Django admin different inlines for change and add view

Question

I need separate views for add and change page. In add page I'd like to exclude some fields from inline formset. I've prepared two TabularInline classes, one of them contains property 'exclude'. I tried to use them as follows:

class BoxAdmin(admin.ModelAdmin):
    def change_view(self, request, obj_id):
        self.inlines=[ItemChangeInline,]
        return super(BoxAdmin, self).change_view(self.request, obj_id)
    def add_view(self, request):
        self.inlines=[ItemAddInline,]
        return super(BoxAdmin, self).add_view(self, request)

with no effect (no inline is shown at all).

Answer 1

It works with Django 1.5+ and seems fine & elegant:

// admin.py
class BoxAdmin(ModelAdmin):

    inlines = ()

    def change_view(self, request, object_id, form_url='', extra_context=None):
        self.inlines = (ItemChangeInline, )
        return super(BoxAdmin, self).change_view(request, object_id)

    def add_view(self, request, form_url='', extra_context=None):
        self.inlines = (ItemAddInline, )
        return super(BoxAdmin, self).add_view(request)

hope it can be useful for anyone

Answer 2

Here is the code that seems to be working:

class BoxAdmin(admin.ModelAdmin):
   def change_view(self, request, obj_id):
        self.inlines=[ItemChangeInline,]
        for inline_class in self.inlines:
            inline_instance = inline_class(self.model, self.admin_site)
            self.inline_instances.append(inline_instance)
        return super(BoxAdmin, self).change_view(request, obj_id)
    def add_view(self, request):
        self.inlines=[ItemAddInline,]
        for inline_class in self.inlines:
            inline_instance = inline_class(self.model, self.admin_site)
            self.inline_instances.append(inline_instance)
        return super(BoxAdmin, self).add_view(request)

However, this looks inelegant, cause this part:

            for inline_class in self.inlines:
            inline_instance = inline_class(self.model, self.admin_site)
            self.inline_instances.append(inline_instance)

is a copy-paste from init method of admin.ModelAdmin (so it is run twice).

Answer 3

Why in add_view you have .add_view(self, request) and in change view you have .change_view(self.request, ..)? I believe, you don't need self in add_view, since you use super.