Preprocess data before showing it on Admin

[Pedro Vasconcelos]

Hello!

Anyone knows how preprocess data before showing it on Admin (change page)?

 ______      ______________      _______
/      \    /              \    /       \
|  DB  | -> | PREPROCESSOR | -> | ADMIN |
\______/    \______________/    \_______/

I want to edit data (in Admin) in a human-friendly-format (my custom format) and store it in XML. So, when a user comes to edit data on Admin, it cant be the raw data from DB. It need to be converted (preprocessed) before and then showed.

Anyone can help me? Thanks!

--
Pedro Vasconcelos
85 8767.1843
ptronico (skype)

[Marc Aymerich]

HI pedro,
you can do it creating a custom modelform
https://docs.djangoproject.com/en/dev/ref/contrib/admin/#django.contrib.admin.ModelAdmin.form
--
Marc

[Pedro Vasconcelos]

Hello Marc! 

Thanks for replying. Unfortunately I cant realised how to get the current value, change it and populate the form using a ModelForm. I've tried it actually.

I appreciate if you send me tips on that direction!

Thanks a lot!

--
Marc

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[Marc Aymerich]

On Sun, Apr 1, 2012 at 9:42 PM, Pedro Vasconcelos <pe...@pedrorafa.com> wrote:
> Hello Marc!
>
> Thanks for replying. Unfortunately I cant realised how to get the current
> value, change it and populate the form using a ModelForm. I've tried it
> actually.
>

sure, you can do it on form __init__ method

something like

class YourForm(ModelForm):
def __init__(self, *args, **kwargs):
super(YourForm, self).__init__(*args, **kwargs)
self.fields['your_field'].initial = your_postprocess_method()

also you should override the save form method in order to "reverse"
the postprocess and save the data in raw format.

--
Marc

[Pedro Vasconcelos]

Thanks for your time and your tips Marc!

I had tried earlie what you suggested but it didnt solved my problem because it only assigns initial values to new records and not to existents ones.

But i finally figured out a small change on code which does it well. I just replaced "self.fields['your_field'].initial" with "self.initial['text']".

Thanks again! Regards,

--
Marc

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