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Code Issues 10 Releases Wiki Activity

Fix n+1 query in settings migration (#24783)

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Eugen Rochko 2023-05-02 10:26:39 +02:00 committed by GitHub
parent f1c1fa1411
commit 0ad2413b35
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1 changed files with 16 additions and 13 deletions
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db/migrate/20230215074423_move_user_settings.rb
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@ -59,9 +59,11 @@ class MoveUserSettings < ActiveRecord::Migration[6.1]
end
def up
User.find_each do |user|
previous_settings = LegacySetting.where(thing_type: 'User', thing_id: user.id).index_by(&:var)
User.find_in_batches do |users|
previous_settings_for_batch = LegacySetting.where(thing_type: 'User', thing_id: users.map(&:id)).group_by(&:thing_id)
users.each do |user|
previous_settings = previous_settings_for_batch[user.id]&.index_by(&:var) || {}
user_settings = {}
MAPPING.each do |legacy_key, new_key|
@ -81,6 +83,7 @@ class MoveUserSettings < ActiveRecord::Migration[6.1]
user.update_column('settings', Oj.dump(user_settings)) # rubocop:disable Rails/SkipsModelValidations
end
end
end
def down; end
end