现有数据库中 Y/N 字符串字段上的 Django Forms CheckboxInput

Question

我对 Django 比较陌生，我正在制作一个连接到现有 MySQL 数据库的表单。

我想做的是为国家/地区创建一个维护页面。我的数据库中的字段之一是 eu_member_state.

我在这里要做的是为此字段创建一个复选框，这样我就可以为最近脱离欧盟的英国取消选中它。

class CountryForm(forms.ModelForm):
    class Meta():
        model = Countries
        fields = '__all__'

        widgets = {
            'eu_member_state': forms.CheckboxInput()
        }

复选框确实出现在我的表单上，但我怎样才能使它与我的数据库对话？如何仅在数据库值为 'Y' 时选中此复选框，以及如何在保存时将其写回我的数据库，以便选中时 'Y' 未选中时 'N'？

这是模型代码：

from django.db import models

class Countries(models.Model):
    country = models.CharField(unique=True, max_length=3)
    descr = models.CharField(max_length=50, blank=True, null=True)
    descrshort = models.CharField(max_length=20, blank=True, null=True)
    country_2char = models.CharField(max_length=2, blank=True, null=True)
    eu_member_state = models.CharField(max_length=1, blank=False, null=False, default='N')

    class Meta:
        db_table = 'countries'
        verbose_name_plural = "countries"

    def __str__(self):
        return self.descr

Answer 1

我设法通过创建自定义 CheckboxInput 字段并在 forms.py 中对其进行初始化来解决这个问题。

class CountryForm(forms.ModelForm):

    eu_member_state_flag = forms.BooleanField(required=False,label='EU member state')

    class Meta():
        model = Countries
        exclude = ('eu_member_state',)


    def __init__(self, *args, **kwargs):
        super(CountryForm, self).__init__(*args, **kwargs)

        if self.instance.eu_member_state == "Y":
            flag_value = True
        else:
            flag_value = False

        self.initial['eu_member_state_flag'] = flag_value

然后在 views.py 中获取 CheckboxInput 字段的值并将其转换为 'Y' 或 'N'.

class UpdateCountryView(LoginRequiredMixin,UpdateView):
    login_url= '/login/'
    redirect_field_name = 'tour_admin/countries_list.html'
    form_class = CountryForm
    model = Countries

    def form_valid(self, form):
        if form.is_valid():
            data = form.cleaned_data

            if data['eu_member_state_flag']:
                data['eu_member_state'] = 'Y'
                self.object.eu_member_state = 'Y'
            else:
                data['eu_member_state'] = 'N'
                self.object.eu_member_state = 'N'
            self.object.save()

        return HttpResponseRedirect(self.get_success_url())

    def get_success_url(self):
        return reverse('countries_list')

现有数据库中 Y/N 字符串字段上的 Django Forms CheckboxInput

Django Forms CheckboxInput on Y/N String field in existing database

django

forms

django-forms

modelform