12 lines
383 B
Ruby
12 lines
383 B
Ruby
class AddLastPostedAtToUsers < ActiveRecord::Migration
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def change
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add_column :users, :last_posted_at, :datetime, null: true
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add_index :users, :last_posted_at
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execute "UPDATE users
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SET last_posted_at = (SELECT MAX(posts.created_at)
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FROM posts
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WHERE posts.user_id = users.id)"
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end
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end
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