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'.
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