• 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。

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  • 原文地址:https://www.cnblogs.com/wuxl360/p/5787777.html
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