如何让Django的通用视图使用具有初始值的表单?

时间:2009-05-25 19:51:55

标签: python django forms

我知道如何从视图中为表单设置初始值。但是,如何让通用视图将初始值设置为表单?我可以为通用视图编写包装器视图,但我仍然无法访问表单对象实例化。

我想要实现的具体目标是让用户使用create_object泛型视图创建一个新对象。但是,我想将对象'us​​er'的字段设置为当前登录的用户,该用户只能以request.user身份访问。如何将表单初始化为具有此字段?

编辑:我遇到了__new__。这可以用一些默认参数调用它自己的构造函数吗?

非常感谢。

3 个答案:

答案 0 :(得分:4)

不幸的是,您无法通过Django的create_object通用视图实现此行为;你必须自己写。但是,这很简单。

首先,您必须创建一个新的表单类,如下所示:

from django import forms
class MyForm(forms.ModelForm):
    class Meta:
        model = MyModel  # model has a user field

然后你就可以创建一个这样的视图:

from django.shortcuts import render_to_response
from django.template import RequestContext
from django.http import HttpResponseRedirect
from django.contrib.auth.decorators import login_required

@login_required
def create_mymodel(request):
    if request.method == 'POST':
        # Get data from form
        form = MyForm(request.POST)
        # If the form is valid, create a new object and redirect to it.
        if form.is_valid():
            newObject = form.save()
            return HttpResponseRedirect(newObject.get_absolute_url())
    else:
        # Fill in the field with the current user by default
        form = MyForm(initial={'user': request.user})
    # Render our template
    return render_to_response('path/to/template.html',
        {'form': form},
        context_instance=RequestContext(request))

答案 1 :(得分:3)

您可以通过动态构建表单类并将其传递给通用视图,在通用视图包装器中执行此操作,但这种治疗方法可能比疾病更糟糕。只需编写自己的视图,然后急切等待this降落。

答案 2 :(得分:0)

如果您想要通用视图的所有功能,那么您可以使用原始模板创建新的通用视图。

例如:

def create_object_with_initial(request, model=None, template_name=None,
    template_loader=loader, extra_context=None, post_save_redirect=None,
    login_required=False, context_processors=None, form_class=None, initial=None):

if extra_context is None: extra_context = {}
if login_required and not request.user.is_authenticated():
    return redirect_to_login(request.path)

model, form_class = get_model_and_form_class(model, form_class)
if request.method == 'POST':
    form = form_class(request.POST, request.FILES)
    if form.is_valid():
        new_object = form.save()

        msg = ugettext("The %(verbose_name)s was created successfully.") %\
                                {"verbose_name": model._meta.verbose_name}
        messages.success(request, msg, fail_silently=True)
        return redirect(post_save_redirect, new_object)
else:
    print "creating", form_class, " with initial data ", initial
    form = form_class(initial=initial)

# Create the template, context, response
if not template_name:
    template_name = "%s/%s_form.html" % (model._meta.app_label, model._meta.object_name.lower())
t = template_loader.get_template(template_name)
c = RequestContext(request, {
    'form': form,
}, context_processors)
apply_extra_context(extra_context, c)
return HttpResponse(t.render(c))

这是从/site-packages/django/views/generic/create_update.py复制的,只有第3行和第21行更改为包含初始数据。

然后按照您的预期使用它:

object_info = {
'model': YourModel,
'initial': {'data' : 'Initial Value'},
'template_name': 'template.html'
}

url(r'^path/$',
    login_required(create_object_with_initial),
    object_info,
    name='url_name'),

这应该有效。