基于Django框架利用Ajax实现点赞功能实例代码

from django.db import models
from django.contrib.contenttypes.fields import GenericForeignKey
from django.contrib.contenttypes.models import ContentType
from django.contrib.auth.models import User

# Create your models here.


# 用于记录点赞数量的模型
class LikeCount(models.Model):
 content_type = models.ForeignKey(ContentType, on_delete=models.DO_NOTHING)
 object_id = models.PositiveIntegerField()
 content_object = GenericForeignKey('content_type', 'object_id')
 # 用于记录点赞数量的字段
 like_num = models.IntegerField(default=0)


# 用于记录点赞状态的模型
class LikeRecord(models.Model):
 content_type=models.ForeignKey(ContentType, on_delete=models.DO_NOTHING)
 object_id=models.PositiveIntegerField()
 content_object=GenericForeignKey('content_type', 'object_id')
 # 记录点赞的用户
 like_user = models.ForeignKey(User, on_delete=models.DO_NOTHING)
 # 记录点赞的时间
 like_time = models.DateTimeField(auto_now_add=True)

from django.shortcuts import render, HttpResponseRedirect
from django.contrib.contenttypes.models import ContentType
from django.http import JsonResponse
from .models import LikeCount, LikeRecord

# Create your views here.


# 数据操作成功返回数据方法
def success_response(like_num):
 data = {}
 data['status'] = 'SUCCESS'
 data['like_num'] = like_num
 return JsonResponse(data)


# 数据操作失败返回信息的方法
def error_response(message):
 data = {}
 data['status'] = 'ERROR'
 data['message'] = message
 return JsonResponse(data)


def like_up(request):
 # 得到GET中的数据以及当前用户
 user = request.user
 # 判断用户是否登录
 if not user.is_authenticated:
  return error_response('未登录，不能进行点赞操作')
 content_type = request.GET.get('content_type')
 content_type = ContentType.objects.get(model=content_type)
 object_id = request.GET.get('object_id')
 is_like = request.GET.get('is_like')

 # 创建一个点赞记录
 if is_like == 'true':
  # 进行点赞，即实例化一个点赞记录
  like_record, created = LikeRecord.objects.get_or_create(content_type=content_type, object_id=object_id, like_user=user)
  # 通过created来判断点赞记录是否存在，如果存在则不进行点赞，如果不存在则进行点赞数量加一
  if created:
   # 不存在点赞记录并且已经创建点赞记录，需要将点赞数量加一
   like_count, created = LikeCount.objects.get_or_create(content_type=content_type, object_id=object_id)
   like_count.like_num += 1
   like_count.save()
   return success_response(like_count.like_num)
  else:
   # 已经进行过点赞
   return error_response('已经点赞过')
 else:
  # 取消点赞
  # 先查询数据是否存在，存在则进行取消点赞
  if LikeRecord.objects.filter(content_type=content_type, object_id=object_id, like_user=user).exists():
   # 数据存在，取消点赞
   # 删除点赞记录
   LikeRecord.objects.get(content_type=content_type, object_id=object_id, like_user=user).delete()
   # 判断对应的点赞数量数据是否存在，如果存在则对点赞数量进行减一
   like_count, create = LikeCount.objects.get_or_create(content_type=content_type, object_id=object_id)
   if create:
    # 数据不存在，返回错误信息
    return error_response('数据不存在，不能取消点赞')
   else:
    # 数据存在，对数量进行减一
    like_count.like_num -= 1
    like_count.save()
    return success_response(like_count.like_num)
  else:
   # 数据不存在，不能取消点赞
   return error_response('数据不存在，不能取消点赞')