private async Task ValidateTag(NewTagDto newTagDto)
{
if (newTagDto == null)
{
throw new ArgumentNullException(nameof(newTagDto));
}
else if (await _repository.TagExists(newTagDto.Title))
{
throw new ValidationException("Tag already exists");
}
else if (newTagDto.Title.Length < 3)
{
throw new ValidationException("Tag is too short");
}
else if (newTagDto.Title.Length > 10)
{
throw new ValidationException("Tag is too long");
}
var regexForTagValidation = new Regex("^[a-zA-Z0-9#-]*$");
if (!regexForTagValidation.IsMatch(newTagDto.Title))
{
throw new ValidationException("Tag has invalid characters");
}
}
public async Task <IActionResult> UpdateTag(Guid id, TagToUpdateDto tag)
{
var tagEntity = await _tagsRepo.GetTagAsync(id);
if (tagEntity == null)
{
return(NotFound());
}
_mapper.Map(tag, tagEntity);
_tagsRepo.UpdateTag(tagEntity);
// It might be more proper to handle this error in the repository
try
{
await _tagsRepo.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException) when(!_tagsRepo.TagExists(id))
{
return(NotFound());
}
return(NoContent());
}
public bool TagExists(string tagName)
{
return(_tagsRepository.TagExists(tagName));
}
