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,)
