如何让Django的通用视图使用具有初始值的窗体？ [英] How to let Django's generic view use a form with initial values?

问题描述

我知道如何从视图中将初始值设置为窗体。但是，如何让一般的视图将初始值设置为一个窗体呢？我可以为通用视图写一个包装器视图，但是我仍然无法访问表单对象实例化。

我要实现的具体目标是拥有用户使用create_object泛型视图创建新对象。但是，我想将对象user的字段设置为当前登录的用户，该用户只能以request.user方式访问。如何将表单初始化为具有此字段？

编辑：我遇到__new__。可以使用一些默认参数调用自己的构造函数吗？

非常感谢。

解决方案>

不幸的是，您不能通过Django的 create_object 通用视图来实现此行为。你必须自己写。但是，这很简单。

要开始，您必须创建一个新的表单类，如下所示：

 从django import forms 
 class MyForm（forms.ModelForm）：
 class Meta：
 model = MyModel＃model有一个用户字段
  

然后你可以创建一个这样的视图：

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

@login_required
def create_mymodel（request）：
如果request.method =='POST'：
＃从表单
获取数据= MyForm（request.POST）
＃如果表单有效，请创建一个新对象并重定向到该对象。
如果form.is_valid（）：
newObject = form.save（）
返回HttpResponseRedirect（newObject.get_absolute_url（））
else：
＃填写字段与当前用户默认
form = MyForm（initial = {'user'：request.user}）
＃渲染我们的模板
返回render_to_response（'path / to / template.html' ，
{'form'：form}，
context_instance = RequestContext（request））

I know how to set initial values to a form from the view. But how do I go about letting a generic view set initial values to a form? I can write a wrapper view for the generic view, but I still have no access to the form object instantiation.

The specific goal I'm trying to achieve is to have a user create a new object, using the create_object generic view. However, I'd like to set a field of the object 'user' to the currently logged in user, which is only accessible as request.user. How can the form be initialized to have this field?

Edit: I came across __new__. Could this call its own constructor with some default arguments?

Many thanks.

解决方案

Unfortunately, you cannot achieve this behavior through Django's create_object generic view; you will have to write your own. However, this is rather simple.

To start off, you must create a new form class, like this:

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

Then you would be able to create a view like this:

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))

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