added an index to root_id

app/models/post.rb

@@ -46,6 +46,10 @@ class Post < ActiveRecord::Base
     end
   end
 
+  def reshare_count
+    @reshare_count ||= Post.where(:root_guid => self.guid).count
+  end
+
   def diaspora_handle= nd
     self.author = Person.where(:diaspora_handle => nd).first
     write_attribute(:diaspora_handle, nd)

app/views/reshares/_reshare.haml

@@ -16,7 +16,7 @@
             %span.timeago
               = link_to(how_long_ago(post), post_path(post))
             –
-            = t("reshares.reshare.reshare", :count => post.reshares.size)
+            = t("reshares.reshare.reshare", :count => post.reshare_count)
 
       - if post.activity_streams?
         = link_to image_tag(post.image_url, 'data-small-photo' => post.image_url, 'data-full-photo' => post.image_url, :class => 'stream-photo'), post.object_url, :class => "stream-photo-link"

db/migrate/20110930182048_add_root_guid_index_to_posts.rb

@@ -0,0 +1,9 @@
+class AddRootGuidIndexToPosts < ActiveRecord::Migration
+  def self.up
+    add_index :posts, :root_guid
+  end
+
+  def self.down
+    remove_index :posts, :column => :root_guid
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20110926120220) do
+ActiveRecord::Schema.define(:version => 20110930182048) do
 
   create_table "aspect_memberships", :force => true do |t|
     t.integer  "aspect_id",  :null => false
@@ -287,6 +287,7 @@ ActiveRecord::Schema.define(:version => 20110926120220) do
 
   add_index "posts", ["author_id"], :name => "index_posts_on_person_id"
   add_index "posts", ["guid"], :name => "index_posts_on_guid", :unique => true
+  add_index "posts", ["root_guid"], :name => "index_posts_on_root_guid"
   add_index "posts", ["status_message_guid", "pending"], :name => "index_posts_on_status_message_guid_and_pending"
   add_index "posts", ["status_message_guid"], :name => "index_posts_on_status_message_guid"
   add_index "posts", ["type", "pending", "id"], :name => "index_posts_on_type_and_pending_and_id"