Migrate old membership objects to new Member model

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

db/migrate/20140914145549_migrate_to_newmembers_model.rb

+class MigrateToNewmembersModel < ActiveRecord::Migration
+  def up
+    UsersGroup.find_each(batch_size: 500) do |user_group|
+      GroupMember.create(
+        user_id: user_group.user_id,
+        source_type: 'Group',
+        source_id: user_group.group_id,
+        access_level: user_group.group_access,
+        notification_level: user_group.notification_level,
+      )
+
+      print '.'
+    end
+
+    UsersProject.find_each(batch_size: 500) do |user_project|
+      ProjectMember.create(
+        user_id: user_project.user_id,
+        source_type: 'Project',
+        source_id: user_project.project_id,
+        access_level: user_project.project_access,
+        notification_level: user_project.notification_level,
+      )
+
+      print '.'
+    end
+  end
+
+  def down
+    Member.destroy_all
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
-ActiveRecord::Schema.define(version: 20140914113604) do
+ActiveRecord::Schema.define(version: 20140914145549) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"