view db/migrate/008_create_user_preferences.rb @ 1087:74407a04925c issue_540

* (publication.rb) - fixed the acts_as_activity query (see diff to previous commit) - not returning duplicate results any longer; added the visible scope to the publication model;
* (init.rb) - created a new public permission - view_publication.

class CreateUserPreferences < ActiveRecord::Migration
  def self.up
    create_table :user_preferences do |t|
      t.column "user_id", :integer, :default => 0, :null => false
      t.column "others", :text
    end
  end

  def self.down
    drop_table :user_preferences
  end
end