Django实战（4）：scaffold生成物分析

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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 hellourlpatterns = 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 filesfrom 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 = 1try: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。

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