如何使用Django MultipleChoiceField ModelForm保存ModelForm数据

Question

我正在尝试从具有ModelForm的MultipleChoiceFields中保存数据。我希望用户能够选择多个timeframes并将数据保存到数据库中。

到目前为止，在使用MultipleChoiceField提交表单时，我没有得到任何返回。

这是我的models.py：

class InfoFormModel(models.Model):
    YES_NO = (
        ('yes', 'Yes'),
        ('no', 'No'),
    )
    TIMEFRAME = (
        ('1_weeks', '1 Week'),
        ('2_weeks', '2 Weeks'),
        ('3_weeks', '3 Weeks'),
        ('4_weeks_plus', '4 Weeks+'),
    )
    PAGES_NEEDED = (
        ('about_page', 'About Page'),
        ('contact_page', 'Contact Page'),
        ('blog_page', 'Blog Page'),
        ('map_page', 'Map Page'),
        ('ecommerce_page', 'Ecommerce Page'),
    )
    brand_name = models.CharField(
        blank=False, null=False, max_length=500, default='')
    logo = models.CharField(choices=YES_NO, blank=False,
                            null=False, max_length=500, default='no')
    what_is_the_service = models.TextField(
        blank=False, null=False, max_length=5000, default='')
    contact_number = models.BigIntegerField(blank=True, null=True, default='')
    email = models.EmailField(blank=True, null=True,
                              max_length=300, default='')
    timeframe = models.CharField(
        choices=TIMEFRAME, max_length=100, blank=False, null=False, default='')
    aim = models.TextField(blank=False, null=False,
                           max_length=5000, default='')
    products_product_images = models.CharField(
        choices=YES_NO, blank=False, max_length=500, null=False, default='')
    products_info = models.CharField(
        choices=YES_NO, blank=False, null=False, max_length=500, default='')
    pages_needed = models.CharField(
        choices=PAGES_NEEDED, blank=True, null=True, max_length=500, default='')

    def __str__(self):
        return self.brand_name

forms.py：

class InfoForm(forms.ModelForm):
    YES_NO = (
        ('yes', 'Yes'),
        ('no', 'No'),
    )
    TIMEFRAME = (
        ('1_weeks', '1 Week'),
        ('2_weeks', '2 Weeks'),
        ('3_weeks', '3 Weeks'),
        ('4_weeks_plus', '4 Weeks+'),
    )
    PAGES_NEEDED = (
        ('about_page', 'About Page'),
        ('contact_page', 'Contact Page'),
        ('blog_page', 'Blog Page'),
        ('map_page', 'Map Page'),
        ('ecommerce_page', 'Ecommerce Page'),
    )
    brand_name = forms.CharField(label='', widget=forms.TextInput(attrs={'placeholder' : 'Business/Brand Name?'}))
    logo = forms.CharField(label='Do you have a logo?', widget=forms.RadioSelect(choices=YES_NO))
    what_is_the_service = forms.CharField(label='', widget=forms.Textarea(attrs={'placeholder' : 'What service are you providing?'}))
    contact_number = forms.CharField(label='', widget=forms.NumberInput(attrs={'placeholder' : 'Contact number'}))
    email = forms.CharField(label='', widget=forms.EmailInput(attrs={'placeholder' : 'Email address'}))
    timeframe = forms.MultipleChoiceField(widget=forms.CheckboxSelectMultiple,
                                          choices=TIMEFRAME)
    aim  = forms.CharField(label='', widget=forms.Textarea(attrs={'placeholder' : 'What will be the aim for your website?'}))
    products_product_images = forms.CharField(label='Do you have any product images?', widget=forms.RadioSelect(choices=YES_NO))
    products_info = forms.CharField(label='Do you your product info (eg, product names, pricing, descriptions etc.)?', widget=forms.RadioSelect(choices=YES_NO))
    pages_needed = forms.CharField(label="Select which pages you'll need?", widget=forms.RadioSelect(choices=PAGES_NEEDED))


    class Meta:
        model = InfoFormModel
        fields = (
            'brand_name',
            'logo',
            'what_is_the_service',
            'contact_number',
            'email',
            'timeframe',
            'aim',
            'products_product_images',
            'products_info',
            'pages_needed',
        )

views.py

def home(request):
    submitted = False
    if request.method == 'POST':
        form = InfoForm(request.POST)
        if form.is_valid():
            form.save()
            return render(request, 'thanks.html')
            # return HttpResponseRedirect('/?submitted=True')
    else:
        form = InfoForm()
        if 'submitted' in request.GET:
            submitted = True

    form = InfoForm

    context = {
        'form': form,
        'submitted': submitted,
    }
    return render(request, 'home.html', context)

任何帮助都将不胜感激。谢谢!

Answer 1

我认为您的模型字段和表单字段之间存在差异。

在您的模型中，您将timeframe字段定义为：

timeframe = models.CharField(choices=TIMEFRAME, max_length=100, blank=False, null=False, default='')

在表单代码中，您将timeframe字段定义为：

timeframe = forms.MultipleChoiceField(widget=forms.CheckboxSelectMultiple, choices=TIMEFRAME)

在验证数据之后，MultipleChoiceField将尝试将一个列表分配给InfoFormModel上的timeframe属性(顺便说一句，糟糕的命名)。这个模型属性应该包含一个字符串。

我认为有两种方法可以解决这个问题。

1. 在模型中使用posgtres的ArrayField。ArrayField支持将列表分配给它。别忘了迁移并运行它们。另外，请注意，只有当您使用PostgreSQL DB.

时，这才有效。

from django.contrib.postgres.fields import ArrayField


class InfoFormModel(models.Model):
    ...
    timeframe = ArrayField(CharField(choices=TIMEFRAME, max_length=100), default=[])
    ...

1. 重写MultipleChoiceField以返回字符串而不是列表。通过重写，可以使字段以逗号分隔字符串的形式返回列表。这也意味着您需要从模型代码中的字段中删除choices kwarg，因为如果保存了多个选项，这些字段将不会通过验证。