Eager loading means that Rails will automatically perform the necessary queries to load the object of any specified child objects.
立即加载意味着Rails将自动执行所需的查询来加载任何特定子对象的对象。
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Iverson swears he’s had his fill of carrying the load during his 11 NBA seasons and is eager to serve as wingman to the 22-year-old Anthony—and he showed it the first chance he got.
Essentially, because Rails reloads child records generated by parent records, you need to eager-load the parent records as if they were an entirely separate relationship.