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barleysodas/app/models/page.rb

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##
# This is a representation of a page of the wiki. My wiki is awfully simple
# because i don't like too many features. This works and it has many different
# associations. All of the major models has_one of these and it belongs_to
# some kind of polymorphic owner.
#
# Bonuses:
# * Uses RedCloth markup.
# * Automatically converts/caches HTML
# * Allows any alphanumeric character or space in the name
# * Uses [[ and ]] for WikiWord representation.
#
class Page < ActiveRecord::Base
acts_as_versioned
acts_as_taggable
belongs_to :owner, :polymorphic => true
has_many :discussions, :order => 'discussions.created_at ASC',
:dependent => :destroy
belongs_to :created_by, :class_name => 'People', :foreign_key => 'created_by'
belongs_to :updated_by, :class_name => 'People', :foreign_key => 'updated_by'
validates_presence_of :title
validates_uniqueness_of :title, :scope => 'owner_type'
validates_format_of :title, :with => /^([A-Za-z0-9 ])+$/,
:message => 'may only contain letters, numbers and spaces'
before_save :update_html
before_create :set_created_person
before_save :set_updated_person
attr_protected :allow_discussions, :created_by, :updated_by
##
# Returns an url-friendly title for making links.
#
def title_for_url
self.title.gsub(/ /, '_')
end
##
# Gets a title from an url name.
#
def self.title_from_url(title)
title.to_s.gsub(/_/, ' ')
end
##
# Returns a list of Tag models for a type of Page.
#
# Can take options of :order, :limit, and :owner_type
#
def self.tags(options = {})
query = "select tags.id, name, count(*) as count"
query << " from tags_pages, tags, pages"
query << " where tags.id = tag_id"
if options[:owner_type].nil?
query << " and pages.owner_type IS NULL"
else
query << " and pages.owner_type = '#{options[:owner_type]}'"
end
query << " and tags_pages.page_id = pages.id"
query << " group by tags.id, tags.name"
query << " order by #{options[:order]}" if options[:order] != nil
query << " limit #{options[:limit]}" if options[:limit] != nil
tags = Tag.find_by_sql(query)
end
##
# Determines if a Page exists.
#
def self.exists?(page_name, owner_type = nil)
cond_ary = [
'title = :page_name'
]
cond_var = {
:page_name => page_name,
:owner_type => owner_type
}
if owner_type.nil? or owner_type == 'Page'
cond_ary << 'owner_type IS NULL'
else
cond_ary << 'owner_type = :owner_type'
end
self.count(:conditions => [ cond_ary.join(' AND '), cond_var ]) > 0
end
protected
##
# Sets the People marker for created_by on creation.
#
def set_created_person
self[:created_by] = ApplicationController.current_people_id rescue nil
self[:created_by] ||= People.penguincoder.id rescue nil
end
##
# Sets the People marker for updated_by on save.
#
def set_updated_person
self[:updated_by] = ApplicationController.current_people_id rescue nil
self[:updated_by] ||= People.penguincoder.id rescue nil
end
##
# Updates the HTML chunk from the RedCloth source.
#
def update_html
# need to filter HTML first... remove <script> and chunks and the like...
self.html = RedCloth.new(strip_tags(self.redcloth.to_s),
[ :no_span_caps ]).to_html(
# no link references. messes up lines starting with [[WikiWord]]
:block_textile_table, :block_textile_lists, :block_textile_prefix,
:inline_textile_image, :inline_textile_link, :inline_textile_code,
:inline_textile_span, :glyphs_textile)
end
##
# Removes HTML tags from a string
#
def strip_tags(str)
str.gsub(/\</, "&lt;").gsub(/\>/, "&gt;").gsub(/\&/, "&amp;")
end
end