Merges follower/following views

They were almost identical!

bookwyrm/views/relationships.py

@@ -0,0 +1,50 @@
+""" Following and followers lists """
+from django.core.exceptions import PermissionDenied
+from django.core.paginator import Paginator
+from django.db.models import Q, Count
+from django.template.response import TemplateResponse
+from django.views import View
+
+from bookwyrm.activitypub import ActivitypubResponse
+from bookwyrm.settings import PAGE_LENGTH
+from .helpers import get_user_from_username, is_api_request
+
+
+# pylint: disable=no-self-use
+class Relationships(View):
+    """list of followers/following view"""
+
+    def get(self, request, username, direction):
+        """list of followers"""
+        user = get_user_from_username(request.user, username)
+
+        if is_api_request(request):
+            if direction == "followers":
+                return ActivitypubResponse(user.to_followers_activity(**request.GET))
+            return ActivitypubResponse(user.to_following_activity(**request.GET))
+
+        if user.hide_follows and user != request.user:
+            raise PermissionDenied()
+
+        annotation_queryset = (
+            user.followers if direction == "followers" else user.following
+        )
+        follows = annotate_if_follows(request.user, annotation_queryset)
+
+        paginated = Paginator(follows.all(), PAGE_LENGTH)
+        data = {
+            "user": user,
+            "is_self": request.user.id == user.id,
+            "follow_list": paginated.get_page(request.GET.get("page")),
+        }
+        return TemplateResponse(request, f"user/relationships/{direction}.html", data)
+
+
+def annotate_if_follows(user, queryset):
+    """Sort a list of users by if you follow them"""
+    if not user.is_authenticated:
+        return queryset.order_by("-created_date")
+
+    return queryset.annotate(
+        request_user_follows=Count("followers", filter=Q(followers=user))
+    ).order_by("-request_user_follows", "-created_date")