django - 我如何在 django-rest-framework 中制作 'view_count'？

Question

谢谢你一直以来。我会问。(我很抱歉英语不太好)

我正在使用 React 作为前端，所以我刚刚启动了 Django rest 框架。

但是 django-rest-framework 让我感到困惑，所以我问。

作为一个简单的例子，当我点击 crud 中的显示页面时，我想自动增加 view_count。

我应该在 app_name/api/views.py 中写什么功能？

这是我的代码..

# notice/models.py

from django.db import models

# Create your models here.
class Notice(models.Model):
  title = models.CharField(max_length=120)
  description = models.TextField()
  view_count = models.IntegerField(default=0)

  def __str__(self):
    return self.title

# notice/api/views.py

from rest_framework import viewsets
from notice.models import Notice
from .serializers import NoticeSerializer
from django.http import JsonResponse

class NoticeViewSet(viewsets.ModelViewSet):
  serializer_class = NoticeSerializer
  queryset = Notice.objects.order_by('title')

# notice/api/serializers.py

from rest_framework import serializers
from notice.models import Notice

class NoticeSerializer(serializers.ModelSerializer):
  class Meta:
    model = Notice
    fields = ('id','title','description','view_count')

Answer 1

您可以在 NoticeViewSet.retrieve() 方法中添加增量。这是当您检索单个对象时调用的 View 方法，因此它是有道理的。您也可以将它添加到 list View 方法中，但是根据查询集的大小，它可能会变得很慢。

class NoticeViewSet(viewsets.ModelViewSet):
    serializer_class = NoticeSerializer
    queryset=Notice.objects.order_by('title')

    def retrieve(self, request, *args, **kwargs):
        obj = self.get_object()
        obj.view_count = obj.view_count + 1
        obj.save(update_fields=("view_count", ))
        return super().retrieve(request, *args, **kwargs)

如果您还想在列出通知时计算浏览量，请使用此类:

class NoticeViewSet(viewsets.ModelViewSet):
    serializer_class = NoticeSerializer
    queryset=Notice.objects.order_by('title')

    def retrieve(self, request, *args, **kwargs):
        obj = self.get_object()
        obj.view_count = obj.view_count + 1
        obj.save(update_fields=("view_count", ))
        return super().retrieve(request, *args, **kwargs)

    def list(self, request, *args, **kwargs):
        # You could also increment the view count if people see the `Notice` in a listing.
        queryset = self.filter_queryset(self.get_queryset())
        for obj in queryset:
            obj.view_count = obj.view_count + 1
            obj.save(update_fields=("view_count", ))
        return super().list(request, *args, **kwargs