DRF preparation

$$DR\; \&\; ltF.Quasiprepared$$

1. Installation of related libraries

pip install django  -i http://pypi.douban.com/simple/  --trusted-host pypi.douban.com

pip install djangorestframework -i http://pypi.douban.com/simple/  --trusted-host pypi.douban.com

# 跨域
pip install django-cors-headers   -i http://pypi.douban.com/simple/  --trusted-host pypi.douban.com

pip install pymysql -i http://pypi.douban.com/simple/  --trusted-host pypi.douban.com

2. Create a django project

django-admin startproject test_django_project

3. Use pycharm to open the test_django_project project

4. Complete some basic configuration

4.1 Database configuration

DATABASES = {
    
    
 'default': {
    
    
        # 数据库引擎（是mysql还是oracle等）
        'ENGINE': 'django.db.backends.mysql',
        # 数据库的名字
        'NAME': 'DjangoDB',
        # 连接mysql数据库的用户名
        'USER': 'root',
        # 连接mysql数据库的密码
        'PASSWORD': '123456',
        # mysql数据库的主机地址
        'HOST': '127.0.0.1',
        # mysql数据库的端口号
        'PORT': '3306',
  }
}

4.2 Time zone

TIME_ZONE = 'Asia/Shanghai'

4.3 Programming language

LANGUAGE_CODE = 'zh-CN'

4.4 Install rest_framework

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    
    'rest_framework'
]

5. DRF project infrastructure

6. Create app and model:

import pymysql
pymysql.install_as_MySQLdb()

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',

    'rest_framework',
    'apps.webauth',
]

Create the model:

from django.db import models

# Create your models here.
class Person(models.Model):
    name = models.CharField(max_length=100,null=False)
    address = models.CharField(max_length=100,null=False)

7. Add test data:

After creating the model, run makemigrationsand migratemap the model to the mysql database.

8. Write Serializers:

Create a new file serializers.py in the webauth app, and add the following code:

from rest_framework import serializers
from .models import Person

class PersonSerializer(serializers.ModelSerializer):
    class Meta:
        model = Person
        fields= "__all__"
        # exclude = ['','',]

9. Write the view:

Using drf, we can easily create views that contain methods such as get/post. Add the following code in meituan.views:

from rest_framework import viewsets
from .models import Person
from .serializers import PersonSerializer

# 这个视图函数已经包含了增删改查操作
class PersonViewset(viewsets.ModelViewSet):
    queryset = Person.objects.all()
    serializer_class = PersonSerializer

10. Write routing:

Add the following code in meituan.urls:

from rest_framework.routers import DefaultRouter
from .views import PersonViewset

router = DefaultRouter()
router.register('person',PersonViewset,basename='person')


app_name = 'drf_demo'
urlpatterns = []+router.urls

Then add the route of meituan in the project's urls.py:

from django.contrib import admin
from django.urls import path,include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('drf_demo/', include('apps.drf_demo.urls')),
]

In the future, we can use different methods to send requests to /meituan/merchant. For example, if you use get, it will return the list of merchants. For example, if you use post, you will add data to the merchant table.

---

django.db.utils.OperationalError: (1045, “Access denied for user ‘root’@‘117.136.67.229’ (using password: YES)”)
ALTER USER ‘root’@‘localhost’ IDENTIFIED WITH mysql_native_password BY ‘123456’;
FLUSH PRIVILEGES；