notebook/app/controllers/sessions_controller.rb

class SessionsController < ApplicationController
  # GET /sessions
  # GET /sessions.json
  def index
    @sessions = Session.all

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

  # GET /sessions/1
  # GET /sessions/1.json
  def show
    @session = Session.find(params[:id])

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

  # GET /sessions/new
  # GET /sessions/new.json
  def new
    @session = Session.new

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

  # GET /sessions/1/edit
  def edit
    @session = Session.find(params[:id])
  end

  # POST /sessions
  # POST /sessions.json
  def create
    login = Session.new(params[:session])
    
    user = User.where(name: login.username, password: login.password)
    if user.length < 1
      throw "Invalid username or password. Please try again."
    end
    
    session[:user] = user[0].id
      
    respond_to do |format|
      format.html { redirect_to '/', notice: 'Login successful.' }
      format.json { render json: true, status: :created, location: login }
	  end

  end

  # PUT /sessions/1
  # PUT /sessions/1.json
  def update
    @session = Session.find(params[:id])

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

  # DELETE /sessions/1
  # DELETE /sessions/1.json
  def destroy
    session.delete(:user)

    respond_to do |format|
      format.html { redirect_to '/', notice: 'Logged out!' }
      format.json { head :no_content }
    end
  end
end