build_portfolio.rb

  def build_portfolio
    # preparing portfolio data for charts
    stocks, eps, pm, industries, price_performance = [], [], [], {}, []

    Portfolio.first.portfolio_companies.each do |pc|
      # create arrays from data
      stocks << pc.company.symbol if pc.company.symbol
      eps << pc.company.diluted_eps if pc.company.diluted_eps
      pm << (pc.company.profit_margin*100).round(1) if pc.company.profit_margin

      if pc.company.industry
        # if the industry is already in there, increase its value by one
        industries.include?(pc.company.industry) ?
            industries[pc.company.industry]+=1 : industries[pc.company.industry]=1
      end
      
      price_performance << {
          :name=>pc.company.symbol,
          :data=> pc.company.returns
      }
    end

    # parse to percentage the number of times an industry is in the portfolio
    companies_total = stocks.count
    industries.keys.each { |k| industries[k]=industries[k]*100/companies_total }

    render :json => {:message          =>"OK",
                     :stocks           =>stocks,
                     :eps              => eps,
                     :pm               => pm,
                     :diversification  => industries.to_a, #array of [key, value]
                     :price_performance=>price_performance
    }
  end