update reference to postgres? in the migrations too

db/migrate/20110729045734_add_full_name_to_profile.rb

@@ -10,7 +10,7 @@ class AddFullNameToProfile < ActiveRecord::Migration
     remove_index :profiles, [:last_name, :searchable]
 
     if Profile.count > 0
-      if postgres? 
+      if AppConfig.postgres? 
         execute("UPDATE profiles SET full_name=LOWER(first_name || ' ' || last_name)")
       else
         execute("UPDATE profiles SET full_name=LOWER(CONCAT(first_name, ' ', last_name))")

db/migrate/20111011195702_share_anything.rb

@@ -2,7 +2,7 @@ class ShareAnything < ActiveRecord::Migration
   def self.up
     remove_foreign_key :aspect_visibilities, :posts
 
-    if postgres?
+    if AppConfig.postgres?
       execute "DROP INDEX index_aspect_visibilities_on_post_id_and_aspect_id"
       execute "DROP INDEX index_aspect_visibilities_on_post_id"
       execute "ALTER TABLE aspect_visibilities RENAME COLUMN post_id TO shareable_id"
@@ -46,7 +46,7 @@ class ShareAnything < ActiveRecord::Migration
     remove_foreign_key :post_visibilities, :posts
     rename_table :post_visibilities, :share_visibilities
 
-    if postgres?
+    if AppConfig.postgres?
       execute "DROP INDEX index_post_visibilities_on_contact_id_and_post_id"
       execute "DROP INDEX index_post_visibilities_on_post_id_and_hidden_and_contact_id"
       execute "ALTER TABLE share_visibilities RENAME COLUMN post_id TO shareable_id"

db/migrate/20111012215141_move_photos_to_their_own_table.rb

@@ -19,7 +19,7 @@ class MovePhotosToTheirOwnTable < ActiveRecord::Migration
       t.integer  "comments_count"
     end
 
-    if postgres?
+    if AppConfig.postgres?
       execute %{
         INSERT INTO photos (
             tmp_old_id
@@ -82,7 +82,7 @@ SQL
 
 
   def self.down
-    if postgres?
+    if AppConfig.postgres?
       execute %{
         INSERT INTO posts (
           id, author_id, public, diaspora_handle, guid, pending, type, text,

db/migrate/20111019013244_postgresql_photos_id_seq_init.rb

@@ -1,6 +1,6 @@
 class PostgresqlPhotosIdSeqInit < ActiveRecord::Migration
   def self.up
-    if postgres?
+    if AppConfig.postgres?
       execute "SELECT setval('photos_id_seq', COALESCE( ( SELECT MAX(id)+1 FROM photos ), 1 ) )"
     end
   end

db/migrate/20111023230730_fix_photo_share_visibilities.rb

@@ -4,7 +4,7 @@ class FixPhotoShareVisibilities < ActiveRecord::Migration
   def self.up
     return  if ! Photo.first.respond_to?(:tmp_old_id)
 
-    if postgres?
+    if AppConfig.postgres?
       ['aspect_visibilities', 'share_visibilities'].each do |vis_table|
         execute "UPDATE #{vis_table} SET shareable_type = 'Post'"
 

db/migrate/20111111025358_counter_cache_on_post_reshares.rb

@@ -4,7 +4,7 @@ class CounterCacheOnPostReshares < ActiveRecord::Migration
   def self.up
     add_column :posts, :reshares_count, :integer, :default => 0
 
-    if postgres?
+    if AppConfig.postgres?
       execute %{
         UPDATE posts
         SET reshares_count = (

db/migrate/20120202190701_remove_public_share_visibilities.rb

@@ -16,14 +16,14 @@ class RemovePublicShareVisibilities < ActiveRecord::Migration
       index = 0
 
       table_name = type.tableize
-      if postgres?
+      if AppConfig.postgres?
         shareable_size = ActiveRecord::Base.connection.execute("SELECT COUNT(*) FROM #{table_name}").first['count'].to_i
       else
         shareable_size = ActiveRecord::Base.connection.execute("SELECT COUNT(*) FROM #{table_name}").first.first
       end
 
       while index < shareable_size + 100 do
-        if postgres?
+        if AppConfig.postgres?
           sql = <<-SQL
             DELETE
               FROM share_visibilities AS sv