Question

最近我正在写博客。帖子具有类别和子类别的地方。这是我的模型。py

from django.db import models
from django.contrib.auth.models import User
from django.utils import timezone
from ckeditor_uploader.fields import RichTextUploadingField

class Category(models.Model):
    title = models.CharField(max_length=50, unique=True)
    def __str__(self):
    return f"{self.title}"

class SubCategory(models.Model):
    category = models.ForeignKey(Category, on_delete=models.CASCADE)
    title = models.CharField(max_length=50, unique=True)
    def __str__(self):
        return f"{self.title}"

class Author(models.Model):
    name = models.CharField(max_length=100)
    email = models.EmailField(max_length=100)
    phone_no = models.CharField(max_length=14)
    details = models.TextField(null=True,blank=True)

    def __str__(self):
        return f"{self.name}"

class Post(models.Model):
    author = models.ForeignKey(Author, default=1,blank=True, 
        null=True, on_delete=models.SET_DEFAULT)

    category = models.ForeignKey(Category,on_delete=models.CASCADE, 
        null=True)

    sub_category = models.ForeignKey(SubCategory, 
        on_delete=models.CASCADE, null=True, blank=True)

    title = models.CharField(max_length=250)
    featured_image = models.ImageField( 
        upload_to="post_featured_image",null=False )

    content = RichTextUploadingField()
    podcast = models.FileField(upload_to="post_podcast", 
        blank=True,null=True)

    uploaded_on = models.DateTimeField(default=timezone.now)
    viewed = models.IntegerField(default=0,editable=False)

    def __str__(self):
        return f"{self.title}"

现在，我可以从Django管理面板中为帖子选择类别和子类别。但是问题是我可以选择一个类别，任何子类别，即使该子类别都不是所选类别的子类别。因此，帖子有一个类别和一个子类别。但是子类别的父类别与帖子的类别不同。因此，我希望我只能选择那些子类别，这些子类别是我为帖子选择的所选类别的子类别。像下一个字段一样，必须依赖上一个字段。怎么做？对不起，我的英语不好。谢谢。

如何在Django中显示选定类别的特定子类别

0 个答案: