notebook/app/controllers/languages_controller.rb

class LanguagesController < ApplicationController
  before_filter :redirect_if_not_logged_in
  before_filter :require_ownership_of_language, :only => [:show, :edit, :destroy]

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

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

  def show
    @language = Language.find(params[:id])

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

  def new
    @language = Language.new

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

  def edit
    @language = Language.find(params[:id])
  end

  def create
    @language = Language.new(params[:language])
    @language.user_id = session[:user]

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

  def update
    @language = Language.find(params[:id])

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

  def destroy
    @language = Language.find(params[:id])
    @language.destroy

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