Prerequisites

Basic Ruby/Rails knowledge, including an installed version of Ruby 1.9.2, Rubygems, Bundler, and Rails 3.
Basic Git knowledge, including an installed version of Git.
Create a Heroku account http://www.heroku.com/
All the commands work on linux

1# Install the Heroku client:


$ gem install heroku


2# Write Your App

You may be starting from an existing app from http://dl.dropbox.com/u/261809/clothes_recommender.tar.gz. If not you can create your own


$ rails new myapp
$ cd myapp


3# Edit your Gemfile and change the line:

group :production do
gem 'pg'
end

group :development, :test do
gem 'sqlite3'
end

gem 'httparty'



4# Install Gems


$ bundle install --without production


5# Store Your App in Git


$ git init
$ git add .
$ git commit -m "init"


6# Deploy to Heroku/Cedar

Create the app on the Cedar stack:

$ heroku create --stack cedar


7# Creating the recommender:

* Create the models

create file app/models/google_weather.rb


class GoogleWeather
include HTTParty
base_uri "www.google.com"

attr_reader :long , :lat

def initialize(options)
@long = options[:long].to_f*1000000
@lat = options[:lat].to_f*1000000
end

def weather
@weather ||= self.class.get("/ig/api", :query => {:weather => ",,,#{@lat.to_i},#{@long.to_i}"}, :format => :xml)
end

def current_condition
@current_condition ||=@weather['xml_api_reply']['weather']['current_conditions']["condition"]["data"]
end

def current_temp
@current_temp ||= @weather['xml_api_reply']['weather']['current_conditions']["temp_f"]["data"]
end

def current_icon
@current_icon ||= "http://www.google.com/#{@weather['xml_api_reply']['weather']['current_conditions']["icon"]["data"]}"
end

def tomorrow_condition
@tomorrow_condition||=@weather['xml_api_reply']['weather']['forecast_conditions'][1]["condition"]["data"]
end

def tomorrow_high
@tomorrow_high||=@weather['xml_api_reply']['weather']['forecast_conditions'][1]["high"]["data"]
end

def tomorrow_low
@tomorrow_low||=@weather['xml_api_reply']['weather']['forecast_conditions'][1]["low"]["data"]
end

def tomorrow_avgtemp
@tomorrow_avgtemp||=(tomorrow_low.to_i+tomorrow_high.to_i)/2
end
end



create file app/models/clothes_recommender.rb


class ClothesRecommender

def self.get_recommendation(lat,long)
response={}
options={:lat=>lat,:long=>long}
gw=GoogleWeather.new(options)
gw.weather
response[:display_text]="Today's weather is #{gw.current_condition} at #{gw.current_temp}F, we recommend #{lookup(gw.current_condition,gw.current_temp)}"
response[:icon]=gw.current_icon
response
end

def self.lookup(condition,temp)
case condition.downcase
when "overcast"
return "you to carry an umberellea or rain coat"
when "rain"
return "not to forget your umberellea/rain coat"
when "mostly sunny"
return "take your umberellea/rain coat"
when "partly sunny"
return "Place holder text"
when "mostly cloudy"
return "Place holder text"
when "partly cloudy"
return "Place holder text"
when "clear"
return "Place holder text"
when "chance of rain"
return "Place holder text"
when "cloudy"
return "Place holder text"
end
case temp.to_i
when 81..100
return "you to wear light cotton clothing and bottle of water"
when 51..80
return "you to wear pants with a top and a lighter jacket"
when 41..50
return "you to take lighter jacket with you"
when 20..40
return "Place holder text"
when 0..30
return "Place holder text"
end
end
end


* Create controller

create file app/controller/recommender_controller.rb


class RecommenderController < ApplicationController

def index
@recommendations= ClothesRecommender.get_recommendation(params[:latitude].to_f,params[:longitude].to_f)
@recommendations[:details_url]="http://#{request.host_with_port}/recommender/details?latitude=#{params[:latitude]},longitude=#{params[:longitude]}"
end

def details
options={:lat=>params[:latitude],:long => params[:longitude]}
@gw=GoogleWeather.new(options)
@gw.weather
@today="Today's weather is #{@gw.current_condition} at #{@gw.current_temp}F, we recommend #{ClothesRecommender.lookup(@gw.current_condition,@gw.current_temp)}"
@tomorrow="Tomorrow's forecast #{@gw.tomorrow_condition} with High at #{@gw.tomorrow_high}F and Low at #{@gw.tomorrow_low}F, we recommend #{ClothesRecommender.lookup(@gw.tomorrow_condition,@gw.tomorrow_avgtemp)}"
end

end


* Create the views

Today:

<%=@today%>

Tomorrow:

<%=@tomorrow%>

* Create xml builder

xml.instruct!
xml.dev_expert do
xml.display_text "#{@recommendations[:display_text]}"
xml.icon_hdpi_url "#{@recommendations[:icon]}"
xml.icon_mdpi_url "#{@recommendations[:icon]}"
xml.icon_ldpi_url "#{@recommendations[:icon]}"
xml.details_view_url "#{@recommendations[:details_url]}"
end



8# Deploy your code:

$ git push heroku master

When prompted for your heroku user name and password please enter

Read more: http://feeds.dzone.com/~r/dzone/snippets/~3/JjF1ADUg3gg/13965