Ruby on rails 3-如果是，则将+1加到稍后打印出的变量上

<% @variable_with_counts = 0 %>
<% games.each do |game|%>
  <% if game_is_true?(game.id) %>
    <% @variable_with_counts += 1 %>
  <% end %>
<% end %>

<%= @variable_with_counts %>

<%= games.all.count {|game| game_is_true? game.id } %>

class Game << ActiveRecord::Base

  def is_true?
    game_is_true? self.id # or whatever evaluates this
  end

end

<%= games.all.count {|game| game.is_true? } %>