以Django格式访问POST数据

I have been using this site as an example of how to make a dynamic form in Django. In his view he uses

我一直在使用这个站点作为如何在Django中创建动态表单的示例。在他看来他使用

if request.method == 'POST':
    form = UserCreationForm(request.POST)

to pass the data into the form and in the form constructor he uses

将数据传递到表单和他使用的表单构造函数中

extra = kwargs.pop('extra')

to access the POST data. I tried to do something similar with my view:

访问POST数据。我尝试用我的观点做类似的事情：

def custom_report(request):
    if request.method=='POST':
        form=CustomQueryConstraintForm(request.POST)
    else:
        form=CustomQueryConstraintForm()
    return render(request, 'frontend/custom_report.html', {'form':form})

In my form constructor I printed args and kwargs and found that kwargs is empty and args is a tuple containing the QueryDict that in turn contains the POST data. If I try instead to use form=CustomQueryConstraintForm(**request.POST), each element in kwargs is a list containing the value of the field as its only element. Am I doing something wrong here? If not, is there a more elegant way of accessing the data than args[0][element_name][0]?

在我的表单构造函数中，我打印了args和kwargs，发现kwargs是空的，args是一个包含QueryDict的元组，而QueryDict又包含POST数据。如果我尝试使用form = CustomQueryConstraintForm（** request.POST），kwargs中的每个元素都是一个包含字段值作为唯一元素的列表。我在这里做错了吗？如果没有，是否有比args [0] [element_name] [0]更优雅的方式来访问数据？

3 个解决方案

#1

That is expected behavior for forms: the POST data you pass into the form is the first argument, args[0] and not a keyword argument. What are you looking for?

这是表单的预期行为：传递给表单的POST数据是第一个参数args [0]而不是关键字参数。你在找什么？

data = args[0]
print data['my_field']

and in the form constructor he uses extra = kwargs.pop('extra') to access the POST data.

并在表单构造函数中，他使用extra = kwargs.pop（'extra'）来访问POST数据。

kwargs.pop('extra') is not getting POST data. It is a list of questions associated with that given user -- some scenario given by the author that the "marketing department" handed you.

kwargs.pop（'extra'）没有获取POST数据。这是与给定用户相关的问题列表 - 作者给出了“营销部门”递给您的一些情况。

In any case, if you need to access the post data at any point in a form, I find self.data the cleanest which is set in forms.__init__.

无论如何，如果你需要在表单中的任何一点访问帖子数据，我发现self.data是表格中设置的最干净的.__ init__。

class MyForm(forms.Form):
    def __init__(self, *args, **kwargs):
        super(MyForm, self).__init__(*args, **kwargs)
        self.data['my_field']

#2

If I understand correctltly, after a POST request you are trying to redisplay the same form page in which the form fields are filled, right? If yes, this is what you need:

如果我理解正确，在POST请求之后你试图重新显示填写表单字段的相同表单页面，对吗？如果是，这就是您所需要的：

form = CustomQueryConstraintForm(initial=request.POST)

#3

You can also access the form data through the cleaned_data dictionary after using the is_valid() method. Like this:

您还可以在使用is_valid（）方法后通过cleaning_data字典访问表单数据。喜欢这个：

jobForm = JobForm(request.POST)
jobForm.is_valid()
jobForm.cleaned_data

it's a dictionary of the values that have been entered into the form.

它是已输入表单的值的字典。

#1