I want to make a book classification
there are two categories:
(id(), name)
(id(), fist_type(), name)there is also a book information table
()
when you want to add book information in the xadmin background, select the first category first, and then select the second category
from django.db import models
-sharp Create your models here.
class BookFirstType(models.Model):
id = models.AutoField(primary_key=True)
name = models.CharField("", max_length=200)
def __str__(self):
return self.name
class Meta:
verbose_name = ""
verbose_name_plural = verbose_name
class BookSecondType(models.Model):
id = models.AutoField(primary_key=True)
first_type = models.ForeignKey(BookFirstType, on_delete=models.CASCADE, verbose_name="") -sharp ,
name = models.CharField("", max_length=200)
def __str__(self):
return self.name
class Meta:
verbose_name = ""
verbose_name_plural = verbose_name
class BookInfo(models.Model):
id = models.AutoField(primary_key=True)
second_type = models.ForeignKey(BookSecondType, on_delete=models.CASCADE, verbose_name="")
name = models.CharField("", max_length=200)
author = models.CharField("", max_length=200)
note = models.TextField("", max_length=10000)
money = models.CharField("", max_length=200)
def __str__(self):
return self.name
class Meta:
verbose_name = ""
verbose_name_plural = verbose_name