views.py

import datetime
from django.shortcuts import render, redirect
from django.contrib.contenttypes.models import ContentType
from django.utils import timezone
from django.db.models import Sum
from django.core.cache import cache
from django.contrib import auth
from django.urls import reverse
from read_statistics.utils import get_seven_days_read_data, get_today_hot_data, get_yesterday_hot_data
from blog.models import Blog

# Create your views here.
def get_7_days_hot_blogs():
    today = timezone.now().date()
    date = today - datetime.timedelta(days=7)
    blogs = Blog.objects \
        .filter(read_details__date__lt=today, read_details__date__gte=date) \
        .values('id', 'title') \
        .annotate(read_num_sum=Sum('read_details__read_num')) \
        .order_by('-read_num_sum')
    return blogs[:7]

def home(request):
    blog_content_type = ContentType.objects.get_for_model(Blog)
    dates, read_nums = get_seven_days_read_data(blog_content_type)

    # 获取七天热门博客的缓存数据
    hot_blogs_for_7_days = cache.get('hot_blogs_for_7_days')
    if hot_blogs_for_7_days is None:
        hot_blogs_for_7_days = get_7_days_hot_blogs()
        cache.set('hot_blogs_for_7_days', hot_blogs_for_7_days, 3600)

    context = {}
    context['dates'] = dates
    context['read_nums'] = read_nums
    context['today_hot_data'] = get_today_hot_data(blog_content_type)
    context['yesterday_hot_data'] = get_yesterday_hot_data(blog_content_type)
    context['hot_blogs_for_7_days'] = hot_blogs_for_7_days
    return render(request, 'home.html', context)

def login(request):
    username = request.POST.get('username', '')
    password = request.POST.get('password', '')
    user = auth.authenticate(request, username=username, password=password)
    referer = request.META.get('HTTP_REFERER', reverse('home'))
    if user is not None:
        auth.login(request, user)
        return redirect(referer)
    else:
        return render(request, 'error.html', {'message': '用户名或密码不正确！'})