from django.shortcuts import render,HttpResponse
from django.views.generic import View
class Index(View):
    """
    class django.views.generic.base.View
    基于类的基础视图的核心。其它所有的基于类的视图都继承自这个基础类

    
    URL配置: url(r‘^index/(\d+)‘, Index.as_view(state=0)),
    """
    # as_view参数
    state = None
    # 该视图接收的HTTP方法
    http_method_names = [‘get‘, ‘post‘, ‘put‘, ‘patch‘, ‘delete‘, ‘head‘, ‘options‘, ‘trace‘,]

    def dispatch(self, request, *args, **kwargs):
        print("请求之前执行")
        obj = super(Index,self).dispatch(request, *args, **kwargs)
        print("请求之后执行")
        return obj

    def get(self, request,id):
        print(self.state)
        print(id)
        return HttpResponse("GET")

    def post(self, request):
        return HttpResponse("POST")

from django.contrib.auth.mixins import LoginRequiredMixin
from chouti.models import UserInfo
class UserDetailView(DetailView):
    """
    django.views.generic.detail.DetailView
    执行这个视图的时候，self.object 包含视图正在操作的对象(models)
    URL配置： url(r‘^(?P<user_id>\d+)$‘,views.UserDetailView.as_view()),
    """
    model = UserInfo
    template_name = ‘user.html‘  # 模板
    pk_url_kwarg = ‘user_id‘  # PublisherDetail.objects.filter(pk=user_id)
    

    def get_context_data(self, **kwargs):
        print("get_context_data")
        print(self.object.username)
        # 获取上下文对象,
        context = super(UserDetailView, self).get_context_data(**kwargs)
        context[‘now‘] = [33, 44]   # 添加额外的上文对象
        return context

from blog.models import Post
from django.views.generic import ListView
class PublisherList(ListView):
    """
    django.views.generic.list.ListView
    对于ListView来说，它需要显示的是多个object的信息，返回的是一个对象列表
    URL配置: url(r‘^publishers/(?P<match_title>\w+)$‘,views.PublisherList.as_view()),
    """
    
    # 数据来源是`model`和`queryset`， 后者优先级较高
    model = Post   # 返回所有对象
    queryset = Post.objects.filter(title__contains = ‘c‘)  # 返回 title包含"c"的对象
    context_object_name = ‘publisher‘  # 没有指定此参数时，上下文对象是 `object_list`
    template_name=‘post.html‘   # 模板
    # 实现动态过滤，捕获urls中的参数
    def get_queryset(self):
        print("get_queryset")
        return Post.objects.filter(title__contains = self.kwargs[‘match_title‘])
    

    # 用于添加额外的上下文对象
    def get_context_data(self, **kwargs):
        print("get_context_data")
        context = super(PublisherList, self).get_context_data(**kwargs)  # 获取上下文对象
        context[‘nn‘] = [‘11‘, ‘22‘]   # 把{‘nn‘:[‘11‘, ‘22‘]}添加到上下文对象
        return context