Question

假设我们有一个 MarkPost 模型。此模型与发布模型具有ForeinKey关系。

class Post(models.Model):
    TITLE = (
             ('1', 'USA'),
             ('2', 'Europe'), )
    title =  models.CharField(max_length=1, choices=TITLE)

class MarkPost(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    post = models.ForeignKey(Post, on_delete=models.CASCADE, 
                                             related_name="marked")

示例：

foo_post = Post.objects.create(title="1")
marked_post1 = MarkPost.objects.create(user="Foo", post=foo_post)

我试图写一些信号通知，如果另一个Post实例使用值 marked_post1.post.title 制作，请通过 marked_post1 通知相关用户.I为此目的发挥了信号功能。

signals.py

def created_post(sender, instance, created, **kwargs):
    marked = MarkPost.objects.get(pk=1)
    marked_title = marked.post.title
    if created and instance.title == marked_title :
        #logic of my code
        print(" new post made ")

post_save.connect(created_post, sender=Post)

这适用于一个实例但是如何以标记Post的每个用户的一般方式执行此操作？

Answer 1

假设您在MarkPost的id计算后面有一个定义的逻辑，

def logic_to_find_markpost_id(req_data):
    # do stuff to find MarkPost's id
    return markpost_id


def created_post(sender, instance, created, **kwargs):
    markpost_id = logic_to_find_markpost_id(req_data)
    marked = MarkPost.objects.get(pk=markpost_id)
    marked_title = marked.post.title
    if created and instance.title == marked_title:
        # logic of your code
        print(" new post made ")


post_save.connect(created_post, sender=Post)

使用django信号通知用户_Django

1 个答案: