[英]Django: inlineformset_factory, passing parameters/variables
我對django相當陌生,遇到問題,希望尋求幫助。
將自定義參數傳遞給我的表單時出現錯誤
KeyError at /someurl
'my_arg'
Request Method: GET
Request URL: http://localhost:8000/
Django Version: 1.8.2
Exception Type: KeyError
Exception Value: 'my_arg'
Exception Location: ..../forms.py in __init__, line 108(points at 'my_arg = kwargs.pop('my_arg')' line)
Python Executable: C:\Python27\python.exe
Python Version: 2.7.10
Python Path:
['C:\\Users\\lolwat\\Desktop\\ITSWEBSITE',
'C:\\Windows\\system32\\python27.zip',
'C:\\Python27\\DLLs',
'C:\\Python27\\lib',
'C:\\Python27\\lib\\plat-win',
'C:\\Python27\\lib\\lib-tk',
'C:\\Python27',
'C:\\Python27\\lib\\site-packages']
它還在錯誤頁面上這樣說:
Error during template rendering
...
{% for field in form %}
...
這是我的表格:
class BaseFormSet(BaseInlineFormSet):
def __init__(self, *args, **kwargs):
self.my_arg = kwargs.pop("my_arg")
super(BaseFormSet, self).__init__(*args, **kwargs)
class SomeForm(ModelForm):
...
def __init__(self, *args, **kwargs):
my_arg = kwargs.pop('my_arg')
super(SomeForm, self).__init__(*args, **kwargs)
我的看法:
myformset = inlineformset_factory(modelA, modelB, formset = BaseFormSet, form=SomeForm, extra=1, can_delete=True)
def someview(request, obj_id):
var1 = get_object_or_404(SomeModel, id = obj_id)
somevalue = var1.ModelFieldValue
form = myformset (request.POST, my_arg=somevalue)
if request.method == 'POST':
...
else:
form = myformset(instance = myinstance, my_arg=somevalue)
return render(....)
我做錯了還是我做對了? 非常感謝。
UPDATE
我嘗試使用myformset.form = staticmethod(curry(SomeForm, my_arg=somevalue))
我的看法如下所示:
from django.utils.functional import curry
myformset = inlineformset_factory(modelA, modelB, formset = BaseFormSet, form=SomeForm, extra=1, can_delete=True)
def someview(request, obj_id):
var1 = get_object_or_404(SomeModel, id = obj_id)
somevalue = var1.ModelFieldValue
myformset.form = staticmethod(curry(SomeForm, my_arg=somevalue))
form = myformset (request.POST, my_arg=somevalue)
if request.method == 'POST':
...
else:
form = myformset(instance = myinstance, my_arg=somevalue)
return render(....)
並且它正在工作,我正在使用my_arg
通過__init__
過濾SomeForm的ModelChoiceField
,並且我的表單如下所示:
class SomeForm(ModelForm):
MyField = ModelChoiceField(queryset=SomeModel.objects.none())
def __init__(self, *args, **kwargs):
my_arg = kwargs.pop('my_arg', None)
super(SomeForm, self).__init__(*args, **kwargs)
self.fields['MyField'].queryset = SomeModel.objects.filter(fkey = my_arg)
並且保存后我得到<DjangoObject> is not JSON serializable
錯誤
之所以會出現此錯誤,是因為您的內部表單SomeForm
不會在kwargs
my_arg
作為參數接收。 並且因為您使用不帶默認值的kwargs.pop('my_arg')
->會得到KeyError
。 如果您使用.pop
與提供的默認值( kwargs.pop('my_arg', None)
),你不會得到一個KeyError
。
如果您確實需要將my_arg
傳遞到內部SomeForm
請查看以下問題: 此處 , 此處和此處
更新:
據我my_arg
,您需要my_arg
來過濾字段的查詢集。 好吧,您不需要在inner_form.__init__
執行此inner_form.__init__
,而是在您的formset.__init__
方法中構造了所有表單之后。
像這樣:
class BaseFormSet(BaseInlineFormSet):
def __init__(self, *args, **kwargs):
my_arg = kwargs.pop("my_arg")
super(BaseFormSet, self).__init__(*args, **kwargs)
for form in self.forms:
form.fields['my_field'].queryset = SomeModel.objects.filter(fkey = my_arg)
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