Starting to play around with newforms and I am trying to create a form
with fewer fields than the model and post-fill those fields in the view.
With the following example models and form:
class Book(models.Model):
author = models.CharField(maxlength=100, blank=True)
title = models.CharField(maxlength=100)
class BookForm(forms.Form):
title = forms.CharField()
From looking at the code, I was lead to believe I could do something
like this:
book = Book.objects.get_or_create(author='me', title='go')[0]
form = forms.form_for_instance(book, form=BookForm)()
The form rendered the single title field, but didn't set it's initial
value to "go". It appears that form_for_instance is creating all the
form fields for the model (with correct initial values), but the
creation of the new form type in the last line of form_for_instance()
blows away the fields just created in form_for_instance() with the
base_fields created in DeclarativeFieldsMetaclass.__new__.
Does the form parameter to the form_for_instance() only intended to
accept forms inheriting BaseForm and not Form? The docstring does
mention BaseForm. If this is the case, then what is best way to make a
form with fewer fields than the model? Removing them from form.fields
after instantiating my form instance and overriding the save() method of
my custom form to insert the desired values after my form has been
validated?
Gary
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