Django设置默认表单值

Question

我有一个模型如下.

class TankJournal(models.Model):
    user = models.ForeignKey(User)
    tank = models.ForeignKey(TankProfile)
    ts = models.IntegerField(max_length=15)
    title = models.CharField(max_length=50)
    body = models.TextField()

我还有一个上述模型的模型表格如下.

class JournalForm(ModelForm):
    tank = forms.IntegerField(widget=forms.HiddenInput()) 

    class Meta:
        model = TankJournal
        exclude = ('user','ts')

我想知道如何设置该坦克隐藏字段的默认值.这是我到目前为止显示/保存表单的函数

def addJournal(request, id=0):
    if not request.user.is_authenticated():
        return HttpResponseRedirect('/')

    # checking if they own the tank
    from django.contrib.auth.models import User
    user = User.objects.get(pk=request.session['id'])

    if request.method == 'POST':
        form = JournalForm(request.POST)
        if form.is_valid():
            obj = form.save(commit=False)

            # setting the user and ts
            from time import time
            obj.ts = int(time())
            obj.user = user

            obj.tank = TankProfile.objects.get(pk=form.cleaned_data['tank_id'])

            # saving the test
            obj.save()

    else:
        form = JournalForm()

    try:
        tank = TankProfile.objects.get(user=user, id=id)
    except TankProfile.DoesNotExist:
        return HttpResponseRedirect('/error/')

谢谢.

Answer 1

您可以使用此处说明的初始值

调用表单构造函数时,有两个选项可以填充值:

form = JournalForm(initial={'tank': 123})

或者在表单定义中设置值:

tank = forms.IntegerField(widget=forms.HiddenInput(), initial=123) 

Answer 2

其他解决方案:创建表单后设置初始值:

form.fields['tank'].initial = 123

Answer 3

如果从POST值创建modelform,则可以通过以下方式分配initial:

form = SomeModelForm(request.POST, initial={"option": "10"})

https://docs.djangoproject.com/en/1.10/topics/forms/modelforms/#providing-initial-values

Answer 4

我有另外一个解决方案(我发布它以防万一其他人,因为我使用模型中的以下方法):

class onlyUserIsActiveField(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(onlyUserIsActiveField, self).__init__(*args, **kwargs)
        self.fields['is_active'].initial = False

    class Meta:
        model = User
        fields = ['is_active']
        labels = {'is_active': 'Is Active'}
        widgets = {
            'is_active': forms.CheckboxInput( attrs={
                            'class':          'form-control bootstrap-switch',
                            'data-size':      'mini',
                            'data-on-color':  'success',
                            'data-on-text':   'Active',
                            'data-off-color': 'danger',
                            'data-off-text':  'Inactive',
                            'name':           'is_active',

            })
        }

最初的定义是__init__函数asself.fields['is_active'].initial = False

Answer 5

正如Django 文档中所解释的，initial不是default.

• 字段的初始值旨在显示在 HTML 中。但是如果用户删除了这个值，最后为这个字段发回一个空值，这个initial值就丢失了。因此，您无法获得默认行为所期望的结果。

• 该默认行为是：如果值验证过程将采取data说法不包含字段的任何值。

要实现这一点，一个简单的方法是结合initial和clean_<field>()：

class JournalForm(ModelForm):
    tank = forms.IntegerField(widget=forms.HiddenInput(), initial=123) 

    (...)

    def clean_tank(self):
        if not self['tank'].html_name in self.data:
            return self.fields['tank'].initial
        return self.cleaned_data['tank']