Reducing database access.

app/helpers/graph_helper.rb

@@ -4,8 +4,7 @@ module GraphHelper
     refs += commit.refs.collect{|r|r.name}.join(" ") if commit.refs
     # append note count
-    notes = @project.notes.for_commit_id(commit.id)
-    refs += "[#{notes.count}]" if notes.any?
+    refs += "[#{@graph.notes[commit.id]}]" if @graph.notes[commit.id] > 0
     refs
   end

app/models/network/graph.rb

@@ -2,7 +2,7 @@ require "grit"
 module Network
   class Graph
-    attr_reader :days, :commits, :map
+    attr_reader :days, :commits, :map, :notes
     def self.max_count
       @max_count ||= 650
@@ -16,10 +16,19 @@ module Network
       @commits = collect_commits
       @days = index_commits
+      @notes = collect_notes
     end
     protected
+    def collect_notes
+      h = Hash.new(0)
+      @project.notes.where('noteable_type = ?' ,"Commit").group('notes.commit_id').select('notes.commit_id, count(notes.id) as note_count').each do |item|
+        h[item["commit_id"]] = item["note_count"]
+      end
+      h
+    end
+
     # Get commits from repository
     #
     def collect_commits