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class Node < ActiveRecord::Base
acts_as_nested_set
has_many :pages, :order => "revision ASC"
belongs_to :head, :class_name => "Page", :foreign_key => :head_id
# Callbacks
after_create :initialize_empty_page
# Class methods
# Returns a page for a given node. If no revision is supplied, it returns
# the last / current one. If a specific revision number is supplied, the
# corresponding revision of that page is returned. Get the current / latest
# revision with -1. It raises an Argument error if the revision is not a
# Fixnum
def self.find_page path, revision = -1
unless revision.class == Fixnum
raise ArgumentError, "revision must be a Fixnum"
end
node = Node.find_by_unique_name(path)
if node
case revision
when -1
return node.head
else
return node.pages.find_by_revision revision
end
end
nil
end
# Instance Methods
def draft
# check if there is a page which has a nil :published_at column
# if there is one - it is considered a draft else a new revision is
# created
if draft = pages.find_by_published_at(nil)
draft
else
# make a new fresh page with node reference
draft = Page.create( head.attributes )
end
draft
end
def publish_draft!
self.head = self.draft
self.save!
self.head.published_at = Time.now
self.head.save!
end
# returns an array with all parts of a unique_name rather than a string
def unique_path
unique_name.split("/") rescue unique_name
end
# returns array with pages up to root excluding root
def path_to_root
parent.nil? && [slug] || parent.path_to_root.push(slug)
end
def update_unique_name
path = self.path_to_root[1..-1]
self.unique_name = path.join("/")
self.save
end
protected
# Creates an empty page, associates it to the given node and sets its
# published_at date so it isn't considered a draft. Look up the draft
# method!
def initialize_empty_page
if self.pages.empty?
self.pages.create!
end
end
end
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