/// <summary>
/// Creates the specified item.
/// </summary>
/// <param name="item">The item.</param>
public void Create(BookRentEvent item)
{
this.ValidateBookRentEvent(item);
this.context.BookRentEvents.Add(item);
this.context.SaveChanges();
}
/// <summary>
/// Updates the specified item.
/// </summary>
/// <param name="item">The item.</param>
/// <returns>
/// Returns the updated item.
/// </returns>
public BookRentEvent Update(BookRentEvent item)
{
this.ValidateBookRentEvent(item);
var bookRentEvent = this.context.BookRentEvents.Include(br => br.Book).Include(br => br.User)
.FirstOrDefault(br => br.BookId == item.BookId && br.UserId == item.UserId &&
br.DateOfRenting == item.DateOfRenting && br.DateOfReturn == null); //The book was returned if DateOfReturn is not null
bookRentEvent.NumberOfCopiesReturned += item.NumberOfCopiesReturned;
if (item.NumberOfCopiesReturned == bookRentEvent.NumberOfCopiesRented)
{
bookRentEvent.DateOfReturn = DateTime.Today;
}
this.context.Entry(bookRentEvent).State = EntityState.Modified;
this.context.SaveChanges();
return(bookRentEvent);
}
/// <summary>
/// Validates the book rent event.
/// </summary>
/// <param name="item">The item.</param>
/// <exception cref="ArgumentNullException">item</exception>
/// <exception cref="ValidationException">
/// Renting user" + basicValidationExceptionMessage
/// or
/// Renting book" + basicValidationExceptionMessage
/// or
/// Renting dates" + basicValidationExceptionMessage
/// </exception>
private void ValidateBookRentEvent(BookRentEvent item)
{
var basicValidationExceptionMessage = " invalid. Please re-input the data and try again.";
if (item == null)
{
throw new ArgumentNullException(nameof(item));
}
if (item.UserId <= 0)
{
throw new ValidationException("Renting user" + basicValidationExceptionMessage);
}
if (item.BookId <= 0)
{
throw new ValidationException("Renting book" + basicValidationExceptionMessage);
}
if (item.DateOfRenting == DateTime.MinValue || item.DateToReturn == DateTime.MinValue)
{
throw new ValidationException("Renting dates" + basicValidationExceptionMessage);
}
}
