module Extra
	CODING_HTML = 0
	CODING_BBCODE = 1
	CODING_MARKDOWN = 2

	def check_params params, filter
		(params.instance_of?(Array) ? params : params.keys).each do |key|
      return false unless filter.include? key.to_sym
    end
    return true
	end

	def error_messages
		self.errors.full_messages.uniq
	end

	def codings
		{CODING_HTML => "Plain HTML", CODING_BBCODE => "BBCode", CODING_MARKDOWN => "Markdown"}
	end

	def move_up scope, column = "position"
		n = 0
		objects = self.class.all :conditions => scope, :order => column
		objects.each do |item|
			if item.id == id and n > 0
				old_position = item.read_attribute :column
				item.update_attribute column, objects.fetch(n-1).read_attribute(:column)
				objects.fetch(n-1).update_attribute column, old_position
			end
			n = n + 1
		end
	end

	def move_down scope, column = "position"
		n = 0
		objects = self.class.all :conditions => scope, :order => column
		objects.each do |item|
			if item.id == id and n < (objects.length-1)
				old_position = item.read_attribute :column
				item.update_attribute column, objects.fetch(n+1).read_attribute(:column)
				objects.fetch(n+1).update_attribute column, old_position
			end
			n = n + 1
		end
  end

	def can_show? cuser
		true
	end

	def can_create? cuser
		true
	end

	def can_update? cuser
		true
	end

	def can_destroy? cuser
		true
	end
end