Readonly for existing items only in Django admin inline

Question

I have a tabular inline model in the Django admin. I need 1 of the fields to not be changeable after it has been created, but setting it as readonly (via readonly_fields) wh

Answer 1

You can achieve this with only a single inline like so:

class MyInline(admin.TabularInline):
    fields = [...]
    extra = 0

    def has_change_permission(self, request, obj):
        return False