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In general, don't use incremental primary keys in the URLs, because it is not safe to expose them to the end user: the total amount of items would be visible, and it would be too easy to navigate through different items by just changing the URL path.
You can use the primary keys in the URLs for the detail pages only if they are Universal Unique Identifiers (UUIDs) or generated random strings. Otherwise, create and use a slug field, as follows:
class Idea(UrlBase):
slug = models.SlugField(_("Slug for URLs"), max_length=50)