Rails ActiveRecord n+1 问题 多次 includes 同一个表
Unknow user
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July 15, 2016
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Last by u1370743666 replied at July 18, 2016
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1952 hits
[4] pry(main)> Item.includes(:creator).includes(:worker)
Item Load (0.5ms) SELECT "items".* FROM "items"
User Load (0.4ms) SELECT "users".* FROM "users" WHERE "users"."id" IN (1, 2)
User Load (0.6ms) SELECT "users".* FROM "users" WHERE "users"."id" IN (1, 2)
2,3 查询语句可以优化成一个吗？还是说只能手动收集 user_ids
