Mixin add field to fields in forms

[sebasti...@gmail.com]

Hello,

forms.py:

class Newsletterform(StandardMixin):

    class Meta:

        model = Newsletter

        fields = ['newslettername', 'from_link', 'to_list', 'email_subject', 'text_message', 'html_message' ]

Mixins.py:

class StandardMixin(forms.ModelForm):

    class Meta:

        abstract = True

    def __init__(self, *args, **kwargs):

        self.Meta.fields.append('owner')

        super(StandardMixin, self).__init__(*args, **kwargs)

i would append in Meta.Fields owner and after this super. But in Template this field are not shown. 

Why?

[Shaheed Haque]

Try updating self.declared_fields instead. 

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[sebasti...@gmail.com]

Hello,

Thanks for your fast response. But i don't know how i can use  self.declared_fields and why this would help me...

Regards

[Shaheed Haque]

On Sun, 18 Apr 2021 at 14:38, sebasti...@gmail.com <sebasti...@gmail.com> wrote:

Hello,

Thanks for your fast response. But i don't know how i can use  self.declared_fields and why this would help me...

The "how" is easy. Here is a fragment from my code where the problem is that every instance of FilesForm has content dependent on external factors (the "..." below):

  class FilesForm(forms.Form):
      def __init__(self, *args, **kwargs):

           self.declared_fields = OrderedDict()
           for name, field in ....items():
               self.declared_fields[name] = field
           super().__init__(*args, **kwargs)

The "why" is a deeper question, but in short, that's what the source code says the DeclarativeFieldsMetaClass for forms uses. Technically, I believe the code is a little ick because self.declared_fileds is a class member, not an instance member and so needs the funny-looking assignment so the instance has a value it can hack. You may need to copy the original dict as in "self.declared_fields = OrderedDict(self.declared_fields)" depending on your use case.

(Generally, the Django docs are amazing, but this is one area where I needed the source.)

Shaheed

 

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[Shaheed Haque]

Actually, looking again at the source, it might be generally belter to use self.base_fields. (Yes, my previous answer is not an exact copy of my code, so I got it wrong).