public bool RemoveImageById(Guid imageId)
{
if (imageId == null)
{
throw new ArgumentNullException("image id is null");
}
foreach (var userId in relationsDAL.GetUsersIdsByImageId(imageId).ToArray())
{
relationsDAL.RemoveRelation(userId, imageId);
}
return(imagesDAL.RemoveImageById(imageId));
}
public IEnumerable <UserDTO> GetUsersByImage(Guid imageId)
{
if (imageId == null)
{
throw new ArgumentNullException("image id is null");
}
try
{
imagesDAL.GetImageById(imageId);
}
catch (Exception e)
{
throw new ArgumentException("image id is incorrect, image doesn't exist", e);
}
return(usersDAL.GetAllUsers().Join(relationsDAL.GetUsersIdsByImageId(imageId),
user => user.Id, userId => userId, (user, userId) => new UserDTO
{
Id = userId, FirstName = user.FirstName, DateOfBirth = user.DateOfBirth, Email = user.Email, HashOfPassword = user.HashOfPassword, LastName = user.LastName, Nickname = user.Nickname
}));
}