passing arguments to a dynamic form in django

I have a Dynamic Form in forms. How can I pass an argument from my view when I instantiate my form?

Something like:

form = DynamicForm("some string argument I'm passing to my form")

This is the form I have:

class DynamicFo开发者_StackOverflow中文版rm(Form):
def __init__(self, *args, **kwargs):
    super(DynamicForm, self).__init__(*args, **kwargs)
    for item in range(5):
        self.fields['test_field_%d' % item] = CharField(max_length=255)

Add it as keyword argument, say it's called my_arg. Make sure to pop() the keyword arg before calling super(), because the parent class's init method doesn't accept extra keyword arguments.

class DynamicForm(Form):
  def __init__(self, *args, **kwargs):
    my_arg = kwargs.pop('my_arg')
    super(DynamicForm, self).__init__(*args, **kwargs)
    for item in range(5):
        self.fields['test_field_%d' % item] = CharField(max_length=255)

And when you create form it's like this:

form = DynamicForm(..., my_arg='value')

You can also achieve this by overriding the get_form_kwargs of the FormMixin, available in class based views.

class CustomDynamicFormView(FormView):  # inherit any view with formmixin...
      form_class = DynamicForm
      
      def get_form_kwargs(self):
          kwargs = super(CustomDynamicFormView, self).get_form_kwargs()
          kwargs['custom_variable'] = 'my custom variable'
          return kwargs

Then in your form

class DynamicForm(forms.Form):
    def __init__(self, *args, **kwargs):
        my_var = kwargs.pop('custom_variable') 
        # remove this b4 calling super otherwise it will complian
        super(DynamicForm, self).__init__(*args, **kwargs)
        # do what you want with my_var

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