Remove `pk_url_kwarg`, `slug_url_kwarg`, `slug_field`.

[tomchristie]

These were placed on the deprecation path in 2.3, and replaced with lookup_field (and later, lookup_url_kwarg).

The will move from "pending deprecation" to "deprecated" in 2.4.

They need to be removed in 3.0.

[cancan101]

@tomchristie
This is actually causing problems for me when using nested router.

I had been using:

    sites = serializers.HyperlinkedIdentityField(view_name='site-list',
                                                 lookup_field='slug', # Is this needed?
                                                 slug_url_kwarg='company_slug')

to deal with urls that look like:

/companies/<company_slug>/sites/<site_slug>

Now what do I do?

[xordoquy]

@cancan101 It feels like drf-nested-routers will need an update to reflect this change. One should probably open an issue there about this change.

[cancan101]

I will cross post the issue, but the new set of arguments seems to me to be too limiting to get the old behavior.

[cancan101]

Or is my problem as simple as using lookup_url_kwarg instead of slug_url_kwarg ?

[xordoquy]

I think you'll have to rename your field as Company:company_slug but that doesn't look good to me either.

[cancan101]

@chibisov does this issue affect your nested router code too?