PrimaryKeyRelatedField(queryset=Author.objects.all(),source='author',write_only=True)queryset:关联的主表的模型类对象QuerySetsoure:从表的关联键的名称案例:serializers.PrimaryKeyRelatedField(queryset=Author.objects.all(),source
return self.title 访问外键(Foreign Key)值 当你获取一个ForeignKey 字段时,你会得到相关的数据模型对象。例如: b = Book.objects.get(id=50) b.publisher <Publisher: Apress Publishing> b.publisher.website u'http://www.apress.com/' 对于用ForeignKey来定义的关系来说,在关系的另一端也能反向的追溯回来...
$ c=Coding.objects.get(text='女') % 查找女生 然后进行反向查询, $ c.list_set.all() % 通过foreignkey在子表list中查找女生 这里需要解释一下, list_set,“子表表名+_set”,注意全部是小写!!表示foreign_key 默认的属性名称。 我们可以通过related_name指定它的名称。例如, Gender = models.ForeignKey(...
_id, 而在 Article 模型中,外键可能叫做 author.我们希望有一个方法可以根据外键的类来检索外键对象,无论外键的名称是什么。...我们还可以在模型类中定义一个 get_foreign_key_to() 方法,该方法返回指向给定类的外键字段。...该方法返回了指向 Author 模型的外键字段,并将其存储在 author_foreign_key 变量中...
In older versions, foreign key updates were always done using save(). Use bulk=False if you require the old behavior.create(**kwargs)¶ Creates a new object, saves it and puts it in the related object set. Returns the newly created object: >>> b = Blog.objects.get(id=1) >>> ...
get_search_results( request, queryset, search_term, ) try: search_term_as_int = int(search_term) except ValueError: pass else: queryset |= self.model.objects.filter(age=search_term_as_int) return queryset, may_have_duplicates 这个实现比 search_fields = ('name', '=age') 更有效,...
常用值包括：'GET'、'POST' encoding：一个字符串，表示提交的数据的编码方式 如果为None则表示使...
returnUser.objects.get_or_create(username='deleted')[0] classMyModel(models.Model): user=models.ForeignKey(User, on_delete=models.SET(get_sentinel_user)) DO_NOTHING:啥也不做。 5.2 ManyToManyField接受下列可选参数,这些参数定义了关系是如何运行的。
Get foreign key related JSON objects in Django template Posted on 2022年8月8日 at 13:38 byStack OverflowRSS So I currently have an API response that encodes a many-to-one relationship both ways, where the one object (called Sagas) has a set of the many objects (called Arcs) relating to...
Get foreign key related JSON objects in Django template Posted on 2022年8月8日 at 13:38 byStack OverflowRSS So I currently have an API response that encodes a many-to-one relationship both ways, where the one object (called Sagas) has a set of the many objects (called Arcs) relating to...