notebook/app/controllers/locations_controller.rb

class LocationsController < ApplicationController
  before_filter :redirect_if_not_logged_in
  before_filter :require_ownership_of_location, :only => [:show, :edit, :destroy]

  def index
  	@locations = Location.where(user_id: session[:user])
    
    if @locations.size == 0
      @locations = []
    end
    
		@locations = @locations.sort { |a, b| a.name.downcase <=> b.name.downcase }

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @locations }
    end
  end

  def show
    @location = Location.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @location }
    end
  end

  def new
    @location = Location.new

    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @location }
    end
  end

  def edit
    @location = Location.find(params[:id])
  end

  def create
    @location = Location.new(params[:location])
    @location.user_id = session[:user]

    respond_to do |format|
      if @location.save
        format.html { redirect_to @location, notice: 'Location was successfully created.' }
        format.json { render json: @location, status: :created, location: @location }
      else
        format.html { render action: "new" }
        format.json { render json: @location.errors, status: :unprocessable_entity }
      end
    end
  end

  def update
    @location = Location.find(params[:id])

    respond_to do |format|
      if @location.update_attributes(params[:location])
        format.html { redirect_to @location, notice: 'Location was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: "edit" }
        format.json { render json: @location.errors, status: :unprocessable_entity }
      end
    end
  end

  def destroy
    @location = Location.find(params[:id])
    @location.destroy

    respond_to do |format|
      format.html { redirect_to location_list_url }
      format.json { head :no_content }
    end
  end
end