把留言和回复都放到一张表里，然后给回复加一个标记，标记一下它是谁的回复，通过上节的案例可以启发：
我把所有的浏览和回复通过sql语句给它查出来，然后我通过上节的方法，把对应的回复都关联到各自的留言里，形成这么一个结构：
[{'name': 'leader-1', 'team': [{'name': 'lili'}, {'name': 'Tom'}]}, {'name': 'leader-2', 'team': [{'name': 'jack'}]}]
一实现发布留言：
1创建应用：
D:\PycharmProjects\linuxTangblog>python manage.py startapp message
2添加应用：
INSTALLED_APPS = [
'message',
]
3编写模型类：
from user.models import UserProfile
from topic.models import Topic
class Message(models.Model):
content =models.CharField(max_length=50,verbose_name='留言内容')
created_time = models.DateTimeField(auto_now_add=True)
parent_message = models.IntegerField(verbose_name='回复的留言id')
publisher = models.ForeignKey(UserProfile,on_delete=models.CASCADE)
topic = models.ForeignKey(Topic,on_delete=models.CASCADE)
4同步数据库：
D:\PycharmProjects\linuxTangblog>python manage.py makemigrations
D:\PycharmProjects\linuxTangblog>python manage.py migrate
5配置主路由：
path('v1/messages/',include('message.urls')),6配置子路由：
from django.urls import path
from . import views
urlpatterns = [
path('<int:topic_id>',views.message_view),
]
7编写视图：
先实现发布留言功能
from django.http import JsonResponse
from django.shortcuts import render
from tools.logging_dec import logging_check
import json
from topic.models import Topic
from message.models import Message
# Create your views here.
@logging_check
def message_view(request,topic_id):
#取出当前登录的用户
user = request.myuser
#取出所有数据
json_str = request.body
#把获取的json串转换为python对象
json_obj = json.loads(json_str)
#取出留言内容
content = json_obj['content']
#此值有可能取不到，给个默认值
parent_id = json_obj.get('parent_id',0)
#尝试获取一下文章
try:
topic = Topic.objects.get(id=topic_id)
except Exception as e:
result = {'code':10400,'error':'文章不存在'}
return JsonResponse(result)
#创建消息数据
#文章字段等于当前获取的文章，留言字段等于当前获取的content内容，回复的留言id等于当前获取的parent_id,发布者等于当前用户
Message.objects.create(topic=topic,content=content,parent_message=parent_id,publisher=user)
return JsonResponse({'code':200})
二实现查看留言：
因为留言在文章详情页里，所以我们需要把留言内容从数据库里取出来后，然后在文章详情页里组织数据
1打开topic/views.py,找到make_topic_res这个方法，在这个方法里有一个res[ 'data' ] ['messages'],我们之前给的是一个空值[ ]
#查出当前文章的所有留言,相当于拿到了春游的原始数据
all_messages = Message.objects.filter(topic=author_topic).order_by('-created_time')
#准备一个数组存留言，准备一个字段存回复
msg_list = []
rep_dic = {}
m_count = 0
#判断身份
for msg in all_messages:
if msg.parent_message:
#回复
#初始化留言字典框架
rep_dic.setdefault(msg.parent_message,[])
rep_dic[msg.parent_message].append({'msg_id':msg.id,'publisher':msg.publisher.nickname,'publisher_avatr':str(msg.publisher.avatar),'content':msg.content,'created_time':msg.created_time.strftime('%Y-%m-%d %H:%M:%S')})
else:
#留言
#计数
m_count += 1
msg_list.append({'id':msg.id,'content':msg.content,'publisher':msg.publisher.nickname,'publisher_avatar':str(msg.publisher.avatar),'created_time':msg.created_time.strftime('%Y-%m-%d %H:%M:%S'),'reply':[]})
#关联回复和留言
#判断留言id是否在留言回复里，如果在就证明有留言,就把数据存入到reply里
for m in msg_list:
if m['id'] in rep_dic:
m['reply'] = rep_dic[m['id']]
2把组装数据里设的控制不全：
res['data']['messages'] = msg_list
res['data']['messages_count'] = m_count
最后完整浏览一下代码：
class TopicViews(View):#组装文章详情页数据
def make_topic_res(self,author,author_topic,is_self):
#博主访问自己
if is_self:
#下一篇
next_topic = Topic.objects.filter(id__gt=author_topic.id,author=author).first()
#上一篇
last_topic = Topic.objects.filter(id__lt=author_topic.id,author=author).last()
else:
next_topic = Topic.objects.filter(id__gt=author_topic.id,author=author,limit='public').first()
last_topic = Topic.objects.filter(id__lt=author_topic.id,author=author,limit='public').last()
print('next_topic的值是：',next_topic)
#下一篇文章的id和title
next_id = next_topic.id if next_topic else None
next_title = next_topic.title if next_topic else ''
#上一篇文章的id和title
last_id = last_topic.id if last_topic else None
last_title = last_topic.title if last_topic else ''
#关联留言和回复
#查出当前文章的所有留言,相当于拿到了春游的原始数据
all_messages = Message.objects.filter(topic=author_topic).order_by('-created_time')
#准备一个数组存留言，准备一个字段存回复
[]
rep_dic = {}
m_count = 0
#判断身份
for msg in all_messages:
if msg.parent_message:
#回复
#初始化留言字典框架
rep_dic.setdefault(msg.parent_message,[])
rep_dic[msg.parent_message].append({'msg_id':msg.id,'publisher':msg.publisher.nickname,'publisher_avatr':str(msg.publisher.avatar),'content':msg.content,'created_time':msg.created_time.strftime('%Y-%m-%d %H:%M:%S')})
else:
#留言
#计数
msg_list.append({'id':msg.id,'content':msg.content,'publisher':msg.publisher.nickname,'publisher_avatar':str(msg.publisher.avatar),'created_time':msg.created_time.strftime('%Y-%m-%d %H:%M:%S'),'reply':[]})
#关联回复和留言
#判断留言id是否在留言回复里，如果在就证明有留言,就把数据存入到reply里
for m in msg_list:
if m['id'] in rep_dic:
m['reply'] = rep_dic[m['id']]
= {'code':200,'data':{}}
res['data']['nickname'] = author.nickname
res['data']['title'] = author_topic.title
res['data']['category'] = author_topic.category
res['data']['created_time'] = author_topic.create_time.strftime('%Y-%m-%d %H:%M:%S')
res['data']['content'] = author_topic.content
res['data']['introduce'] = author_topic.introduce
res['data']['author'] = author.username
res['data']['last_id'] = last_id
res['data']['last_title'] = last_title
res['data']['next_id'] = next_id
res['data']['next_title'] = next_title
res['data']['messages'] = msg_list'data']['messages_count'] = m_count
return
