server.rb

require "sinatra"
require "csv"
require "shotgun"

before do
  @players = []
  CSV.foreach('lackp_starting_rosters.csv', headers: true, header_converters: :symbol) do |row|
    @players << {
      name: row[0] + ' ' + row[1], position: row[2], team_name: row[3]
    }
  end

  players
end

get '/' do
  erb :index
end

get '/teams/:team_name' do
  @player = @players.find do |player|
    player[:team_name] == params[:team_name]
  end
  erb :team
end