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class CreateLabelPriorities < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = true
DOWNTIME_REASON = 'Prioritezed labels will not work as expected until this migration is complete.'
disable_ddl_transaction!
def up
create_table :label_priorities do |t|
t.references :project, foreign_key: { on_delete: :cascade }, null: false
t.references :label, foreign_key: { on_delete: :cascade }, null: false
t.integer :priority, null: false
t.timestamps null: false
end
execute <<-EOF.strip_heredoc
INSERT INTO label_priorities (project_id, label_id, priority, created_at, updated_at)
SELECT labels.project_id, labels.id, labels.priority, NOW(), NOW()
FROM labels
WHERE labels.project_id IS NOT NULL
AND labels.priority IS NOT NULL;
EOF
add_concurrent_index :label_priorities, [:project_id, :label_id], unique: true
add_concurrent_index :label_priorities, :priority
remove_column :labels, :priority
end
def down
add_column :labels, :priority, :integer
if Gitlab::Database.mysql?
execute <<-EOF.strip_heredoc
UPDATE labels
INNER JOIN label_priorities ON labels.id = label_priorities.label_id AND labels.project_id = label_priorities.project_id
SET labels.priority = label_priorities.priority;
EOF
else
execute <<-EOF.strip_heredoc
UPDATE labels
SET priority = label_priorities.priority
FROM label_priorities
WHERE labels.id = label_priorities.label_id
AND labels.project_id = label_priorities.project_id;
EOF
end
add_concurrent_index :labels, :priority
drop_table :label_priorities
end
end
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