Add thread pruning for threads that pass the maximum page threshhold

Each board is allowed a number of threads per page, and a maximum number
of pages (default 10 for both). If a thread falls off the last page, it
is deleted.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/views.py

@@ -3,7 +3,6 @@ from django.http import Http404, HttpResponseRedirect
 from django.shortcuts import render, get_object_or_404
 from django.views.generic import DetailView
 from django.views.generic.edit import CreateView
-
 from board.models import Post, Board
 
 __all__ = ("BoardView", "PostView")
@@ -29,7 +28,6 @@ class BoardView(CreateView):
     fields = ["subject", "name", "text", "image"]
     slug_field = "url"
     slug_url_kwarg = "url"
-
     template_name = "board/board_detail.html"
 
     def get_context_data(self, **kwargs):
@@ -38,13 +36,11 @@ class BoardView(CreateView):
         kwargs["board"] = board
         page = self.kwargs.get("page", 1)
 
-        # TODO - allow max number of pages to be specified per-board
-        if page not in range(1, 10 + 1):
+        if page not in range(1, board.max_pages + 1):
             raise Http404()
 
-        PER_PAGE = 10
-        start = (page - 1) * PER_PAGE
-        end = start + PER_PAGE
+        start = (page - 1) * board.threads_per_page
+        end = start + board.threads_per_page
         kwargs["threads"] = board.threads.order_by("-last_bump")[start:end]
         kwargs["page"] = page
         kwargs["max_upload_size"] = settings.MAX_UPLOAD_SIZE