partial void DeleteRental(Rental instance);
/// <author>Lars Toft Jacobsen</author>
/// <summary>
/// Rent media
/// </summary>
/// <param name="mediaId"></param>
/// <param name="credentials"></param>
/// <returns></returns>
public bool RentMedia(int mediaId, AccountCredentials credentials)
{
// Throws an exceptions if the credentials are not valid.
Account account = ValidateCredentials(credentials);
if (account == null)
{
throw new FaultException<Exception>(
new Exception("No credentials have been submitted."));
}
var db = new DatabaseDataContext();
// Check if the requested media exists.
if (!db.Medias.Exists(m => m.id == mediaId))
{
throw new FaultException<Exception>(
new Exception("The requested media does not exist"));
}
// Check if there already exist active rentals for the requested media.
// If there already is an active rental of the media, through an exception
// indicating so.
if (db.Rentals.Exists(
rental =>
rental.user_name.Equals(credentials.UserName) && rental.media_id == mediaId
&& rental.end_time > DateTime.Now))
{
throw new FaultException<Exception>(
new Exception("The requested media has already been rented."));
}
try
{
var r = new RentItDatabase.Rental
{
user_name = account.UserName,
media_id = mediaId,
start_time = DateTime.Now,
end_time = DateTime.Now.AddDays(14)
};
// Get the account information for the requesting user
var user = (from u in db.User_accounts
where u.user_name.Equals(credentials.UserName)
select u).Single();
// Get the media requested for rental.
var rentedMedia = (from m in db.Medias
where m.id == mediaId
select m).Single();
// If the user has not enough credits
if (user.credit < rentedMedia.price)
{
throw new FaultException<Exception>(
new Exception("The specifed user does not have enough credits to rent this media."));
}
// Update the user credit balance accordingly.
user.credit = user.credit - rentedMedia.price;
db.Rentals.InsertOnSubmit(r);
db.SubmitChanges();
}
catch (Exception)
{
throw new FaultException<Exception>(
new Exception("An internal error has occured. This is not related to the input."));
}
return true;
}
partial void UpdateRental(Rental instance);
partial void InsertRental(Rental instance);
private void detach_Rentals(Rental entity)
{
this.SendPropertyChanging();
entity.User_account = null;
}
private void detach_Rentals(Rental entity)
{
this.SendPropertyChanging();
entity.Media = null;
}
private void attach_Rentals(Rental entity)
{
this.SendPropertyChanging();
entity.Media = this;
}
