Question

某些模型字段在django表单中被排除。当我使用form.save()时，这些字段的现有值会自动替换为空字符串。

但根据django doc：

“上述逻辑未包含在表单中的任何字段都不会通过表单的save（）方法设置”

不确定我做错了什么。这是我的表格和模型：

class ProfileEditForm(forms.ModelForm):

    first_name = forms.CharField(
        required=True,
        widget=forms.TextInput(attrs={
            'class': 'form-control', 'placeholder': 'First Name'
        })
    )
    last_name = forms.CharField(
        required=True,
        widget=forms.TextInput(attrs={
            'class': 'form-control', 'placeholder': 'Last name'
        })
    )
    division = forms.ChoiceField(
        required=True,
        choices=[(x, x) for x in range(1, 32)],
        widget=forms.Select(attrs={'class': 'form-control'})
    )
    city = forms.ChoiceField(
        required=True,
        choices=[(x, x) for x in range(1, 32)],
        widget=forms.Select(attrs={'class': 'form-control'})
    )
    thana = forms.ChoiceField(
        required=True,
        choices=[(x, x) for x in range(1, 32)],
        widget=forms.Select(attrs={'class': 'form-control'})
    )
    national_id = forms.CharField(
        required=False,
        widget=forms.TextInput(attrs={
            'class': 'form-control', 'placeholder': 'National ID'
        })
    )
    passport_number = forms.CharField(
        required=True,
        widget=forms.TextInput(attrs={
            'class': 'form-control', 'placeholder': 'Passport No'
        })
    )

    class Meta:
        model = Profile
        exclude = ['user', 'activated', 'activation_key', 'slug', 'created']
        # fields = ('username', 'email',)
        # fields = ('first_name', 'last_name', 'division', 'city', 'thana', 'national_id', 'passport_number')

    def save(self, commit=True):
        # Save the provided password in hashed format
        print("in save!")
        profile = super(ProfileEditForm, self).save(commit=False)
        profile.activated = True
        print(str(profile.activation_key))
        if commit:
            profile.save()
        return profile

模型

User = get_user_model()

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE, primary_key=True) # user.profile
    first_name = models.CharField(max_length=120, blank=True, null=True)
    last_name = models.CharField(max_length=120, blank=True, null=True)
    division = models.CharField(max_length=250, null=True, blank=True)
    city = models.CharField(max_length=250, null=True, blank=True)
    thana = models.CharField(max_length=250, null=True, blank=True)
    national_id = models.CharField(max_length=250, null=True, blank=True)
    passport_number = models.CharField(max_length=250, null=True, blank=True)
    timestamp = models.DateTimeField(auto_now_add=True, null= True)
    updated = models.DateTimeField(auto_now=True)
    created = models.BooleanField(default=False)
    activated = models.BooleanField(default=False)
    activation_key = models.CharField(max_length=200, null= True, blank= True)
    slug = models.SlugField(null=True, blank=True)

    def __str__(self):
        return self.user.username


def post_save_user_receiver(sender, instance, created, *args, **kwargs):
    print("In rl_post _save" + str(instance.slug) + str(instance.activation_key) + str(instance.activated))
    if created:
        profile, is_created = Profile.objects.get_or_create(user=instance)

post_save.connect(post_save_user_receiver, sender=Profile, dispatch_uid="rl_pre_save_receiver")

def rl_pre_save_receiver(sender, instance, *args, **kwargs):
    # instance.category = instance.category.capitalize()
    print("In rl_pre _save"+ str(instance.slug) + str(instance.activation_key) + str(instance.activated))

    if not instance.slug:
        instance.slug = unique_slug_generator(instance)

pre_save.connect(rl_pre_save_receiver, sender=Profile)

问候。

Answer 1

排除的字段activation_key和slug为CharField。它们将存储字符串值。

设置null=True时，它允许NULL值保存在数据库中。使用blank=True时，此字段将设置为可选字段。

允许NULL CharField即VARCHAR是不好的做法。您在同一列中有NULL个空字符串值''。它可能导致许多不必要的副作用。

如果不需要，CharField仅限blank=True first_name。 Django默认将它们保存为空字符串。所以没有任何问题。

你的问题是模型形式的错误概念。您不应该重新定义表单中的模型字段。

例如，如果需要null=True, blank=True，那么您在模型字段中不应该有[[a , b ], [c, d]]。您还可以在模型中设置小部件和选项。

django将空值设置为排除的模型字段

1 个答案: