如何從管理員動態排除非模型字段？

Question

我添加了一個自定義字段到的ModelForm在管理使用：

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) 

這一領域的重點是收集初始對象創建過程中需要更多的數據。因此，它應該只在創建新對象時出現（檢查「實例」）。

我遇到的問題是在編輯現有對象時使字段消失。我試過了：

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

但是，只有擺脫了文本輸入字段，而不是標籤。

我還試圖對這些變化（也使用base_fields到位領域的super()調用之前）：

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'  

之前做這些）調用超（也嘗試過，但也失敗：

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

試試這個：

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

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

Answer 2

如果刪除不起作用（我不知道爲什麼），那麼動態添加呢？

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

這裏還有一個關於如何create dynamic forms的鏈接。 （我認爲這甚至是啓動Django的人？）