Django实战(4):scaffold生成物分析

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[^/]+)/$', edit_product),
    (r'product/view/(?P[^/]+)/$', 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。

posted on 2016-08-19 15:24  邬兴亮  阅读(411)  评论(0编辑  收藏  举报

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