Create this Application

rails new fragen
cd fragen
rails g scaffold question question:string comments:text votes:integer
rake db:migrate
rails s

(edit root in config/routes.rb)

rm public/index.html
git init
git add .
git commit -m "initial commit"

Heroku (optional)

(edit Gemfile to use pg in production) (heroku toolbelt installieren: https://toolbelt.heroku.com)

heroku create
git push heroku master
heroku run rake db:migrate
heroku rename info3-questions
heroku open

Heroku

This app is available on Heroku http://info3-questions.herokuapp.com/

Add +1 Button

add named route in config/routes.rb:

match 'questions/:id/plusone' => 'questions#plusone', :as => :plusone

show routes with rake routes

add link in app/views/questions/index.html.erb:

<td><%= link_to ' +1 ', plusone_path(question) %></td>

click on it. you get complaint that controller action does not exist.

create it in app/controllers/question_controller.rb

def plusone
    @question = Question.find(request[:id])
    @question.votes = (@question.votes || 1) +1
    @question.save
  respond_to do |format|
    format.html { redirect_to questions_url, notice: "Plus one for '#{@question.   question}'."}
    format.json { render json: @questions }
  end
end

To see the notice in the index, you need to add this line:

<%= notice %>

Now, refactor: plusone should be a method of question: put it in app/models/question.rb and call it from the controller:

def plusone
  self.votes= (votes || 0) +1
end