Django设置默认的表单值

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()

我也有上面模型的模型表单如下:

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


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

我想知道如何设置坦克隐藏字段的默认值。下面是到目前为止显示/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/')
337572 次浏览

你可以使用Form.initial,这在在这里中解释。

你有两个选择,要么填充值时调用表单构造函数:

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

或者在表单定义中设置该值:

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

如果你从POST创建modelform,初始值可以这样分配:

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

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

其他解决方案:创建表单后设置初始值:

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

我有这个其他的解决方案(我张贴它以防其他人像我一样使用下面的方法从模型):

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',


})
}

首字母在__init__函数上定义为self.fields['is_active'].initial = False

我希望这能帮助到你:

form.instance.updatedby = form.cleaned_data['updatedby'] = request.user.id

正如Django文档中所解释的,initial不是default

  • 字段的最初的值将显示在HTML中。但是如果用户删除了这个值,并最终为这个字段返回一个空值,initial值将丢失。所以你不会得到默认的行为所期望的结果。

  • 默认的行为是:如果data参数不包含字段的任何值,验证过程将采用的值。

要实现这一点,一个简单的方法是将initialclean_<field>()结合起来:

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']

在开发过程中,我还遇到了在表单中设置默认值的需要。我的解决方案是

initial={"":""}
form=ArticleModel(request.POST)
if form.has_changed():
data = {i: form.cleaned_data[i] for i in form.changed_data}
data.update({key: val for key, val in init_praram.items() if key not in form.changed_data})


使用的形式。Has_changed,if form。字段,您可以使用此方法

我如何添加首字母到形式: I read @Sergey Golovchenko answer.

所以我只是将它添加到if request.method == 'POST':中的表单中。 但如果您想在发布表单之前查看它的值,则不能将它放在这里。 你需要把它放在else所在的形式

下面的例子来自< >强views.py < / >强

def myForm(request):
kontext = {}


if request.method == 'POST':
# You might want to use clean_data instead of initial here. I found something on a stack overflow question, and you add clean data to the Forms.py, if you want to change the post data. https://stackoverflow.com/questions/36711229/django-forms-clean-data
form = myModelForm(request.POST, initial={'user': request.user})
if form.is_valid():
form.save()
return redirect('/')
else:
# you need to put initial here, if you want to see the value before you post it
form = myModelForm(initial={'user': request.user})
kontext['form'] = form
return render(request, 'app1/my_form.html', kontext)