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barleysodas/lib/has_one_page.rb

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module ActiveRecord # :nodoc:
class Base # :nodoc:
class << self
##
# This method will add a has_one :page association and a few useful
# callbacks to the requested model. It expects to have a
# :owner_class parameter given so that it knows what the owner class
# name should be. The associated model will automatically be deleted
# when this model is deleted.
#
# The Page will automatically have the title updated from the owner's
# title field and be saved after a successful save. When a Page errors
# on validation, the errors are automatically copied into the owner so
# that the user doesn't even have to know what is going on.
#
def has_one_tuxwiki_page(options = {})
return if self.included_modules.include?(TuxWiki::HasOnePage)
send :include, TuxWiki::HasOnePage
# we need a class name for right now. i don't know how to inflect it
# on my own, yet.
options[:owner_class] ||= 'Page'
class_eval do
has_one :page, :foreign_key => 'owner_id', :dependent => :destroy,
:conditions => "pages.owner_type = '#{options[:owner_class]}'",
:include => 'tags'
before_save :ensure_tuxwiki_page_valid
after_save :save_tuxwiki_page
end
end
end
end
end
module TuxWiki # :nodoc:
module HasOnePage # :nodoc:
protected
##
# This model always has a Page associated. Save it before this
# model to make sure that everything is kosher with the name and
# whatnot.
#
def save_tuxwiki_page
self.page.save
end
##
# This will let the Page model keep track of names being unique and
# all. Might be nil, so let the after_save hook create it. Also
# copies the errors from the page model into the owner model.
#
def ensure_tuxwiki_page_valid
if self.page.nil?
self.errors.add(:page, "is missing")
else
self.page.owner = self
self.page.title = self.title
self.page.errors.each do |key, val|
self.errors.add(key, val)
end if !self.page.valid?
end
return false if self.errors.size > 0
true
end
end
end