public async Task <OperationResult <LendingRecord> > Lend(int bookId, int lenderId, DateTime @from, DateTime to)
{
var bookResult = await _bookRepository.GetAsync(bookId);
if (!bookResult.Success)
{
return(new OperationResult <LendingRecord>("Book not found!", bookResult.ErrorMessages));
}
var lenderResult = await _lenderRepository.GetAsync(lenderId);
if (!lenderResult.Success)
{
return(new OperationResult <LendingRecord>("Lender not found!", lenderResult.ErrorMessages));
}
var book = bookResult.Entity;
var record = new LendingRecord
{
From = @from,
To = to,
BookId = bookId,
LenderId = lenderId
};
var createResult = await _lendingRepository.CreateAsync(record);
if (!createResult.Success)
{
return(new OperationResult <LendingRecord>("Creation of lending record failed!", createResult.ErrorMessages));
}
book.IsAvailable = false;
var updateResult = await _bookRepository.UpdateAsync(book);
if (!updateResult.Success)
{
return(new OperationResult <LendingRecord>("Updating book availability failed!", updateResult.ErrorMessages));
}
return(createResult);
}