[Flutter ][译] FLUTTER + DJANGO APP (1. DJANGO)

此文来自这位 youtuber BK Codes 的内容；但其实也不算翻译，因为他的印度口音我还真的完全对不上频率!! 因此主要为以我为小白角度将 code 上注解，若有误解之处欢迎各位读着更正赐教。
第一篇为 Django 部分，记得先额外安装好 rest_framework!(第二篇 FLUTTER 部分)

建立起名为 todo_app 的 DJANGO 後端资料库，并加入 apis、todos 的 app，资料结构如下:

todo_app
    |_ apis
    |_ todo_app
    |_ todos

todo_app/todo_app/settings.py

ALLOWED_HOSTS = [
	'10.0.2.2', # for Android emulator
    'localhost'
]
INSTALLED_APPS = [
    ...
    'apis.apps.ApisConfig',
    'rest_framework',
    'todos.apps.TodosConfig'
]
REST_FRAMEWORK = { # rest_framework 权限无需认证，无脑全开
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework.permissions.AllowAny',
    ]
}

todo_app/todo_app/uls.py

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

urlpatterns = [
    path('admin/', admin.site.urls),
    path('apis/v1/', include('apis.urls')), # 开路给 apis/uls.py
]

todo_app/todos/models.py

from django.db import models
# 给 flutter listview 的 title / subtitle
class Todo(models.Model):
    title = models.CharField(max_length=200)
    description = models.TextField()
    def __str__(self):
        return self.title

todo_app/apis/serializers.py

from rest_framework import serializers
from todos import models

class TodoSerializer(serializers.ModelSerializer):
    class Meta:
        fields = (
            'id', # 给 flutter 指定资料库资料
            'title',
            'description'
        )
        model = models.Todo

todo_app/apis/urls.py

from django.urls import path
from .views import ListTodo, DetailTodo
urlpatterns = [
    path('', ListTodo.as_view()),
    path('<int:pk>/', DetailTodo.as_view())
]

todo_app/apis/views.py

from django.shortcuts import render
from rest_framework import generics
from todos import models
from .serializers import TodoSerializer

class ListTodo(generics.ListCreateAPIView):
    queryset = models.Todo.objects.all() # 指定数据对象查询集
    serializer_class = TodoSerializer # 指定序列化器

class DetailTodo(generics.RetrieveUpdateDestroyAPIView):
    queryset = models.Todo.objects.all()
    serializer_class = TodoSerializer
]
# rest-framework 把操作都包装好好，指定好名称便可
# 'ListCreateAPIView': get、post
# 'RetrieveUpdateDestroyAPIView': get、put、patch、delete 
# https://www.django-rest-framework.org/api-guide/generic-views/