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deepakmahakale/N-plus-1-queries-log-1.rb

Created March 22, 2019 07:24
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N-plus-1-queries-log-1.rb
User.all.map do |user|
[user.name, user.posts.map(&:title).join(', ')]
end
User Load (0.3ms) SELECT "users".* FROM "users"
Post Load (0.4ms) SELECT "posts".* FROM "posts" WHERE "posts"."user_id" = ? [["user_id", 1]]
Post Load (0.2ms) SELECT "posts".* FROM "posts" WHERE "posts"."user_id" = ? [["user_id", 2]]
Post Load (0.1ms) SELECT "posts".* FROM "posts" WHERE "posts"."user_id" = ? [["user_id", 3]]
#=> [["Jack", "post-1, post-2"], ["Adam", "post-3, post-3"], ["John", "post-5, post-6"]]
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