annotate db/migrate/095_add_wiki_pages_parent_id.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 AddWikiPagesParentId < ActiveRecord::Migration
  def self.up
    add_column :wiki_pages, :parent_id, :integer, :default => nil
  end

  def self.down
    remove_column :wiki_pages, :parent_id
  end
end