我有一个Django应用程序,目前在本地主机上运行。有些页面需要更长的时间,因此出于调试原因,我使用以下简单代码计算了在一个基于类的视图中花费的时间:
class DiscoverView(LoginRequiredMixin, ListView):
model = MyModel
template_name = "app1/discover.html"
context_object_name = 'influencers' # not necessary, default is object_list
def get_context_data(self, **kwargs):
start_time = time.time()
# ...
# Some tasks which I tought they are the reasons of long response time
# ...
print(time.time() - start_time, "seconds took to complete...")
return context
在实验之后,我发现这个视图需要0.01秒才能完成,而页面加载需要大约5秒
为了进一步调试,我深入研究了Chrome开发工具。在网络选项卡中,页面的“完成”时间为5.86秒。我还运行了Lighthouse测试,该测试表明服务器的初始响应时间约为2秒
我不明白为什么这0.01秒变为2秒,我还使用了django调试工具栏来检查数据库查询时间,这并不长。我的应用程序也在生产环境(Heroku)中运行,加载时间当然要糟糕得多,但我觉得我需要首先在本地解决这个问题
我感谢您提供的任何帮助或调试建议,如果您需要有关应用程序/系统的更多信息,请告诉我
编辑:这里是get_context_data()
的内部:
def get_context_data(self, **kwargs):
start_time = time.time()
context = super().get_context_data(**kwargs)
platform = self.kwargs['platform']
page_no = self.request.GET.get('page') # make it int to multiply when slicing
if page_no is not None: page_no = int(page_no)
ITEMS_PER_PAGE = 10
parents = None
if platform == 'instagram':
# Will implement this later
pass
elif platform == 'tiktok':
tiktok_influencers = TiktokInfluencer.objects.all()
context['platform_counter'] = tiktok_influencers.count()
parents = InfluencerParent.objects.filter(tiktok__id__in = tiktok_influencers)
elif platform == 'youtube':
youtube_influencers = YoutubeInfluencer.objects.all()
context['platform_counter'] = youtube_influencers.count()
parents = InfluencerParent.objects.filter(youtube__id__in = youtube_influencers)
elif platform == 'twitch':
twitch_influencers = TwitchInfluencer.objects.all()
context['platform_counter'] = twitch_influencers.count()
parents = InfluencerParent.objects.filter(twitch__id__in = twitch_influencers)
elif platform == 'clubhouse':
clubhouse_influencers = ClubhouseInfluencer.objects.all()
context['platform_counter'] = clubhouse_influencers.count()
parents = InfluencerParent.objects.filter(clubhouse__id__in = clubhouse_influencers)
else:
# unknown platform, redirect to 404
pass
# Pagination stuff
if page_no == None or page_no == 1:
parents = parents[:ITEMS_PER_PAGE]
else:
parents = parents[(page_no-1) * ITEMS_PER_PAGE : (page_no) * ITEMS_PER_PAGE]
context['influencers'] = parents
context['platform'] = platform
print(time.time() - start_time, "seconds took DiscoverView to complete...")
return context
编辑2:我需要更多帮助,因此我正在添加模型和模板信息:
# models.py
class InfluencerParent(models.Model):
'''
Parent class which points to influencers' IG, YT & other social media platform accounts
'''
def __str__(self):
if self.instagram.first():
return self.instagram.first().fullname
else:
return "None"
class InstagramInfluencer(models.Model):
# some fields...
influencer_parent = models.ForeignKey(InfluencerParent, on_delete=models.SET_NULL, related_name='instagram', default=None, blank=True, null=True)
class YoutubeInfluencer(models.Model):
# some fields...
influencer_parent = models.ForeignKey(InfluencerParent, on_delete=models.SET_NULL, related_name='instagram', default=None, blank=True, null=True)
class TiktokInfluencer(models.Model):
# some fields...
influencer_parent = models.ForeignKey(InfluencerParent, on_delete=models.SET_NULL, related_name='instagram', default=None, blank=True, null=True)
class TwitchInfluencer(models.Model):
# some fields...
influencer_parent = models.ForeignKey(InfluencerParent, on_delete=models.SET_NULL, related_name='instagram', default=None, blank=True, null=True)
class ClubhouseInfluencer(models.Model):
# some fields...
influencer_parent = models.ForeignKey(InfluencerParent, on_delete=models.SET_NULL, related_name='instagram', default=None, blank=True, null=True)
模板示例:
# template (not the all for the sake of clarity)
<!-- discover.html
A single template to list all influencers (IG, YT, Tiktok...)
Takes platform param from URL
In view we filtered parents according to the platform
For example if platform param is 'tiktok' I use this updated version:
parents = InfluencerParent.objects.filter(tiktok__isnull=False).prefetch_related('instagram', 'youtube', 'tiktok', 'twitch', 'clubhouse')
There parents influencers are who have tiktok accounts, in template I show all the social media cards in a tabbed design
So I need to send parent and acces parent.instagram.first.username
-->
{% for influencer in influencers %}
<div class="instagram" {% influencer.instagram.first == None %} disabled {% endif %}>
{{influencer.instagram.first.username}}
</div>
<div class="tiktok" {% influencer.tiktok.first == None %} disabled {% endif %}>
{{influencer.tiktok.first.username}}
</div>
<!--
.
.
OTHER SOCIAL MEDDIA ACCOUNTS OF THAT PARENT
.
.
-->
<div class="clubhouse" {% influencer.clubhouse.first == None %} disabled {% endif %}>
{{influencer.clubhouse.first.username}}
</div>
以下是我如何使用预回迁相关(选择相关错误):
elif platform == 'tiktok':
context['platform_counter'] = TiktokInfluencer.objects.count()
parents = InfluencerParent.objects.filter(tiktok__isnull=False).prefetch_related('instagram', 'youtube', 'tiktok', 'twitch', 'clubhouse')
# This is how I use prefetch_lated(), I need to send parent objecjts and their all (if exists) platform related influencer objects
# I acces Parent's all existing reverse foreign key fields in one template, for example:
# {{parent.influencer.username}}
# {{parent.youtube.follower_count}}
# {{parent.tiktok.fullname}}
# ...
# The row below gives error: 'Invalid field name(s) given in select_related: 'tiktok'. Choices are: (none)'
# Even tho I need to give all social platforms as params (select_related('instagram', 'youtube', 'tiktok', 'twitch', 'clubhouse'))
parents = InfluencerParent.objects.select_related('tiktok')
https://docs.djangoproject.com/en/3.2/ref/models/querysets/ 有助于建立一个基础“强> >选择相关的< /强>,对于具有外键关系的模型,通常对于M2M的模型来说,<强> > PrimthChuy相关。 在这里,我将提供一种“简单”的方法来实现与预取相关的。请记住,连接到数据库的调用不仅在
views.py
中,而且在模板中,访问属性可能会对数据库造成额外的影响(请参阅上面的链接以获得进一步的解释,即blog.author.homely)。因此,为了减少我们访问数据库的次数,我建议实现如下内容。现在,在没有看到模型、模板和实际SQL查询的情况下,这将是我最好的猜测我认为,只要添加我所做的编辑,就会大大改变查询量
如果你想知道它将如何改变。获取部分视图,并在shell中进行一些测试
现在,为了进一步完善您的代码,我将看一看预回迁,因为您可以使缓存查询与之前实现的内容类似
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