Question

好的，我有一个“模块”模型，这个模型涵盖了我可以用它创建的4种不同类型模块的所有字段。

其中一个模块需要ManyToManyField，因此我可以存储最近的付款，然后将它们循环到模板中。

以下是模块的模型：

class MarketModules(models.Model):
    types = (
    ('1', 'Server Status'),
    ('2', 'Recent Donations'),
    ('3', 'Donation Goal'),
    ('4', 'Textbox')
    )

    id = models.AutoField("Module id", primary_key=True, editable=False)
    owner = models.ForeignKey(User, blank=True, null=True)
    marketid = models.ForeignKey(Market, blank=True, null=True)
    type = models.CharField("Module type", choices=types, max_length=100, default=1, blank=True, null=True)
    order = models.IntegerField("Module order", default=1, blank=True, null=True)

    title = models.CharField("Module title", max_length=200, default="Module")
    text = models.CharField("Text", max_length=3000, blank=True, null=True)

    goal = models.IntegerField("Monthly goal",default=100, blank=True, null=True)
    goalpercentage = models.IntegerField("Monthly percentage", default=100, blank=True, null=True)
    goalamount = models.IntegerField("Monthly amount", default=0, blank=True, null=True)

    maxDisplay = models.IntegerField("Display amount",default=5, blank=True, null=True)
    recentdonors = models.ManyToManyField(ItemsBought, null=True, blank=True)

    ip = models.CharField("Server IP", max_length=100, blank=True, null=True)
    port = models.IntegerField("Server port", max_length=20, default=25565, blank=True, null=True)
    players = models.IntegerField("Players Online", max_length=20, blank=True, null=True)
    playerpercentage = models.IntegerField("Player percentage", default=100, blank=True, null=True)
    maxplayers = models.IntegerField("Max Players", max_length=20, blank=True, null=True)
    playersnames = models.TextField("Player Names", max_length=5000, blank=True, null=True)
    online = models.BooleanField("Online", default=0)
    motd = models.CharField("MOTD", blank=True, null=True, max_length=250)

    enabled = models.BooleanField(default=True)
    def __unicode__(self):
        return'%s' % self.id

以下是编辑表单的Views.py：

if request.method == "POST":
    newmodule = ModuleForm(request.POST, instance=instance)
    if newmodule.is_valid():
        module = newmodule.save()
        if module.type == '1':
            query_server(MarketModules.objects.filter(pk=module.id))
        elif module.type == '3':
            CalGoal(MarketModules.objects.filter(pk=module.id), module.goal)
        elif module.type == '2':
            RecentDonors(module.id, module.maxDisplay)
        return redirect("/controlpanel/modules/")
else:
    newmodule = ModuleForm(instance=instance)

，这是ModuleForm的forms.py：

class ModuleForm(forms.ModelForm):
    text = forms.CharField(required=False, widget=CKEditorWidget(attrs={'class': 'form-control'}))
    title = forms.CharField(required=False, widget=forms.TextInput(attrs={'class': 'form-control'}))
    ip = forms.CharField(required=False, widget=forms.TextInput(attrs={'class': 'form-control'}))
    port = forms.CharField(required=False, widget=forms.TextInput(attrs={'class': 'form-control'}))
    maxDisplay = forms.CharField(required=False, widget=forms.TextInput(attrs={'class': 'form-control'}))
    goal = forms.CharField(required=False, widget=forms.TextInput(attrs={'class': 'form-control'}))
    class Meta:
        model = MarketModules

    def save(self, commit=True, owner=None, marketid=None, order=None, type=None):
        modelform = super(ModuleForm, self).save(commit=False)
        if type:
            modelform.type = type
        if order:
            modelform.order = order
        if owner:
            modelform.owner = owner
        if marketid:
            modelform.marketid = marketid
        if commit:
            modelform.save()
        return modelform

问题是即使ManytoMany字段应该接受空白进行验证，并且在保存时应该被允许为空我不断收到错误

invalid literal for int() with base 10: ''

如果我删除blank=True和null=True，我只会收到验证错误，说明其按预期要求。

如何将ManyToMany字段保存为空？

根据要求进行跟踪：

Traceback:
File "C:\Python27\Lib\site-packages\django\core\handlers\base.py" in get_response
  115.                         response = callback(request, *callback_args,     **callback_kwargs)
File "C:\Users\xXxKillDogxXx\Desktop\MinecraftMarket-Redesign\market\views.py" in    EditModule
  617.             module = newmodule.save()
File "C:\Users\xXxKillDogxXx\Desktop\MinecraftMarket-Redesign\market\forms.py" in save
  99.             modelform.save()
File "C:\Python27\Lib\site-packages\django\db\models\base.py" in save
  546.                        force_update=force_update, update_fields=update_fields)
File "C:\Python27\Lib\site-packages\django\db\models\base.py" in save_base
  626.                             rows =     manager.using(using).filter(pk=pk_val)._update(values)
File "C:\Python27\Lib\site-packages\django\db\models\query.py" in _update
  605.         return query.get_compiler(self.db).execute_sql(None)
File "C:\Python27\Lib\site-packages\django\db\models\sql\compiler.py" in execute_sql
  1014.         cursor = super(SQLUpdateCompiler, self).execute_sql(result_type)
File "C:\Python27\Lib\site-packages\django\db\models\sql\compiler.py" in execute_sql
  830.             sql, params = self.as_sql()
File "C:\Python27\Lib\site-packages\django\db\models\sql\compiler.py" in as_sql
  979.                 val = field.get_db_prep_save(val, connection=self.connection)
File "C:\Python27\Lib\site-packages\django\db\models\fields\__init__.py" in     get_db_prep_save
  304.                                       prepared=False)
File "C:\Python27\Lib\site-packages\django\db\models\fields\__init__.py" in     get_db_prep_value
  296.             value = self.get_prep_value(value)
File "C:\Python27\Lib\site-packages\django\db\models\fields\__init__.py" in     get_prep_value
  991.         return int(value)

Exception Type: ValueError at /controlpanel/modules/980/1/edit/
Exception Value: invalid literal for int() with base 10: ''

Answer 1

问题是，您的ModuleForm宣布goal为CharField。你告诉Django这应该是一个字符串，所以当没有输入一个值时，空字符串（''）会被传递给数据库层，这就是期望一个整数。

解决方案很简单：goal = forms.IntegerField(...)。请确保对其他字段执行相同操作（例如port，maxDisplay）。

Django manytomany字段为int（）的字段无效，基数为10：''

1 个答案: