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Bajena/gist:f58850727f8aeeb107fc24d68cbffef9

Created January 27, 2019 21:23
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Rails includes
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gistfile1.rb
posts = Post.where(id: [1, 2, 3]).includes(:user)
# SELECT * FROM posts WHERE id IN (1, 2, 3)
# SELECT * FROM users WHERE id IN (1, 2, 3)
users = posts.map { |post| post.user }
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