Rails 对 Mongoid max 查询输出的消息有点不明白
loyalpartner
·
February 26, 2015
·
1476 hits
rails 版本：4.2.0 mongid: 4.0.0
当我执行 Category.all.max(:updated_at) rails 控制台输出
MOPED: 127.0.0.1:27017 COMMAND database=mongoid_study_development command={:aggregate=>"categories", :pipeline=>[{"$match"=>{"updated_at"=>{"$nin"=>[nil]}}}, {"$group"=>{"_id"=>"updated_at", "count"=>{"$sum"=>1}, "max"=>{"$max"=>"$updated_at"}, "min"=>{"$min"=>"$updated_at"}, "sum"=>{"$sum"=>"$updated_at"}, "avg"=>{"$avg"=>"$updated_at"}}}]} runtime: 1.2388ms
为什么我执行的是 max，控制台却给了我一堆 min,avg etc.
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