public Book DeleteBook(int id, string path)
{
var book = _dbContext.Books
.Include(b => b.BookCopies)
.Where(b => b.Id == id)
.SingleOrDefault();
if (book == null)
{
throw new KeyNotFoundException("Book not found.");
}
else
{
if (!IsBookAvailable(book.Id))
{
throw new BookNotAvailableException("The specified book is currently involved in some loans.");
}
foreach (var bookCopy in book.BookCopies)
{
SetNullOnBookCopyCascade(bookCopy.Id);
}
File.Delete(path);
_dbContext.Books.Remove(book);
_dbContext.SaveChanges();
return(book);
}
}
public void CreateBook(BookSubmitModel bookSubmitModel)
{
_libraryDbContext.Books.Add(new Book()
{
Title = bookSubmitModel.Title
});
_libraryDbContext.SaveChanges();
}
public Category CreateCategory(string name)
{
VerifyCategoryName(name);
Category category = _dbContext.Categories.Add(new Category
{
Name = name.Trim()
});
_dbContext.SaveChanges();
return(category);
}
public void ApproveLoanRequest(int bookCopyId, int loanId, int daysNumberForLateApprovedLoans)
{
// Find loan by ID.
var loanToApprove = _dbContext.Loans.Find(loanId);
// Check if ID of BookCopy corresponds to the ID of book.
bool bookCopyIdCorresponds = _dbContext.Books
.Include(b => b.BookCopies)
.Single(b => b.Id == loanToApprove.BookId)
.BookCopies
.Any(bc => bc.Id == bookCopyId);
// Check if the book copy is available for loan.
bool isNotAvaialble =
_dbContext.Loans
.Where(l => l.BookCopyId == bookCopyId &&
(l.Status == LoanStatus.Approved || l.Status == LoanStatus.InProgress))
.Any();
if (isNotAvaialble)
{
throw new BookCopyNotAvailableException();
}
if (bookCopyIdCorresponds)
{
// Set status to Approved.
loanToApprove.BookCopyId = bookCopyId;
loanToApprove.Status = LoanStatus.Approved;
loanToApprove.BookPickUpLimitDate = DateTime.Now.AddDays(daysNumberForLateApprovedLoans);
loanToApprove.ApprovingDate = DateTime.Now;
_dbContext.SaveChanges();
}
else
{
throw new InvalidBookCopyIdException();
}
}
public void Save()
{
context.SaveChanges();
}
