0fc9f9d3e7
DB schema generated by a migration may look different in rails 4 and 5 (because rails 5 may use different default values). For this reason it's important to explicitly set for which rails version a migration was written for. See https://stackoverflow.com/questions/35929869/activerecordmigration-deprecation-warning-asks-for-rails-version-but-im-no/35930912#35930912
33 lines
1.4 KiB
Ruby
33 lines
1.4 KiB
Ruby
# rubocop:disable RemoveIndex
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class AddUniqueIndexToLabels < ActiveRecord::Migration[4.2]
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include Gitlab::Database::MigrationHelpers
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DOWNTIME = true
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DOWNTIME_REASON = 'This migration removes duplicated labels.'
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disable_ddl_transaction!
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def up
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select_all('SELECT title, project_id, COUNT(id) as cnt FROM labels GROUP BY project_id, title HAVING COUNT(id) > 1').each do |label|
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label_title = quote_string(label['title'])
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duplicated_ids = select_all("SELECT id FROM labels WHERE project_id = #{label['project_id']} AND title = '#{label_title}' ORDER BY id ASC").map { |label| label['id'] }
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label_id = duplicated_ids.first
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duplicated_ids.delete(label_id)
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execute("UPDATE label_links SET label_id = #{label_id} WHERE label_id IN(#{duplicated_ids.join(",")})")
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execute("DELETE FROM labels WHERE id IN(#{duplicated_ids.join(",")})")
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end
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remove_index :labels, column: :project_id if index_exists?(:labels, :project_id)
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remove_index :labels, column: :title if index_exists?(:labels, :title)
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add_concurrent_index :labels, [:group_id, :project_id, :title], unique: true
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end
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def down
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remove_index :labels, column: [:group_id, :project_id, :title] if index_exists?(:labels, [:group_id, :project_id, :title], unique: true)
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add_concurrent_index :labels, :project_id
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add_concurrent_index :labels, :title
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end
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end
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