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PERF: improve performance of consistency query

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This commit is contained in:
Sam 2016-02-15 18:54:53 +11:00
parent 8e9a8472f4
commit 1f062ae2fd
1 changed files with 8 additions and 1 deletions
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9
app/models/category_user.rb
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@ -95,7 +95,14 @@ class CategoryUser < ActiveRecord::Base
end
def self.ensure_consistency!
exec_sql("DELETE FROM category_users WHERE user_id NOT IN (SELECT id FROM users)")
exec_sql <<SQL
DELETE FROM category_users
WHERE user_id IN (
SELECT cu.user_id FROM category_users cu
LEFT JOIN users u ON u.id = cu.user_id
WHERE u.id IS NULL
)
SQL
end
private_class_method :apply_default_to_topic, :remove_default_from_topic