Question

我已将自定义字段添加到ModelForm以供管理员使用：

class MyModel(models.Model):
    name = models.CharField(max_length=64)
     ...etc...

class MyModelAdminForm(forms.ModelForm):
    dynamicfield = forms.IntegerField()

    def __init__(self, *args, **kwargs):
        super(MyModelAdminForm, self).__init__(*args, **kwargs)
        if 'instance' in kwargs:
            #remove dynamicfield from the form, somehow?

    def save(self, *args, **kwargs):
        #do something with dynamicfield
        super(MyModelAdminForm, self).save(*args, **kwargs)

    class Meta:
        model = MyModel

class MyModelAdmin(admin.ModelAdmin):
    form = MyModelAdminForm

admin.site.register(MyModel, MyModelAdmin)

该字段的目的是收集初始对象创建期间所需的其他数据。因此，它应该仅在创建新对象时出现（检查'实例'）。

我遇到的问题是在编辑现有对象时使该字段消失。我试过了：

self.fields['dynamicfield'].widget = self.fields['dynamicfield'].hidden_widget()

但只能删除文本输入字段，而不是标签。

我也试过这些变体（在super()调用之前也使用base_fields代替字段）：

del self.fields['dynamicfield'] #yields error:

TemplateSyntaxError at /admin/db/myapp/mymodel/6/
Caught an exception while rendering: Key 'dynamicfield' not found in Form


self.fields['dynamicfield'].hidden = True #Does nothing.

self.fields['dynamicfield'] = None #yields error:

TemplateSyntaxError at /admin/db/catalog/product/6/
Caught an exception while rendering: 'NoneType' object has no attribute 'label'

执行这些之前对super（）的调用也尝试了，但也失败了：

del self.base_fields['dynamicfield'] #yields error:
TemplateSyntaxError at /admin/db/myapp/mymodel/6/
Caught an exception while rendering: Key 'dynamicfield' not found in Form

Answer 1

试试这个：

    def __init__(self, *args, **kwargs):

        if 'instance' in kwargs:
            del self.base_fields['dynamicfield']
        super(MyModelAdminForm, self).__init__(*args, **kwargs)

Answer 2

如果删除不起作用（我不知道为什么）动态添加呢？

def __init__(self, *args, **kwargs):
    super(MyModelAdminForm, self).__init__(*args, **kwargs)
    if 'instance' not in kwargs:
       self.fields['dynamicfield'] = forms.IntegerField()

这里还有一个关于如何create dynamic forms的链接。（我认为甚至是开始Django的那个人？）

如何从管理员中动态排除非模型字段？

2 个答案: