Can I override __new__ in Django ModelForm?

[אורי‎]

Hi,

I have a ModelForm with Django 1.11, and I'm moving a few fields to another model. Calling make_migrations causes an error because these fields don't exist in the current model. I added some of the fields to the form, but one of the fields is a TranslatedField and therefore there are currently 2 fields, and in the future there might be more, depending on the number of languages. The name of the field is city, and currently I get an error message "Unknown field(s) (city_en, city_he) specified for SiteProfile" (because I'm using 2 languages - "en" and "he") - but I want to create all the fields dynamically with a for loop over the languages we use in the project. Can I override (and is it a good programming method) the __new__ method or is there another way? I prefer not to hard-code the specific field names (city_en and city_he) because they may change in the future, depending on how many languages we use.

You can see my current commit (not working) on GitHub:

https://github.com/speedy-net/speedy-net/commit/f2c9b306c1a5f7a41b19d605f7871c07a67af93f 

And the current code of this branch:

https://github.com/speedy-net/speedy-net/blob/uri_move_fields_to_speedy_net_2019-07-10_b/speedy/match/accounts/forms.py 

I would like to know what is the best programming method to define a dynamic list of fields (which are all identical, and only one of them will be used, the other are removed in the __init__ method) in a ModelForm where the fields are saved in another model (there are 2 models but only one form).

I still didn't commit the migrations because of this error when running make_migrations.

(I defined a command make_migrations which only does makemigrations)

Thanks!

אורי

u...@speedy.net

[Jani Tiainen]

Hi.

You can add fields dynamically on model __init__ method and AFAIK that's best and recommended way to do it.

I'm not sure is that even in Django docs.

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