如何使用 Django 中的通用关系向我的博客文章添加喜欢答案

【问题标题】：How to add likes to my blog posts using generic relationships in Django如何使用 Django 中的通用关系向我的博客文章添加喜欢
【发布时间】：2021-01-26 19:00:01
【问题描述】：

我正在尝试使用通用关系在 Django 中添加喜欢/不喜欢的功能。有人可以帮我吗？

我的帖子模型



class Post(models.Model):
    title = models.CharField(max_length=225)
    post_image = models.ImageField(null=True, blank=True,  upload_to="images/")
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    body = models.TextField()
    post_date = models.DateTimeField(auto_now_add=True)
    
    
    def __str__(self):
        return self.title + ' | '  + str(self.author)

    class Meta:
        ordering = ['-post_date',]

    def get_absolute_url(self):
        return reverse('post-detail', args=(str(self.id)),)

提前致谢！

【问题讨论】：

标签： python django django-models django-generic-relations

【解决方案1】：

创建一个新类，如下所示：

class LikedPost(models.Model):
    user = models.ForeignKey(User,on_delete=models.CASCADE)
    post = models.ForeignKey(Post, on_delete=models.CASCADE)
    liked_date = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return self.post.title + " liked by " + self.user.username

然后，每当用户点击like 按钮时，请创建一个新的LikedPost，如果不存在user，喜欢post 的like 函数，否则删除LikedPost 的dislike 函数.

@login_required
def hit_like_button(request, pk):
    # Get the id of post
    post = get_object_or_404(Post, pk=pk)

    # Create a new LikedPost if this post is not liked by this user.
    liked_post, created = LikedPost.objects.get_or_create(
        post=post,
        user=request.user
    )
    # If not created new LikedPost <=> exist LikedPost = dislike.
    if not created:  #If get_or_create() function not created a new LikedPost
        liked_post.delete()
        messages.info(request, "This post was disliked.")
    else: # If created a new LikedPost => this user did not like this post 
        liked_post.save()
        messages.info(request, "This post was liked.")
    return redirect('home')

【讨论】：