Show posts for last page when page out of range

lib/topic_view.rb

@@ -283,14 +283,10 @@ class TopicView
   private
 
   def filter_posts_in_range(min, max)
-    max_index = (filtered_post_ids.length - 1)
+    post_count = (filtered_post_ids.length - 1)
 
-    # If we're off the charts, return nil
-    return nil if min > max_index
-
-    # Pin max to the last post
-    max = max_index if max > max_index
-    min = 0 if min < 0
+    max = [max, post_count].min
+    min = [[min, max].min, 0].max
 
     @index_offset = min
 

spec/components/topic_view_spec.rb

@@ -224,6 +224,26 @@ describe TopicView do
       end
     end
 
+    describe '#filter_posts_paged' do
+      before { SiteSetting.stubs(:posts_per_page).returns(1) }
+
+      it 'returns correct posts for first page' do
+        topic_view.filter_posts_paged(1).should == [p1, p2]
+      end
+
+      it 'returns correct posts for requested page number' do
+        topic_view.filter_posts_paged(2).should == [p2, p3]
+      end
+
+      it 'returns correct posts for last page' do
+        topic_view.filter_posts_paged(4).should == [p5]
+      end
+
+      it 'returns posts for last page when page is out of range' do
+        topic_view.filter_posts_paged(100).should == [p5]
+      end
+    end
+
     describe "fitler_posts_before" do
       it "returns undeleted posts before a post" do
         topic_view.filter_posts_before(p5.post_number).should == [p3, p2, p1]
@@ -289,9 +309,18 @@ describe TopicView do
         near_view.index_offset.should == 1
         near_view.index_reverse.should be_false
       end
+
+      context "when 'posts per page' exceeds the number of posts" do
+        before { SiteSetting.stubs(:posts_per_page).returns(100) }
+
+        it 'returns all the posts' do
+          near_view = topic_view_near(p5)
+          near_view.posts.should == [p1, p2, p3, p5]
+          near_view.index_offset.should == 0
+          near_view.index_reverse.should be_false
+        end
+      end
     end
-
   end
-
 end