Håkan Johansson wrote:
> While working on a complex form using 'newforms' I had some problem
> with 'initial' data.
> I have multiple forms using the 'prefix' argument to get different
> keys for them.
>
> As far as I know (*please* correct me if I am wrong) the only way to
> set initial data dynamically is to create the fields in __init__.
>
> Form example ('obj' is object to get initial data from):
> >>> import django.newforms as forms
> >>> class DaForm(forms.Form):
> ... def __init__(self, obj, *args, **kw):
> ... super(DaForm, self).__init__(*args, **kw)
> ... self.fields['time'] = forms.TimeField(initial=obj.time)
> ... self.fields['name'] = forms.CharField(initial=obj.name)
> ... # etc.
>
> >>> # No form data as we are viewing the objects.
> >>> form1 = DaForm(obj1, prefix='obj1')
> >>> form2 = DaForm(obj2, prefix='obj2')
>
> The problem with the example above is that the initial data for
> 'form1' is overwritten by the initial data in 'form2' so both forms
> give the same output. This happens because 'self.fields' belongs to
> the class and not the object instance.
>
> To solve this, you need to override the 'fields' attribute of the
> object:
> >>> import django.newforms as forms
> >>> from django.utils.datastructures import SortedDict
> >>> class DaForm(forms.Form):
> ... def __init__(self, obj, *args, **kw):
> ... super(DaForm, self).__init__(*args, **kw)
> ... self.fields = SortedDict()
> ... self.fields['time'] = forms.TimeField(initial=obj.time)
> ... self.fields['name'] = forms.CharField(initial=obj.name)
> ... # etc.
>
> If you have static fields combined with dynamic fields you will need
> to repopulate 'self.fields' from the class version. Using
> 'self.fields = self.fields.copy()' does not work as it returns a
> normal 'dict' and not a 'SortedDict'.
You don't have to repopulate. You can use:
self.fields = SortedDictFromList(self.fields.items())
To create a new SortedDict for self.fields with the correct ordering
which you can then update.
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