growstuff/app/controllers/notifications_controller.rb

class NotificationsController < ApplicationController
  load_and_authorize_resource
  # GET /notifications
  def index
    @notifications = Notification.find_all_by_recipient_id(current_member)

    respond_to do |format|
      format.html # index.html.erb
    end
  end

  # GET /notifications/1
  def show
    @notification = Notification.find(params[:id])
    @notification.read = true
    @notification.save

    # by default, reply link sends a PM in return
    @reply_link = new_notification_path(
      :recipient_id => @notification.sender.id,
      :subject => @notification.subject =~ /^Re: / ?
        @notification.subject :
        "Re: " + @notification.subject
    )

    if @notification.post
      # comment on the post in question
      @reply_link = new_comment_path(:post_id => @notification.post.id)
    end

    respond_to do |format|
      format.html # show.html.erb
    end
  end

  # GET /notifications/new

  def new
    @notification = Notification.new
    @recipient = Member.find_by_id(params[:recipient_id])
    @subject   = params[:subject] || ""

    respond_to do |format|
      format.html # new.html.erb
    end
  end

  # DELETE /notifications/1
  def destroy
    @notification = Notification.find(params[:id])
    @notification.destroy

    respond_to do |format|
      format.html { redirect_to notifications_url }
    end
  end

  # POST /notifications
  def create
    params[:notification][:sender_id] = current_member.id
    @notification = Notification.new(params[:notification])
    @recipient = Member.find_by_id(params[:notification][:recipient_id])

    respond_to do |format|
      if @notification.save
        format.html { redirect_to notifications_path, notice: 'Message was successfully sent.' }
      else
        format.html { render action: "new" }
      end
    end
  end
end