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Bajena/gist:e80d3b6293490d02fe68c9a28c67fa04

Last active January 27, 2019 21:21
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gistfile1.rb
posts = Post.where(id: [1, 2, 3])
# SELECT * FROM posts WHERE id IN (1, 2, 3)
users = posts.map { |post| post.user }
# SELECT * FROM users WHERE id = 1
# SELECT * FROM users WHERE id = 2
# SELECT * FROM users WHERE id = 3
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