Django 如何在ModelForm中创建RadioSelect非下颌和删除默认选项？

编辑我的问题与可能的重复问题不同的原因是，这并没有解决使其非重复的问题 manditory同时删除默认选项“-----”

我想在

forms.ModelForm

要使用

RadioSelect

，我将在我的

ModelForm

（以下）中添加小部件，因为Djangos模型不提供

RadioSelect

或

Select

小部件

执行此操作的标准方法是将

Blank=True

作为参数传递。然而，当我在另一个问题中发现时，我问道

我必须删除默认选项“-----”

那么，如何使RadioSelect问题成为非强制性问题，同时不包括默认选项“----”？

谢谢

forms.py

class SurveyFormB(forms.ModelForm): 

    class Meta:
        model = Person
        fields = ['internet_usage', 'smart_phone_ownership', 'smart_phone_usage']        

        widgets = {'internet_usage' : forms.RadioSelect,
                   'smart_phone_ownership' : forms.Select,
                   'smart_phone_usage' : forms.RadioSelect,
                   }

#How often do you use the Internet?  
INTERNET_LESS_THAN_ONE_HOUR_A_DAY = 'Less than one hour per day'
INTERNET_ONE_TO_TWO_HOURS_A_DAY = '1 - 2 hours per day'
INTERNET_TWO_TO_FOUR_HOURS_A_DAY = '2 - 4 hours per day'
INTERNET_FOUR_TO_SIX_HOURS_A_DAY = '4 - 6 hours per day'
INTERNET_SIX_TO_EIGHT_HOURS_A_DAY = '6 - 8 hours per day'
INTERNET_EIGHT_PLUS_HOURS_A_DAY = '8 + hours per day'

INTERNET_USAGE = (
    (INTERNET_LESS_THAN_ONE_HOUR_A_DAY, 'Less than one hour a day'),
    (INTERNET_ONE_TO_TWO_HOURS_A_DAY, '1 - 2 hours a day'),
    (INTERNET_TWO_TO_FOUR_HOURS_A_DAY, '2 - 4 hours a day'),
    (INTERNET_FOUR_TO_SIX_HOURS_A_DAY, '4 - 6 hours a Day'),
    (INTERNET_SIX_TO_EIGHT_HOURS_A_DAY, '6 - 8 hours a day'),
    (INTERNET_EIGHT_PLUS_HOURS_A_DAY, '8 + hours a day'),
           )

internet_usage = models.CharField(null=True, max_length=100, default=None, choices=INTERNET_USAGE, verbose_name='How long do you spend on the Internet each day?')

from itertools import chain
from django.forms import RadioSelect
from django.utils.encoding import force_unicode

class RadioSelectNotNull(RadioSelect):

    def get_renderer(self, name, value, attrs=None, choices=()):
        """Returns an instance of the renderer."""
        if value is None: value = ''
        str_value = force_unicode(value) # Normalize to string.
        final_attrs = self.build_attrs(attrs)
        choices = list(chain(self.choices, choices))
        if choices[0][0] == '':
            choices.pop(0)
        return self.renderer(name, str_value, final_attrs, choices)


class SurveyFormB(forms.ModelForm): 

    class Meta:
        model = Person
        fields = ['internet_usage', 'smart_phone_ownership', 'smart_phone_usage']        

        widgets = {'internet_usage' : RadioSelectNotNull,
                   'smart_phone_ownership' : forms.Select,
                   'smart_phone_usage' : RadioSelectNotNull,
                   }

INTERNET_USAGE = (
    ("One", 'Less than one hour a day'),
    ( "Two", '1 - 2 hours a day'),
    ( "Three", '2 - 4 hours a day'),
    ( "Four", '4 - 6 hours a Day'),
    ( "Five", '6 - 8 hours a day'),
    ( "Six", '8 + hours a day'),
)

internet_usage = models.CharField(null=True, max_length=100, default=None, choices=INTERNET_USAGE, verbose_name='How long do you spend on the Internet each day?')

型号.py

class SurveyFormB(forms.ModelForm): 

    class Meta:
        model = Person
        fields = ['internet_usage', 'smart_phone_ownership', 'smart_phone_usage']        

        widgets = {'internet_usage' : forms.RadioSelect,
                   'smart_phone_ownership' : forms.Select,
                   'smart_phone_usage' : forms.RadioSelect,
                   }

#How often do you use the Internet?  
INTERNET_LESS_THAN_ONE_HOUR_A_DAY = 'Less than one hour per day'
INTERNET_ONE_TO_TWO_HOURS_A_DAY = '1 - 2 hours per day'
INTERNET_TWO_TO_FOUR_HOURS_A_DAY = '2 - 4 hours per day'
INTERNET_FOUR_TO_SIX_HOURS_A_DAY = '4 - 6 hours per day'
INTERNET_SIX_TO_EIGHT_HOURS_A_DAY = '6 - 8 hours per day'
INTERNET_EIGHT_PLUS_HOURS_A_DAY = '8 + hours per day'

INTERNET_USAGE = (
    (INTERNET_LESS_THAN_ONE_HOUR_A_DAY, 'Less than one hour a day'),
    (INTERNET_ONE_TO_TWO_HOURS_A_DAY, '1 - 2 hours a day'),
    (INTERNET_TWO_TO_FOUR_HOURS_A_DAY, '2 - 4 hours a day'),
    (INTERNET_FOUR_TO_SIX_HOURS_A_DAY, '4 - 6 hours a Day'),
    (INTERNET_SIX_TO_EIGHT_HOURS_A_DAY, '6 - 8 hours a day'),
    (INTERNET_EIGHT_PLUS_HOURS_A_DAY, '8 + hours a day'),
           )

internet_usage = models.CharField(null=True, max_length=100, default=None, choices=INTERNET_USAGE, verbose_name='How long do you spend on the Internet each day?')

from itertools import chain
from django.forms import RadioSelect
from django.utils.encoding import force_unicode

class RadioSelectNotNull(RadioSelect):

    def get_renderer(self, name, value, attrs=None, choices=()):
        """Returns an instance of the renderer."""
        if value is None: value = ''
        str_value = force_unicode(value) # Normalize to string.
        final_attrs = self.build_attrs(attrs)
        choices = list(chain(self.choices, choices))
        if choices[0][0] == '':
            choices.pop(0)
        return self.renderer(name, str_value, final_attrs, choices)


class SurveyFormB(forms.ModelForm): 

    class Meta:
        model = Person
        fields = ['internet_usage', 'smart_phone_ownership', 'smart_phone_usage']        

        widgets = {'internet_usage' : RadioSelectNotNull,
                   'smart_phone_ownership' : forms.Select,
                   'smart_phone_usage' : RadioSelectNotNull,
                   }

INTERNET_USAGE = (
    ("One", 'Less than one hour a day'),
    ( "Two", '1 - 2 hours a day'),
    ( "Three", '2 - 4 hours a day'),
    ( "Four", '4 - 6 hours a Day'),
    ( "Five", '6 - 8 hours a day'),
    ( "Six", '8 + hours a day'),
)

internet_usage = models.CharField(null=True, max_length=100, default=None, choices=INTERNET_USAGE, verbose_name='How long do you spend on the Internet each day?')

考虑以下答案并使用

RadioSelectNotNull

：

forms.py

class SurveyFormB(forms.ModelForm): 

    class Meta:
        model = Person
        fields = ['internet_usage', 'smart_phone_ownership', 'smart_phone_usage']        

        widgets = {'internet_usage' : forms.RadioSelect,
                   'smart_phone_ownership' : forms.Select,
                   'smart_phone_usage' : forms.RadioSelect,
                   }

#How often do you use the Internet?  
INTERNET_LESS_THAN_ONE_HOUR_A_DAY = 'Less than one hour per day'
INTERNET_ONE_TO_TWO_HOURS_A_DAY = '1 - 2 hours per day'
INTERNET_TWO_TO_FOUR_HOURS_A_DAY = '2 - 4 hours per day'
INTERNET_FOUR_TO_SIX_HOURS_A_DAY = '4 - 6 hours per day'
INTERNET_SIX_TO_EIGHT_HOURS_A_DAY = '6 - 8 hours per day'
INTERNET_EIGHT_PLUS_HOURS_A_DAY = '8 + hours per day'

INTERNET_USAGE = (
    (INTERNET_LESS_THAN_ONE_HOUR_A_DAY, 'Less than one hour a day'),
    (INTERNET_ONE_TO_TWO_HOURS_A_DAY, '1 - 2 hours a day'),
    (INTERNET_TWO_TO_FOUR_HOURS_A_DAY, '2 - 4 hours a day'),
    (INTERNET_FOUR_TO_SIX_HOURS_A_DAY, '4 - 6 hours a Day'),
    (INTERNET_SIX_TO_EIGHT_HOURS_A_DAY, '6 - 8 hours a day'),
    (INTERNET_EIGHT_PLUS_HOURS_A_DAY, '8 + hours a day'),
           )

internet_usage = models.CharField(null=True, max_length=100, default=None, choices=INTERNET_USAGE, verbose_name='How long do you spend on the Internet each day?')

from itertools import chain
from django.forms import RadioSelect
from django.utils.encoding import force_unicode

class RadioSelectNotNull(RadioSelect):

    def get_renderer(self, name, value, attrs=None, choices=()):
        """Returns an instance of the renderer."""
        if value is None: value = ''
        str_value = force_unicode(value) # Normalize to string.
        final_attrs = self.build_attrs(attrs)
        choices = list(chain(self.choices, choices))
        if choices[0][0] == '':
            choices.pop(0)
        return self.renderer(name, str_value, final_attrs, choices)


class SurveyFormB(forms.ModelForm): 

    class Meta:
        model = Person
        fields = ['internet_usage', 'smart_phone_ownership', 'smart_phone_usage']        

        widgets = {'internet_usage' : RadioSelectNotNull,
                   'smart_phone_ownership' : forms.Select,
                   'smart_phone_usage' : RadioSelectNotNull,
                   }

INTERNET_USAGE = (
    ("One", 'Less than one hour a day'),
    ( "Two", '1 - 2 hours a day'),
    ( "Three", '2 - 4 hours a day'),
    ( "Four", '4 - 6 hours a Day'),
    ( "Five", '6 - 8 hours a day'),
    ( "Six", '8 + hours a day'),
)

internet_usage = models.CharField(null=True, max_length=100, default=None, choices=INTERNET_USAGE, verbose_name='How long do you spend on the Internet each day?')

请注意，如果您还可以将“选项”字段修改为：

型号.py

class SurveyFormB(forms.ModelForm): 

    class Meta:
        model = Person
        fields = ['internet_usage', 'smart_phone_ownership', 'smart_phone_usage']        

        widgets = {'internet_usage' : forms.RadioSelect,
                   'smart_phone_ownership' : forms.Select,
                   'smart_phone_usage' : forms.RadioSelect,
                   }

#How often do you use the Internet?  
INTERNET_LESS_THAN_ONE_HOUR_A_DAY = 'Less than one hour per day'
INTERNET_ONE_TO_TWO_HOURS_A_DAY = '1 - 2 hours per day'
INTERNET_TWO_TO_FOUR_HOURS_A_DAY = '2 - 4 hours per day'
INTERNET_FOUR_TO_SIX_HOURS_A_DAY = '4 - 6 hours per day'
INTERNET_SIX_TO_EIGHT_HOURS_A_DAY = '6 - 8 hours per day'
INTERNET_EIGHT_PLUS_HOURS_A_DAY = '8 + hours per day'

INTERNET_USAGE = (
    (INTERNET_LESS_THAN_ONE_HOUR_A_DAY, 'Less than one hour a day'),
    (INTERNET_ONE_TO_TWO_HOURS_A_DAY, '1 - 2 hours a day'),
    (INTERNET_TWO_TO_FOUR_HOURS_A_DAY, '2 - 4 hours a day'),
    (INTERNET_FOUR_TO_SIX_HOURS_A_DAY, '4 - 6 hours a Day'),
    (INTERNET_SIX_TO_EIGHT_HOURS_A_DAY, '6 - 8 hours a day'),
    (INTERNET_EIGHT_PLUS_HOURS_A_DAY, '8 + hours a day'),
           )

internet_usage = models.CharField(null=True, max_length=100, default=None, choices=INTERNET_USAGE, verbose_name='How long do you spend on the Internet each day?')

from itertools import chain
from django.forms import RadioSelect
from django.utils.encoding import force_unicode

class RadioSelectNotNull(RadioSelect):

    def get_renderer(self, name, value, attrs=None, choices=()):
        """Returns an instance of the renderer."""
        if value is None: value = ''
        str_value = force_unicode(value) # Normalize to string.
        final_attrs = self.build_attrs(attrs)
        choices = list(chain(self.choices, choices))
        if choices[0][0] == '':
            choices.pop(0)
        return self.renderer(name, str_value, final_attrs, choices)


class SurveyFormB(forms.ModelForm): 

    class Meta:
        model = Person
        fields = ['internet_usage', 'smart_phone_ownership', 'smart_phone_usage']        

        widgets = {'internet_usage' : RadioSelectNotNull,
                   'smart_phone_ownership' : forms.Select,
                   'smart_phone_usage' : RadioSelectNotNull,
                   }

INTERNET_USAGE = (
    ("One", 'Less than one hour a day'),
    ( "Two", '1 - 2 hours a day'),
    ( "Three", '2 - 4 hours a day'),
    ( "Four", '4 - 6 hours a Day'),
    ( "Five", '6 - 8 hours a day'),
    ( "Six", '8 + hours a day'),
)

internet_usage = models.CharField(null=True, max_length=100, default=None, choices=INTERNET_USAGE, verbose_name='How long do you spend on the Internet each day?')

---

值得深思的是，你创造选择的方式

互联网使用

并不理想。首先，元组具有相同的值，并且仍然定义了两次字符串，而且

每个元组中的第一个元素是要在模型上设置的实际值，第二个元素是人类可读的名称。

谢谢，我一直在努力改进这一点。我不是100%确定你的意思，你能举一个一行的例子吗？当然，你可以这样想：

internetusage=（“一”、“一天不到一小时”）、（“两”、“一天1-2小时”）、（“三”、“一天2-4小时”）、…

现在当你得到

one的值时，它意味着第一个，
Two
second选项已选中，依此类推。因此，使用此解决方案，我可以删除前几行，例如
INTERNET\u少于一小时\u一天='少于一小时'
？这将大大减少我的代码。你能展示一下你添加的内容吗，那是不起作用的？因为它可以添加到任何地方，但只能确保，
widgets={'internetu\u用法]：forms.RadioSelect，
更改为
widgets={'internetu用法]：RadioSelectNotNull，
确保具有正确的导入语句