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我正在使用 Ruby on Rails 3.2.2，我想知道是否可以在“运行”/“加载”时检索到的每条记录上运行一个方法，以便仅“保留”/“返回”那些记录该方法返回，直到那些是 5。也就是说，我有：ActiveRecord::Relationtrue 

class Comment < ActiveRecord::Base
  def method_name
    # return 'true' or 'false'
  end
end

# The '<...>' in the below code could / should be stated to run the 'method_name'
# on each comment and keep those comments for which 'method_name' returns 'true' 
# until the count of retrieved comments is 5.
Comment.where(:published => true).<...> 
Comment.<...>
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