Undo some pg changes

Gemfile

 source 'http://rubygems.org'
 
-#gem 'mysql2', '0.2.6'
-gem 'pg'
+gem 'mysql2', '0.2.6'
+#gem 'pg'
 gem 'rails', '3.0.3'
 gem 'foreigner', '0.9.1'
 

Gemfile.lock

@@ -226,6 +226,7 @@ GEM
     multi_json (1.0.3)
     multi_xml (0.2.2)
     multipart-post (1.1.2)
+    mysql2 (0.2.6)
     net-ldap (0.2.2)
     net-scp (1.0.4)
       net-ssh (>= 1.99.1)
@@ -282,7 +283,6 @@ GEM
       oa-openid (= 0.2.6)
     open4 (1.0.1)
     orm_adapter (0.0.5)
-    pg (0.11.0)
     polyglot (0.3.1)
     pyu-ruby-sasl (0.0.3.3)
     rack (1.2.3)
@@ -430,11 +430,11 @@ DEPENDENCIES
   linecache (= 0.43)
   mini_magick (= 3.2)
   mongrel
+  mysql2 (= 0.2.6)
   newrelic_rpm
   nokogiri
   ohai (= 0.5.8)
   omniauth (= 0.2.6)
-  pg
   rails (= 3.0.3)
   rcov
   resque (= 1.10.0)

db/migrate/20110328202414_post_visibilities_on_contacts.rb

 class PostVisibilitiesOnContacts < ActiveRecord::Migration
+  class PostVisibility < ActiveRecord::Base; end
   def self.move_author_pvs_to_aspect_pvs
     where_clause = <<SQL
       FROM post_visibilities as pv
@@ -57,11 +58,7 @@ SQL
   end
 
   def self.pv_count
-    @pv_count ||= lambda {
-      count = execute('SELECT count(*) FROM post_visibilities').to_a.first.first
-      count = count.last.to_i if self.connection.class == ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
-      count
-    }.call
+    @pv_count ||= PostVisibility.count
   end
 
   def self.up

db/schema.rb

@@ -81,7 +81,7 @@ ActiveRecord::Schema.define(:version => 20110606192307) do
     t.datetime "updated_at"
   end
 
-  add_index "conversation_visibilities", ["conversation_id", "person_id"], :name => "index_conversation_visibilities_on_everything", :unique => true
+  add_index "conversation_visibilities", ["conversation_id", "person_id"], :name => "index_conversation_visibilities_on_conversation_id_and_person_id", :unique => true
   add_index "conversation_visibilities", ["conversation_id"], :name => "index_conversation_visibilities_on_conversation_id"
   add_index "conversation_visibilities", ["person_id"], :name => "index_conversation_visibilities_on_person_id"
 
@@ -93,6 +93,8 @@ ActiveRecord::Schema.define(:version => 20110606192307) do
     t.datetime "updated_at"
   end
 
+  add_index "conversations", ["author_id"], :name => "conversations_author_id_fk"
+
   create_table "invitations", :force => true do |t|
     t.text     "message"
     t.integer  "sender_id",    :null => false
@@ -117,6 +119,7 @@ ActiveRecord::Schema.define(:version => 20110606192307) do
     t.datetime "updated_at"
   end
 
+  add_index "likes", ["author_id"], :name => "likes_author_id_fk"
   add_index "likes", ["guid"], :name => "index_likes_on_guid", :unique => true
   add_index "likes", ["post_id"], :name => "index_likes_on_post_id"
 
@@ -141,6 +144,7 @@ ActiveRecord::Schema.define(:version => 20110606192307) do
   end
 
   add_index "messages", ["author_id"], :name => "index_messages_on_author_id"
+  add_index "messages", ["conversation_id"], :name => "messages_conversation_id_fk"
 
   create_table "notification_actors", :force => true do |t|
     t.integer  "notification_id"