use level instead of depth

Rakefile

@@ -26,14 +26,14 @@ namespace :db do
     CommentThread.delete_all
     Vote.delete_all
     User.delete_all
-    depth_limit = YAML.load_file("config/application.yml")["depth_limit"]
+    level_limit = YAML.load_file("config/application.yml")["level_limit"]
     (1..3).each do |question_id|
       comment_thread = CommentThread.create! :commentable_type => "questions", :commentable_id => question_id
       5.times do
         comment_thread.root_comments.create :body => "top comment", :title => "top #{rand(10)}", :user_id => 1, :course_id => 1, :comment_thread_id => comment_thread.id
       end
       10.times do
-        comment = Comment.all.reject{|c| c.is_root? or c.depth - 1 >= depth_limit or c.comment_thread_id != comment_thread.id}.sample
+        comment = Comment.all.reject{|c| c.is_root? or c.depth  >= level_limit or c.comment_thread_id != comment_thread.id}.sample
         comment.children.create :body => "comment body", :title => "comment title #{rand(50)}", :user_id => 1, :course_id => 1, :comment_thread_id => comment_thread.id
       end
     end