club_info_contents.rb

class ClubInfoContents    
  def initialize(club)    
    @club = club
  end

  def title
    return "Congratulations! #{@club.name}" if @club.valid_member_count?
    return @club.name
  end

  def notice
    if @club.valid_member_count?
      ''
    else
      "You haven't met the member requirements."
    end
  end
  
  def body
    ->(view_context) { view_context.render partial: 'club_info', locals: { club: @club } }
  end
end

show.html.erb

<%= @club_view.title %>
<%= @club_view.notice %>
<%= @club_view.body.call(self) %>