python - 将模型表单字段更改为文本输入小部件
问题描述
我想将“trans_recipient”字段小部件从下拉列表更改为文本输入字段。在大的情况下
我尝试了以下方法:
class SafeTransactionForm(forms.ModelForm):
''' SafeTranSactionForm '''
trans_recipient = forms.CharField(widget=forms.TextInput(attrs={'class': 'special'}))
class Meta:
model = SafeTransaction
fields = [ 'trans_recipient',
'subject',
'arbitrator_name',
'payment_condition',
'amount_to_pay']
这产生了这个:
虽然小部件本身已经改变,但实际上尝试使用它会产生一个值错误,如下所示:
没有我不正确的单行尝试更改小部件:
class SafeTransactionForm(forms.ModelForm):
''' SafeTranSactionForm '''
class Meta:
model = SafeTransaction
fields = [ 'trans_recipient',
'subject',
'arbitrator_name',
'payment_condition',
'amount_to_pay']
下拉列表:
我尝试过使用语法,尝试更新元类中的小部件,但我大多以语法错误告终,并且在一些谷歌搜索后我无法找到这种特定情况的示例。
非常欢迎和赞赏洞察力和解释。
编辑:
现在我收到一个错误:ValueError: invalid literal for int() with base 10: 'inbox'
更新视图类:
class SafeTransUpdateView(UpdateView):
'''
This view lets the user Update a SafeTransaction receipt
then send an automatic email to the email address
'''
form_class = SafeTransactionForm
model = SafeTransaction
template_name = "myInbox/safeTrans_update.html"
def __init__(self, *args, **kwargs):
self.request = kwargs.pop('request', None)
super(SafeTransUpdateView, self).__init__(*args, **kwargs)
def form_valid(self, form):
trans = form.save(commit=False)
trans.save()
### Send an email to the user upon transaction update.
usr_obj = User.objects.get(customuser=trans.trans_recipient)
user_mail = usr_obj.email
from_email = 'timi.ogunkeye@gmail.com'
contents = "This transaction [ " +trans.payment_condition+" ] has been updated !"
email_subject = 'Transaction Update !'
try:
send_mail(email_subject, contents, from_email, [user_mail], fail_silently=False)
pass
except:
pass
else:
pass
return HttpResponseRedirect('inbox')
我更新的表格:
class SafeTransactionForm(forms.ModelForm):
''' SafeTranSactionForm '''
# trans_recipient = forms.CharField(widget=forms.TextInput(attrs={'class':'special'}))
trans_recipient = forms.ModelChoiceField(queryset=CustomUser.objects.all(),
widget=forms.TextInput(attrs={'value':"username"}), to_field_name="username")
def clean_trans_recipient(self):
data = self.cleaned_data['trans_recipient']
try:
return CustomUser.objects.get(username=data)
except CustomUser.DoesNotExist:
raise forms.ValidationError("No user with this username exists")
class Meta:
model = SafeTransaction
fields = [ 'trans_recipient',
'trans_recipient_email',
'subject',
'arbitrator_name',
'payment_condition',
'amount_to_pay']
safeTrans_update.html :
<h1>TRANSACTION UPDATE: </h1>
<form action="{% url 'ST_update' object.pk %}" method="post">{% csrf_token %}
{{ form.as_p }}
<input type="submit" value="Confirm Update" />
</form>
网址.py:
path('ST_update/<pk>',SafeTransUpdateView.as_view(),name='ST_update'),
我想知道为什么现在会发生此错误: ValueError: invalid literal for int() with base 10: 'inbox' 。任何信息都非常感谢。
解决方案
问题是 Django 不知道如何将表单字段中的数据转换回trans_recipient
模型的属性(应该是一个CustomUser
实例)。
然而这不是问题:您可以执行表单清理,从而编写自定义函数将字符串转换回CustomUser
对象,例如:
class SafeTransactionForm(forms.ModelForm):
''' SafeTranSactionForm '''
trans_recipient = forms.CharField(widget=forms.TextInput(attrs={'class': 'special'}))
def clean_trans_recipient(self):
data = self.cleaned_data['recipients']
try:
return CustomUser.objects.get(username=data)
except CustomerUser.DoesNotExist:
raise forms.ValidationError("No user with this username exists")
class Meta:
model = SafeTransaction
fields = [ 'trans_recipient', 'subject', 'arbitrator_name',
'payment_condition', 'amount_to_pay' ]
尽管您可能需要对CustomUser
fetch 进行一些调整。因此,我们的目标是获取CustomUser
并返回它。如果不CustomUser
存在这样的情况,那么我们提出一个ValidationError
.
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