Created
January 27, 2019 21:23
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Rails includes
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| 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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