How to access the HttpRequest object in Django forms（ Django view 给 forms 传递数据）

卓越笔记

发布于 2023-02-18 14:48:22

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Example 1：

PASSING THE REQUEST OBJECT TO THE FORM

In your view, when you create a form instance, pass the request object as a parameter. Here I used a parameter named request.

form = MyForm(request.POST, request.FILES, request=request)

ACCESSING THE REQUEST OBJECT IN THE FORM

In your form, use the __init__ method to assign the request object to a variable. Here I used self.request.

class MyForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        self.request = kwargs.pop('request', None)
        super(MyForm, self).__init__(*args, **kwargs)

FORM VALIDATION

Now we can use the self.request variable to access the request object inside of our form methods.

In the following example, I used the self.request variable to check if the name of the currently logged user is different from the value of the ‘name’ field.

class MyForm(forms.ModelForm):
    # Use self.request in your field validation
    def clean_name(self):
        if self.cleaned_data['name'] != self.request.user.name:
            raise forms.ValidationError("The name is not the same.")
        return self.cleaned_data['name']

Example 2：

As ars and Diarmuid have pointed out, you can pass request.user into your form, and use it in validating the email. Diarmuid's code, however, is wrong. The code should actually read:

from django import forms

class UserForm(forms.Form):
    email_address = forms.EmailField(widget = forms.TextInput(attrs = {'class':'required'}))

    def __init__(self, *args, **kwargs):
        self.user = kwargs.pop('user', None)
        super(UserForm, self).__init__(*args, **kwargs)

    def clean_email_address(self):
        email = self.cleaned_data.get('email_address')
        if self.user and self.user.email == email:
            return email
        if UserProfile.objects.filter(email=email).count():
            raise forms.ValidationError(u'That email address already exists.')
        return email

Then, in your view, you can use it like so:

def someview(request):
    if request.method == 'POST':
        form = UserForm(request.POST, user=request.user)
        if form.is_valid():
            # Do something with the data
            pass
    else:
        form = UserForm(user=request.user)
    # Rest of your view follows