public async Task <OperationResult> ValidateAsync(IShopManager manager, Category entity)
{
if (manager == null)
{
throw new ArgumentNullException(nameof(manager));
}
if (entity == null)
{
throw new ArgumentNullException(nameof(entity));
}
var errors = new List <OperationError>();
if (entity.Id < 0 || entity.Id == entity.ParentId)
{
errors.Add(manager.ErrorDescriber.InvalidModel());
}
if (entity.Name.IsNullOrEmpty())
{
errors.Add(manager.ErrorDescriber.EmptyCategoryName());
}
else
{
Category existing = await manager.GetCategoryByNameAsync(entity.Name);
if (existing != null & existing?.Id != entity.Id)
{
errors.Add(manager.ErrorDescriber.DuplicateCategoryName());
}
}
if (errors.Count > 0)
{
return(OperationResult.Failure(errors.ToArray()));
}
return(OperationResult.Success());
}
