app.rb

# -*- encoding : utf-8 -*-

require 'sinatra'
require 'csv'

set :csvfile, 'fakedata.csv'

before do
  @contacts = []
  CSV.parse(File.read(settings.csvfile), headers: :first_row).each do |row|
    @contacts << row.to_hash
  end

end

helpers do

  def get_and_show_id(arr)
    id = arr.shift
    sprintf('<td><a href="/contacts/%d">%d</a></td>', id, id)
  end

  def save_csv(contacts)
    CSV.open(settings.csvfile ,'wb') do |csv|
      csv << contacts.first.keys
      contacts.each do |h|
        csv << h.values
      end
    end
  end

end

get '/' do
  redirect '/contacts'
end

get '/contacts' do
  @headers = @contacts.first.keys
  if params[:name_like]
    @contacts = @contacts.select{|contact| contact["name"].include?(params[:name_like])  }
  end
  erb :index
end

post '/contacts' do
  params[:contact]["created_on"] = Time.now.strftime('%Y/%m/%d')
  @new_contact = {}
  @contacts.first.keys.each do |k|
    @new_contact[k] = params[:contact][k]
  end
  @new_contact["id"] = @contacts.max{|a,b| a["id"].to_i <=> b["id"].to_i  }["id"].to_i + 1
  @contacts << @new_contact
  save_csv @contacts
  redirect '/contacts'
end

get '/contacts/new' do
  @contact = {}
  @action = '/contacts'
  erb :form
end


before %r{\/contacts\/(\d+).*} do
  @contact = @contacts.select{|contact| contact["id"] == params[:captures].first}
  not_found if @contact.empty?
  @contact = @contact.first
end

put '/contacts/:id' do
  @contacts[params[:id].to_i - 1].merge! params[:contact]
  save_csv(@contacts)
  redirect '/contacts'
end

get '/contacts/:id/edit' do
  @action = "/contacts/#{@contact['id']}"
  @method = :put
  erb :form
end

get '/contacts/:id' do
  erb :show
end

delete '/contacts/:id' do
  @contacts.delete_if{|c| c["id"] == params[:id] }
  save_csv @contacts
  redirect '/contacts'
end