move hard coded number to rake file

lib/tasks/kpis.rake

@@ -19,7 +19,7 @@ namespace :kpis do
     puts "*********************************************************************\n\n"
 
     courses.each do |c|
-      contributors = Content.prolific_metric({"course_id" => c})
+      contributors = Content.prolific_metric({"course_id" => c}, 10)
       #now output
       puts c
       puts "*********************"
@@ -46,7 +46,7 @@ namespace :kpis do
     puts "*********************************************************************\n\n"
 
     courses.each do |c|
-      contributors = Content.prolific_metric({"course_id" => c, "_type" => "CommentThread"})
+      contributors = Content.prolific_metric({"course_id" => c, "_type" => "CommentThread"}, 10)
       #now output
       puts c
       puts "*********************"
@@ -73,7 +73,7 @@ namespace :kpis do
 
     courses.each do |c|
       #first, get all the users who have contributed
-      contributors = Content.prolific_metric({"course_id" => c})
+      contributors = Content.prolific_metric({"course_id" => c}, 10)
       total_users = contributors.count
 
       #now, get the threads

models/content.rb

@@ -10,12 +10,10 @@ class Content
     end
   end
 
-  def self.prolific_metric what
+  def self.prolific_metric what, count
     #take a hash of criteria (what) and return a hash of hashes
     #course => user => count
 
-    count = 10
-
     contributors = {}
 
     map =  "function(){emit(this.author_id,1)}"