Question

我是Django的新手，但是我试图用来自其他模型VideoTypes的视频类型替换类别常量。我该怎么办？

from django.db import models

# from django.contrib.auth import get_user_model

# User = get_user_model()
CATEGORIES = (
    ('Executive Speaker Series', 'Executive Speaker Series'),
    ('College 101', 'College 101'),
    ('Fireside Chat', 'Fireside Chat'),
    ('Other', 'Other')
)


# Create your models here.
class VideoType(models.Model):
    type = models.CharField(max_length=255)
    def __str__(self):
        return self.type

class Video(models.Model):
    title = models.CharField(max_length=255)
    link = models.CharField(max_length=1000)
    category = models.CharField(choices=CATEGORIES, max_length=255)
    timestamp = models.DateTimeField(auto_now_add=True)
    # owner = models.ForeignKey(User, on_delete=models.CASCADE)

    def __str__(self):
        return self.title

Answer 1

您正在寻找ForeignKey字段。它还需要设置行为，以删除相关模型时的行为，请参见on_delete描述。

VideoType(models.Model):
    type = models.CharField(max_length=255)
    def __str__(self):
        return self.type

class Video(models.Model):
    title = models.CharField(max_length=255)
    link = models.CharField(max_length=1000)
    category = models.ForeignKey(VideoType, on_delete=models.SET_NULL) # category is now referring to VideoType model
    timestamp = models.DateTimeField(auto_now_add=True)

Answer 2

您拥有的实现需要带变量而不是字符串的元组。

将您的CATEGORIES = ( (Executive_Speaker_Series, 'Executive Speaker Series'), (College_101, 'College 101'), (Fireside_Chat, 'Fireside Chat'), (Other, 'Other') )变量更改为

{{1}}

创建依赖于Django中另一个模型的模型ChoiceField

2 个答案: