Django admin - remove field if editing an object

Question

I have a model which is accessible through the Django admin area, something like the following:

# model
class Foo(models.Model):
    field_a = models.CharFie         


        

Answer 1

You can create a custom ModelForm for the admin to drop the field in the __init__

class FooForm(forms.ModelForm):
    class Meta(object):
        model = Foo

    def __init__(self, *args, **kwargs):
        super(FooForm, self).__init__(*args, **kwargs)
        if self.instance and self.instance.pk:
            # Since the pk is set this is not a new instance
            del self.fields['field_b']

class FooAdmin(admin.ModelAdmin):
    form = FooForm

EDIT: Taking a hint from John's comment about making the field read-only, you could make this a hidden field and override the clean to ensure the value doesn't change.

class FooForm(forms.ModelForm):
    class Meta(object):
        model = Foo

    def __init__(self, *args, **kwargs):
        super(FooForm, self).__init__(*args, **kwargs)
        if self.instance and self.instance.pk:
            # Since the pk is set this is not a new instance
            self.fields['field_b'].widget = forms.HiddenInput()

    def clean_field_b(self):
        if self.instance and self.instance.pk:
            return self.instance.field_b
        else:
            return self.cleaned_data['field_b']  

Answer 2

You can also do the following

class FooAdmin(admin.ModelAdmin)
    def change_view(self, request, object_id, extra_context=None):       
        self.exclude = ('field_b', )
        return super(SubSectionAdmin, self).change_view(request, object_id, extra_context)

Taken from here Django admin: exclude field on change form only