列表页面已分页,仅显示 10 篇期刊文章。尽管如此,仍有 95 个查询正在执行。它影响页面加载速度。加载时间不是 <1 秒,而是大约 4-5 秒。 这是我的代码,请检查并让我知道如何优化。 View .py
class PostListView(LoginRequiredMixin,ListView):
model = Post
paginate_by = 10
def get_queryset(self):
qs = super(PostListView, self).get_queryset().filter(Q(
Q(language_id__in=self.request.user.native_language),
~Q(user_id__in=self.request.user.forbidden_user_list))).order_by('-created')
return qs
def get_context_data(self, **kwargs):
context = super(PostListView, self).get_context_data(**kwargs)
context['list_type'] = 'all'
模型.py
class Post(models.Model):
user = models.ForeignKey(to=settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
title = models.CharField(max_length=60)
text = models.TextField()
native_text = models.TextField(blank=True)
created = models.DateTimeField(default=timezone.now, db_index=True)
# updated = models.DateTimeField(auto_now=True)
# is_corrected = models.BooleanField(default=False)
users_like = models.ManyToManyField(settings.AUTH_USER_MODEL, related_name='posts_liked',
blank=True)
language = models.ForeignKey('account.Language', on_delete=models.SET_NULL, null=True)
def __str__(self):
return self.text
def get_absolute_url(self):
return reverse('post-detail', args=[str(self.id)])
@property
def get_correctors(self):
from account.models import Profile as User
result = list(set(User.objects.all().filter((Q(correctedrows__post_id=self.id) | Q(perfectrows__post_id=self.id) | Q(comment__post_id=self.id)))))
return result
最佳答案
在您的 get_queryset
方法中,您应该尝试使用 select_related和 prefetch_related获取您将在模板中使用的任何内容。
例如,如果您在模板中执行 post.user.name
,这将导致额外的查询。尝试这样的事情:
def get_queryset(self):
qs = super(PostListView, self).get_queryset().select_related('user', 'language'). prefetch_related('users_like').filter(Q(
Q(language_id__in=self.request.user.native_language),
~Q(user_id__in=self.request.user.forbidden_user_list))).order_by('-created')
return qs
关于python - 我的 Django 查询 : how to improve the speed of list view,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58972074/