姜戈“重复”模型表单

发布于 2024-09-17 00:53:28 字数 321 浏览 1 评论 0原文

我想知道是否有一种简单的方法在 Django 中创建“重复”ModelForm - 即预先填充现有模型实例内容的表单（某些字段除外，例如唯一的字段），但创建一个保存时的新实例。

我正在考虑向 ModelForm 提供一个实例，以便数据像“编辑”表单一样预先填充，然后在保存之前将实例设置为 None，但这给出了“'NoneType' 对象没有属性 'pk' '”在表单上调用 .save() 时出错。构建表单时提供实例的行为似乎会产生对其最终存在的某种依赖性。

我很难找到这个问题的解决方案，但我无法想象“重复”的形式太独特，所以也许我错过了一些简单的东西？

任何帮助将不胜感激。

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梦醒灬来后我 2024-09-24 00:53:28

我认为您需要的是一种填写表单中字段的初始值的方法。实现此目的的最佳方法是从现有实例创建初始值字典（由字段名称作为键）并将其提供给表单。

像这样的事情：

class AddressForm(forms.ModelForm):
    class Meta:
        model = Address

# Inside view:
address = Address.object.get(**conditions)
initial = dict()
for field in ('state', 'zipcode'): # Assuming these are the fields you want to pre-fill
    initial[field] = getattr(address, field)

form = AddressForm(initial = initial)

I think what you need is a way to fill in the initial values for the fields in the form. The best way to accomplish this would be to create a dictionary of initial values (keyed by field name) from an existing instance and supply this to the form.

Something like this:

class AddressForm(forms.ModelForm):
    class Meta:
        model = Address

# Inside view:
address = Address.object.get(**conditions)
initial = dict()
for field in ('state', 'zipcode'): # Assuming these are the fields you want to pre-fill
    initial[field] = getattr(address, field)

form = AddressForm(initial = initial)

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和影子一齐双人舞 2024-09-24 00:53:28

class AddressForm(forms.ModelForm):
    class Meta:
        model = Address

# Inside view:
address = Address.object.get(pk=<your-id>)
address.pk = None # that's the trick, after form save new object will be created
form = AddressForm(instance=address)

class AddressForm(forms.ModelForm):
    class Meta:
        model = Address

# Inside view:
address = Address.object.get(pk=<your-id>)
address.pk = None # that's the trick, after form save new object will be created
form = AddressForm(instance=address)

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