Rails 3 模型关联。限制所选数据的数量
我有一个模范用户、一个提要和一条评论。用户有很多提要和评论，提要属于用户并有很多评论，最后评论属于用户和提要。
不，当我显示某个用户的提要时，它会选择每个提要迄今为止所做的所有评论。我希望它只选择过去 1 分钟内发表的评论，如果没有，我想显示最近的 2 条评论...我该怎么做？？？
I have a model user, a feed, and a comment. user has many feeds and comments, feeds belong to user and have many comments and finally comments belong to user and feed.
No when i show feeds for a certain user, it selects all the comments made till date for every feed. I want it to select only those comments that were made in the last 1 min, and if none were, i want to show the 2 most recent ones... how can i do that???
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