from "Rails the Sinatra Way", deaf grandma not speaking to me!

index.html.erb

<div class="container">
  <h1>Deaf Grandma</h1>
  <% if @grandma %>
    <p>Grandma says: "<span id="grandma_says"><%= @grandma %></span>"</p>
  <% end %>
  
  <form action="/grandma" method="post">
    Say something to Grandma:
    <br>
    <input type="text" name="user_input">
    <input type="submit" value="Say it!">
  </form>
</div>

pages_controller.rb

class PagesController < ApplicationController
	def index
		@grandma = params[:grandma]
	end

	def show
		input = params[:user_input]
    if input == input.upcase && input != ""
      @grandma = "NOT SINCE 1983!"
    else
      @grandma = "SPEAK UP, SONNY!"
    end
    render :index
  end
end

routes.rb

LearningRails::Application.routes.draw do

  get '/' => 'pages#index'

  match '/grandma' => 'pages#show'

end