMetadataItem metadataTo)
{
if (metadataFrom.Validations.Count > 0)
{
var types = new HashSet <Type>();
foreach (var metadata in metadataTo.Validations)
{
var type = metadata.GetType();
if (!types.Contains(type))
{
types.Add(type);
}
}
//TODO: how about Deleged validation? just rewrite it completely?
foreach (var validation in metadataFrom.Validations)
{
if (!types.Contains(validation.GetType()))
{
metadataTo.Validations.Add(validation);
}
}
}
if (metadataTo.IsRequired == null && metadataFrom.IsRequired.HasValue && metadataFrom.IsRequired.Value)
{
metadataTo.IsRequired = metadataFrom.IsRequired.Value;
}
// ensure that Required attribute is removed
if (metadataFrom.IsRequired.HasValue && !metadataFrom.IsRequired.Value)
{
var requiredValidation = metadataTo.GetValidation <RequiredValidationMetadata>();
if (requiredValidation != null)
{
metadataTo.Validations.Remove(requiredValidation);
}
metadataTo.IsRequired = false;
}
}