대규모 프로젝트에서 Django 프레임워크 적용 실습

#模型层
from django.db import models

class Author(models.Model):
    name = models.CharField(max_length=100)

class Book(models.Model):
    title = models.CharField(max_length=200)
    author = models.ForeignKey(Author, on_delete=models.CASCADE)

#视图层
from django.views.generic import ListView
from .models import Book

class BookListView(ListView):
    model = Book
    template_name = 'book_list.html'

#表单层
from django import forms
from .models import Book

class BookForm(forms.ModelForm):

    class Meta:
        model = Book
        fields = ['title', 'author']

#模板缓存
{% cache 500 "book_list" %}
    <ul>
    {% for book in book_list %}
        <li>{{ book.title }} - {{ book.author.name }}</li>
    {% endfor %}
    </ul>
{% endcache %}

#查询缓存
from django.core.cache import cache
from .models import Book

def get_book_list():
    key = 'book_list'
    book_list = cache.get(key)
    if book_list is None:
        book_list = Book.objects.all()
        cache.set(key, book_list, 300)
    return book_list

#优化查询
from django.db.models import Count
from .models import Book, Author

author_list = Author.objects.annotate(book_count=Count('book')).order_by('-book_count')

#Celery
from celery import Celery
from django.core.mail import send_mail

app = Celery('tasks', broker='amqp://guest@localhost//')

@app.task
def send_email_task():
    send_mail('Subject', 'Body', 'from@example.com', ['to@example.com'])

#Dramatiq
import dramatiq
from django.core.mail import send_mail

@dramatiq.actor
def send_email_task():
    send_mail('Subject', 'Body', 'from@example.com', ['to@example.com'])

#设计模式
from django.urls import reverse_lazy
from django.views.generic import CreateView
from .forms import BookForm

class BookCreateView(CreateView):
    model = Book
    form_class = BookForm
    success_url = reverse_lazy('book_list')
    template_name = 'book_form.html'

#PEP 8代码风格指南
from django.shortcuts import render
from django.http import HttpResponse

def my_view(request):
    if request.method == 'GET':
        return render(request, 'my_template.html')
    elif request.method == 'POST':
        return HttpResponse('Hello, World!')