django - Remove fields from ModelForm

Question

i have a simple ModelForm:

class MyForm(ModelForm):

    def __init__(self, *args, **kwargs):
        super(MyForm, self).__init__(*args, **kwargs)
        del self.fields['name']

As you can see, I try to remove a field from the form's field list (the field definitively exists in the model), but I get an Exception:

TemplateSyntaxError at [..]

Caught an exception while rendering: "Key 'name' not found in Form"

I did not write a custom form, so the template where the error occurs is:

/templates/admin/includes/fieldset.html, error at line 4

Any ideas?

-- UPDATE --

The problem appears only in the admin area.

-- UPDATE 2 --

Maybe a trace dump gives more info:

Original Traceback (most recent call last):
  File "/Library/Python/2.5/site-packages/django/template/debug.py", line 71, in render_node
    result = node.render(context)
  File "/Library/Python/2.5/site-packages/django/template/defaulttags.py", line 155, in render
    nodelist.append(node.render(context))
  File "/Library/Python/2.5/site-packages/django/template/defaulttags.py", line 239, in render
    value = bool_expr.resolve(context, True)
  File "/Library/Python/2.5/site-packages/django/template/__init__.py", line 546, in resolve
    obj = self.var.resolve(context)
  File "/Library/Python/2.5/site-packages/django/template/__init__.py", line 687, in resolve
    value = self._resolve_lookup(context)
  File "/Library/Python/2.5/site-packages/django/template/__init__.py", line 722, in _resolve_lookup
    current = current()
  File "/Library/Python/2.5/site-packages/django/contrib/admin/helpers.py", line 81, in errors
    return mark_safe(u'
'.join([self.form[f].errors.as_ul() for f in self.fields]).strip('
'))
  File "/Library/Python/2.5/site-packages/django/forms/forms.py", line 105, in __getitem__
    raise KeyError('Key %r not found in Form' % name)
KeyError: "Key 'name' not found in Form"

In the admin area, I use the Grapelli-Theme. Maybe this has to do with the problem?

Answer 1

I had the same problem. This is how I made it work in the new Django (trunk):

class MyModelAdmin(admin.ModelAdmin):
    # Your stuff here..

    def get_form(self, request, obj=None, **kwargs):
        if request.user.is_staff: # condition
            self.exclude = ('field',)
        return super(PublishAdmin, self).get_form(request, obj=obj, **kwargs)

By overriding the get_form method and putting the logic here you can select which Form you want to have displayed. Above I have displayed the standard form when a condition was met.