Django - many built table CRUD

Many table structure

ForeignKey - foreign key to another table associated

class Book (models.Model): 
    title = models.CharField (MAX_LENGTH = 32 ) 
    Pub = models.ForeignKey ( ' Publisher ' , on_delete = models.CASCADE) # foreign key - associated table other table

 

Inquire

= models.Book.objects.all all_books () # get all data 
Print (all_books)
 for Book in all_books:
     Print (Book)   # obtain a data object 
    Print (book.pk)   # primary key data object ID 
    Print (Book. title)   # value in the title field of the data object 
    Print (book.pub, type (book.pub))   # object is a foreign key 
    Print (book.pub_id, type (book.pub_id))   # object ID foreign key

 

New

DEF book_add (Request):
     IF request.method == ' the POST ' :   # determination request method 
        title request.POST.get = ( ' title ' )   # 'title' attribute value acquired value (typing) by the input frame name = 
        = request.POST.get the pub_id ( ' the pub_id ' )   # above 
        # models.Book.objects.create (title = title, Pub = models.Publisher.objects.get (= the pub_id PK)) 
        models.Book.objects.create ( title = title, the pub_id = the pub_id)   # synchronized to the database (database field = value obtained) 
        return the redirect ( ' / book_list / ' )  # Redirect, jump page

 

delete

DEF book_del (Request): 
    pk = request.GET.get ( ' pk ' )   # Get value corresponding to the value of the url pk 
    models.Book.objects.filter (pk = pk) .Delete ()   # Comparative Book table pk Get value pk value of url, delete the same 
    return the redirect ( ' / book_list / ' )

 

edit

DEF book_edit (Request): 
    pk = request.GET.get ( ' pk ' )   # obtain pk value corresponding to the GET request transmitted 
    book_obj models.Book.objects.filter = (pk = pk) .first ()   # acquires values corresponding pk data objects 
    IF request.method == ' the POST ' : 
        title = request.POST.get ( ' title ' )   # INPUT box name = 'title' attribute value corresponding to the value of 
        the pub_id = request.POST.get ( ' the pub_id ' ) 
        book_obj.title = title   # modify the value of the book table data object
        pub_id = book_obj.pub_id   # acquired by pub_id value to the value of the option, and to modify the values in the table book, (pub_id foreign key pk correspond to a value corresponding to the table data publisher) 
        book_obj.save ()   # submit data 
        return the redirect ( ' / book_list / ' )