带外键的Django访问信息模型

Question

我的models.py

class Information(models.Model):
    id = models.CharField(max_length=200, primary_key=True)
    title = models.CharField(max_length=500)
    link = models.CharField(max_length=100)
    summary = models.CharField(max_length=1000)
    published = models.CharField(max_length = 100)

    def __str__(self):
        return self.title

class Search(models.Model):
    id = models.CharField(max_length=100, primary_key=True)
    searched_titles = models.CharField(max_length=100)
    searched_topics = models.CharField(max_length=100)
    number_found_articles = models.IntegerField()

    def __str__(self):
        return self.id

class Article_search(models.Model):
    found_articles = models.ForeignKey(
        Information, on_delete=models.CASCADE, default=None, primary_key=True)
    search_details = models.ForeignKey(
        Search, on_delete=models.CASCADE)

我的views.py

def show_articles_with_this_filter_id(request):
    alles = Article_search.objects.all()
    print(alles)

我得到的错误：(1054, "1054 (42S22): 'field list' 中的未知列 'database_article_search.found_articles_id'", '42S22')

如果我让我的 models.py Article_search class 像这样：

class Article_search(models.Model):
    found_articles = models.ForeignKey(
        Information, on_delete=models.CASCADE, default=None)
    search_details = models.ForeignKey(
        Search, on_delete=models.CASCADE)

我收到此错误：(1054, "1054 (42S22): Unknown column 'database_article_search.id' in 'field list'", '42S22')

我知道每个模型都需要一个主键，但我不明白为什么都报错。请有人帮我访问这个模型的数据

根据建议，我将 models.py 文件设为：

class Information(models.Model):
    id = models.CharField(max_length=200, primary_key=True)
    title = models.CharField(max_length=500)
    link = models.CharField(max_length=100)
    summary = models.CharField(max_length=1000)
    published = models.CharField(max_length = 100)

    def __str__(self):
        return self.title

class Search(models.Model):
    id = models.CharField(max_length=100, primary_key=True)
    searched_titles = models.CharField(max_length=100)
    searched_topics = models.CharField(max_length=100)
    number_found_articles = models.IntegerField()

    def __str__(self):
        return self.id

class Article_search(models.Model):
    found_articles = models.OneToOneField(
        Information,
        on_delete=models.CASCADE,
        primary_key=True,)
    search_details = models.OneToOneField(
        Search, on_delete=models.CASCADE)

当我尝试使用 views.py 从 Article_search table 获取所有信息时，我收到错误消息：(1054, "1054 (42S22): Unknown column 'database_article_search.found_articles_id' 在 'field list'", '42S22')

Answer 1

外键永远不能成为其他模型的主键，要实现这一点，您必须使用 OneToOne 字段而不是外键。

带外键的Django访问信息模型

Django access information model with foreign key

django

django-models

django-views

foreign-keys