show.html.erb

<div class="col-md-12 center-text">
  <h1><%= @stock.name %> (<%= @stock.symbol %>)</h1>
  <small>
    <% if signed_in? %>
        <%= link_to('Stocks list', stocks_path) %>
        <% if current_user.admin? %>
            <%= link_to '| Edit Stock', edit_stock_path(@stock), class: 'button' %>
            | <%= link_to 'Delete Stock', @stock,
                          method: :delete,
                          data: {confirm: 'Are you sure you want to permanently delete this stock?'},
                          class: 'button' %>
        <% end %>
    <% end %>
  </small>
</div>
<div class="row">
  <div class="col-xl-4">
    <div id="googlechart" class="col-md-6"></div>
    <%= render_chart @chart, 'googlechart' %>
  </div>
</div>
<div class="row">
  <div class="col-xl-2 small">
    <h4>Address</h4>
    <address><%= @stock.address %><br />
      <strong>Phone:</strong> <%= @stock.phone %><br />
      <strong>eMail:</strong> <%= @stock.email %><br />
      <strong>web:</strong>   <%= link_to(@stock.website, @stock.website, :target => "_blank" ) %>
    </address>
  </div>
  <div class="col-xl-6 small">
    <h4>Company Summary</h4>
    <%= @stock.profile %>
  </div>
  <div class="col-xl-4 small">
    <h4>Index Memberships</h4>
    <ul>
      <% @stock.indexes.each do |i| %>
          <dl><%= link_to(i.name, i) %></dl>
      <% end %>
    </ul>
  </div>
</div>


<% provide(:title, "Show Stock #{@stock.name}") %>

stocks_controller.rb

class StocksController < ApplicationController
  before_action :set_stock, except: [:index, :new, :create]

  def index
    @stocks = Stock.all
    respond_to do |format|
      format.html
      format.json { render json: StocksDatatable.new(view_context) }
    end
  end


  def show
    data_table = GoogleVisualr::DataTable.new
    # Add Column Headers
    data_table.new_column('date', 'Date' )
    data_table.new_column('number', 'Close')

    # Add Rows and Values
    data_table.add_rows(@stock.daily_prices.where('date > ?', 1.year.ago).pluck(:date, :close))
    option = { width: 400, height: 250, title: @stock.symbol, legend: {position: 'none'}, chartArea: {width: '80%'} }
    @chart = GoogleVisualr::Interactive::AreaChart.new(data_table, option)
  end


  def new
    @stock = Stock.new
  end


  def create
    @stock = Stock.new(stock_params)
    if @stock.save
      redirect_to stocks_url
    else
      render :new
    end
  end


  def edit
  end


  def update
    if @stock.update(stock_params)
      redirect_to @stock, notice: "Security successfully updated!"
    else
      render :edit
    end
  end


  def destroy
    @stock.destroy
    redirect_to stocks_url, notice: "Security successfully deleted!"
  end


  private

  def stock_params
    params.require(:stock).
        permit(:name, :symbol, :profile, :address, :phone, :email, :website)
  end

  def set_stock
    @stock = Stock.find(params[:id])
  end

end