Django disable editing (but allow adding) in TabularInline view

Question

I want to disable editing ALL objects within a particular TabularInline instance, while still allowing additions and while still allowing editing of the parent model.

I

Answer 1

See this solution: Django admin: make field editable in add but not edit

Override get_readonly_fields method:

def get_readonly_fields(self, request, obj=None):
    if obj: # obj is not None, so this is an edit
        return ['name1',..] # Return a list or tuple of readonly fields' names
    else: # This is an addition
        return []