NoMethodError in StaticPages#home when attempting to list database query

Ruby noob here, I created a search form and I am trying to query a db and display the results. I am getting NoMethodError in StaticPages#home along with.... /home/action/Projects/CodonCoderTest5/app/views/static_pages/home.html.erb where line #4 raised:

undefined method `each' for nil:NilClass

Where am I going wrong?

layouts/StaticPages/home

<h1>StaticPages#home</h1>
<% @data_bases.each do |list| %>
     <div class="list">
         <h1 class="list-mrnaCodon"><%= link_to list.mrnaCodon %></h1>
     </div>
<% end %>

controller

class DataBaseController < ApplicationController

  def new
  end

  def index
       if params[:search]
          @data_base = Match.search(params[:search]).order("created_at DESC")
      else
          @data_base = Match.order("created_at DESC")
      end
    end

  def index
       @data_bases = Match.all
  end
end