def list_libraries(request): if request.method == 'GET': all_libraries = Library.objects.all() for library in all_libraries: library.books = Book.objects.filter(location_id=library.id) template = 'libraries/list.html' context = {'all_libraries': all_libraries} return render(request, template, context) elif request.method == 'POST': form_data = request.POST new_library = Library() new_library.name = form_data['name'] new_library.address = form_data['address'] new_library.save() return redirect(reverse('libraryapp:libraries'))
def library_list(request): if request.method == 'GET': ## SQL METHOD # with sqlite3.connect(Connection.db_path) as conn: # conn.row_factory = create_library # db_cursor = conn.cursor() # db_cursor.execute(""" # SELECT # li.id, # li.title, # li.address, # b.id book_id, # b.title book_title, # b.author, # b.year_published, # b.isbn # FROM libraryapp_library li # JOIN libraryapp_book b ON li.id = b.location_id # """) # libraries = db_cursor.fetchall() ## ORM METHOD libraries = Library.objects.all() for library in libraries: library.books = Book.objects.filter(location_id=library.id) # # SQL METHOD # # Start with an empty dictionary # library_groups = {} # # Iterate the list of tuples # for library, book in libraries: # # If the dictionary does have a key of the current # # library's `id` value, add the key and set the value # # to the current library # if library.id not in library_groups: # library_groups[library.id] = library # library_groups[library.id].books.append(book) # # If the key does exist, just append the current # # book to the list of books for the current library # else: # library_groups[library.id].books.append(book) template = 'libraries/list.html' context = { # 'all_libraries': library_groups.values() 'all_libraries': libraries } return render(request, template, context) elif request.method == 'POST': form_data = request.POST # # SQL METHOD # with sqlite3.connect(Connection.db_path) as conn: # db_cursor = conn.cursor() # db_cursor.execute(""" # INSERT INTO libraryapp_library # ( # title, address # ) # VALUES (?, ?) # """, # (form_data['title'], form_data['address'])) # # ORM METHOD new_library = Library( title = form_data['title'], address = form_data['address'] ) new_library.save() return redirect(reverse('libraryapp:libraries')) ## SQL METHOD # def create_library(cursor, row): # _row = sqlite3.Row(cursor, row) # library = Library() # library.id = _row["id"] # library.title = _row["title"] # library.address = _row["address"] # # Note: You are adding a blank books list to the library object # # This list will be populated later (see below) # library.books = [] # book = Book() # book.id = _row["book_id"] # book.title = _row["book_title"] # book.author = _row["author"] # book.isbn = _row["isbn"] # book.year_published = _row["year_published"] # # Return a tuple containing the library and the # # book built from the data in the current row of # # the data set # return (library, book,)