/// <summary>
/// Transforms a business logic layer <see cref="ValidationErrorsDictionary"/> to the web controller's <see cref="ModelStateDictionary"/>
/// </summary>
public static ModelStateDictionary ToModelState(ValidationErrorsDictionary validationErrors)
{
var result = new ModelStateDictionary();
foreach (var(key, errors) in validationErrors.AllErrors)
{
foreach (var error in errors)
{
result.AddModelError(key, error);
}
}
return(result);
}
/// <summary>
/// If some 2 or more entities have the same Id that isn't 0, an appropriate error is added to the <see cref="ValidationErrorsDictionary"/>
/// </summary>
public static void ValidateUniqueIds <TEntity>(List <TEntity> entities, ValidationErrorsDictionary modelState, IStringLocalizer localizer) where TEntity : EntityWithKey
{
if (entities is null)
{
throw new ArgumentNullException(nameof(entities));
}
if (modelState is null)
{
throw new ArgumentNullException(nameof(modelState));
}
if (localizer is null)
{
throw new ArgumentNullException(nameof(localizer));
}
// Check that Ids are unique
var duplicateIds = entities.Where(e => !(e.GetId()?.Equals(0) ?? true)) // takes away the nulls too
.GroupBy(e => e.GetId())
.Where(g => g.Count() > 1);
if (duplicateIds.Any())
{
// Hash the entities' indices for performance
Dictionary <TEntity, int> indices = entities.ToIndexDictionary();
foreach (var groupWithDuplicateIds in duplicateIds)
{
foreach (var entity in groupWithDuplicateIds)
{
// This error indicates a bug
var index = indices[entity];
modelState.AddModelError($"[{index}].Id", localizer["Error_TheEntityWithId0IsSpecifiedMoreThanOnce", entity.GetId()]);
}
}
}
}