Django实战（4）：scaffold生成物分析

在 上一节用一个插件生成了类似rails的scaffold，其实无非就是URLconf+MTV。让我们看看具体都生成了哪些东西。
首先是“入口”的定义即URLconf，打开urls.py:
from django.conf.urls.defaults import patterns, include, url from depot.views import hello urlpatterns = patterns('', url(r'^hello/hello), ) urlpatterns += patterns ('', (r'^depotapp/', include('depotapp.urls')), )

上面的代码中增加的配置行表示：以depotapp开头的url由depotapp/urls.py文件进行处理。

django的url配置中，除了（正则表达式，view函数）的方式外，还支持（正则表达式，include文件）的方式。通常把app自身相关的url写到自己的url配置文件中，然后在project中引用。

接下来看一下生成的depotapp/urls.py的内容：

from django.conf.urls.defaults import * from models import * from views import * urlpatterns = patterns('', (r'product/create/$', create_product), (r'product/list/$', list_product ), (r'product/edit/(?P<id>[^/]+)/$', edit_product), (r'product/view/(?P<id>[^/]+)/$', view_product), ) 将CRU（没有D)的URL映射到了视图。而视图在depotapp/views.py中定义：

from django import forms from django.template import RequestContext from django.http import HttpResponse, HttpResponseRedirect from django.template.loader import get_template from django.core.paginator import Paginator from django.core.urlresolvers import reverse # app specific files from models import * from forms import * def create_product(request): form = ProductForm(request.POST or None) if form.is_valid(): form.save() form = ProductForm() t = get_template('depotapp/create_product.html') c = RequestContext(request,locals()) return HttpResponse(t.render(c)) def list_product(request): list_items = Product.objects.all() paginator = Paginator(list_items ,10) try: page = int(request.GET.get('page', '1')) except ValueError: page = 1 try: list_items = paginator.page(page) except : list_items = paginator.page(paginator.num_pages) t = get_template('depotapp/list_product.html') c = RequestContext(request,locals()) return HttpResponse(t.render(c)) def view_product(request, id): product_instance = Product.objects.get(id = id) t=get_template('depotapp/view_product.html') c=RequestContext(request,locals()) return HttpResponse(t.render(c)) def edit_product(request, id): product_instance = Product.objects.get(id=id) form = ProductForm(request.POST or None, instance = product_instance) if form.is_valid(): form.save() t=get_template('depotapp/edit_product.html') c=RequestContext(request,locals()) return HttpResponse(t.render(c))

视图中的相关内容比较多，主要的是模板，其次还有模型类、Paginator分页器、Form表单等等。

基本涵盖了典型的web应用交互的内容。