class Player < ActiveRecord::Base
  has_and_belongs_to_many :teams
end

class Team < ActiveRecord::Base
  has_and_belongs_to_many :players
end

def players
  @players = Player.all
end

<%@players.each do |player|%>
    <tr>
      <td><%= link_to "Add", "steam://friends/add/#{player.steamid}"%></td>
      <td><%= link_to player.name, player%></td>
      <td><%=player.email%></td>
      <td><%=player.teams.teamname%></td>
    </tr>
<%end%>

@players = Player.includes(:teams).all