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在这里,我想要加入两个表,在Post表中增加类似值,在UserLikes表中添加另一行,使用当前User,PostId,has_liked = True
。还要检查当前用户是否已经喜欢当前的Post?以下是我的代码。如何编写在Django中连接两个表的查询?
models.py
class Posts(models.Model):
title = models.CharField("Title", max_length=140)
url = models.FileField("URL")
likes = models.IntegerField("Likes", default=0)
by = models.ForeignKey(User)
date = models.DateTimeField(auto_now_add=True)
def __str__(self):
return self.title + ' by ' + str(self.by)
class UserLikes(models.Model):
post = models.ForeignKey(Posts)
user = models.ForeignKey(User)
has_liked = models.BooleanField("Liked", default=False)
def __str__(self):
return str(self.post) + ' by ' + str(self.user)
views.py
def like(request, pk):
if request.POST :
post = get_object_or_404(Posts, pk=pk)
print(request.user)
obj = UserLikes.objects.filter(post_id__in=post.id, user=request.user)
try:
if obj.has_liked is not True:
obj.post_id = post.id
obj.user = request.user
obj.has_liked = True
obj.save()
post.likes = str(int(post.likes) + 1)
post.save()
except AttributeError:
return HttpResponse(post.likes)
else:
return HttpResponse(post.likes, {'like': 'disabled'})
urls.py
url(r'^(?P<pk>\d+)/like/$', views.like, name='likes'),
那么,这将是该查询,在views.py文件?
谢谢@Sayse,但我不明白的是如何限制每个用户只喜欢一次,并将其存储在UserLikes表中。还有如何检索它,也就是说,当索引页打开时,查询会是什么? – CapJ
@CapJ如果您只希望每个用户都喜欢每个帖子,只需在UserLikes模型中设置unique_together =('post','user')':https://docs.djangoproject.com/en/1.10/ref/models/options /#unique-together –
谢谢@elkubo确实帮了我。 – CapJ