Re: Dynamic ModelForm fields

On Sunday, January 30, 2011 6:01:00 PM UTC, a.esmail wrote:

Hello,
I tried my best with no luck.
Here are the relevant code snippets:

<snip>

#################################################
Item form:
class ItemForm(forms.ModelForm):
    def __init__(self, fields_list, *args, **kwargs):
        super(ItemForm, self).__init__(*args, **kwargs)
        for field in self.fields:
            if field not in fields_list:
                field_name = str(field)
                del self.fields[field_name]

    class Meta():
        model = Item

#################################################

I know this is not the best way to do this, but I just want to
understand why this happens.
For some reason, the for loop in ItemForm doesn't loop through all the
fields.
It only goes through 8, sometimes 9 fields out of the 14 in
self.fields. (e.g., I can't see the activation_code field in the
loop).
I printed self.fields and it showed all the fields in the Item model,
so why don't some of them show up in the loop?
I want to filter the fields based on the category chosen. The
fields_list parameter is a list of strings representing the fields I
want to include in the final form.

Any help would be appreciated. I've spent more hours than I can count
on this.
Thank you.

You're modifying a list while iterating through it. Don't do that. Make a copy of the list and use that instead. Or, even better:

    self.fields = [f for f in self.fields if str(f) in fields_list]

--

DR.

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