Django:使用ModelForm编辑现有的数据库条目 [英] Django: using ModelForm to edit existing database entry
问题描述
我已经创建了一个ModelForm类,以便能够创建和编辑数据库条目。创建新条目工作良好,但是,我不知道如何使用ModelForms来编辑/更新现有条目。我可以使用数据库实例来实例化一个ModelForm:
form = MyModelForm(instance = MyModel.objects.get(pk = some_id ))
但是,当我将其传递给模板并编辑字段,然后尝试保存,我创建一个新的数据库条目,而不是更新some_id?
Edit1:
这是我的观点
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如果form.is_valid():
editedEntry = form.save()#< - 创建新条目,而不是更新
记住你还需要使用实例
参数在POST上实例化。
instance = MyModel.objects.get(whatever)
if request.method ==POST :
form = MyModelForm(request.POST,instance = instance)
...
else:
form = MyModelForm(instance = instance)
I have created a ModelForm class to be able to create and edit database entries. Creating new entries works well, however, i dont know how to use ModelForms to edit/update an existing entry. I can instantiate a ModelForm with a database instance using:
form = MyModelForm(instance=MyModel.objects.get(pk=some_id))
However, when i pass this to a template and edit a field and then try to save it, i create a new database entry instead of updating "some_id"?
Edit1: This is my view
def editData(request):
if request.method == 'POST':
form = MyModelForm(request.POST, request.FILES)
if form.is_valid():
editedEntry = form.save() # <-- creates new entry, instead of updating
Remember you still need to use the instance
parameter when you instantiate on POST.
instance = MyModel.objects.get(whatever)
if request.method == "POST":
form = MyModelForm(request.POST, instance=instance)
...
else:
form = MyModelForm(instance=instance)
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