django 如何返回三级联动 json数据

Question

就是根据数据库的数据数量生成这种json数据，应该怎么做

Answer 1

提问者 huoxingd 2018-07-14 11:35:01

class Nj1(models.Model):
   fl1 = models.CharField(max_length=50, null=True, blank=True)

   class Meta:
       verbose_name = "年级1"
       verbose_name_plural = verbose_name

   def __str__(self):  # 作用:在后台管理中显示每个不同数据的名称:self.username, py3为:__str__
       return self.fl1


class Nj2(models.Model):
   fl2 = models.CharField(max_length=50, null=True, blank=True)
   nj2 = models.ForeignKey(Nj1, null=True, blank=True, related_name='nj2')

   class Meta:
       verbose_name = "年级2"
       verbose_name_plural = verbose_name

   def __str__(self):#作用:在后台管理中显示每个不同数据的名称:self.username, py3为:__str__
       return self.fl2


class Nj3(models.Model):
   fl3 = models.ForeignKey(Nj2, null=True, blank=True, related_name='fl3')
   nj3 = models.CharField(max_length=50, null=True, blank=True)

   class Meta:
       verbose_name = "年级3"
       verbose_name_plural = verbose_name

   def __str__(self):  # 作用:在后台管理中显示每个不同数据的名称:self.username, py3为:__str__
       return self.nj3

Answer 2

bobby 2018-07-13 11:56:48

这个要和数据库的model设计关联起来 你的model如何设计的？

• 提问者 huoxingd #1

  class Nj1(models.Model):
      fl1 = models.CharField(max_length=50, null=True, blank=True)
  
      class Meta:
          verbose_name = "年级1"
          verbose_name_plural = verbose_name
  
      def __str__(self):  # 作用:在后台管理中显示每个不同数据的名称:self.username, py3为:__str__
          return self.fl1
  
  
  class Nj2(models.Model):
      fl2 = models.CharField(max_length=50, null=True, blank=True)
      nj2 = models.ForeignKey(Nj1, null=True, blank=True, related_name='nj2')
  
      class Meta:
          verbose_name = "年级2"
          verbose_name_plural = verbose_name
  
      def __str__(self):#作用:在后台管理中显示每个不同数据的名称:self.username, py3为:__str__
          return self.fl2
  
  
  class Nj3(models.Model):
      fl3 = models.ForeignKey(Nj2, null=True, blank=True, related_name='fl3')
      nj3 = models.CharField(max_length=50, null=True, blank=True)
  
      class Meta:
          verbose_name = "年级3"
          verbose_name_plural = verbose_name
  
      def __str__(self):  # 作用:在后台管理中显示每个不同数据的名称:self.username, py3为:__str__
          return self.nj3