Django - ModelForm动态字段更新 [英] Django - ModelForm Dynamic field update

问题描述

我正在尝试更新某些字段的ModelForm，这些字段不是固定的。 （我只有导师，由视图自动填充）

I'm trying to update certain fields a ModelForm, these fields are not fixed. (I have only tutor that is autopopulated by the view)

型号：

class Session(models.Model):
  tutor = models.ForeignKey(User)
  start_time = models.DateTimeField()
  end_time = models.DateTimeField()
  status = models.CharField(max_length=1)

Form：

class SessionForm(forms.ModelForm):
  class Meta:
    model = Session
    exclude = ['tutor']

对于给定的会话，有时我需要仅更新 end_time ，有时只有 start_time &

For a given session sometimes I need to update only end_time, sometimes only start_time & end_time.

如何在视图中执行此操作？

How can I do that in a view ?

修改

我举了例子，但不限于这些例子，我需要更新的字段不是预定义的，我需要能够更新任何字段

I have given examples but it's not limited to these examples, the fields I need to update are not predefined, I need to be able to update any field(s)

推荐答案

不得不做类似的事情，虽然它不是很漂亮，它是非常有效的。它涉及在运行时动态创建类型，并使用该类型。对于某些文档，您可以查看 django的DynamicModels。

I've had to do something similar before, and while it isn't exactly pretty, it is quite effective. It involves dynamically creating a type at runtime, and using that type. For some documentation, you can see DynamicModels for django.

这里我们去..你的要求。

Here we go.. your requirements.

• 您想要使用表单更新模型


• 你想选择性地指定哪些字段在运行时更新

所以，一些代码：

def create_form(model, field_names):
    # the inner class is the only useful bit of your ModelForm
    class Meta:
        pass
    setattr(Meta, 'model', model)
    setattr(Meta, 'include', field_names)
    attrs = {'Meta': Meta}

    name = 'DynamicForm'
    baseclasses = (forms.ModelForm,)
    form = type('DynamicForm', baseclasses, attrs)
    return form

def my_awesome_view(request):
    fields = ['start_time', 'end_time']
    form = create_form(Session, fields)
    # work with your form!

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