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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class RemoveDuplicatesFromRoutes < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
def up
# We can skip this migration when running a PostgreSQL database because
# we use an optimized query in the "FillProjectsRoutesTable" migration
# to fill these values that avoid duplicate entries in the routes table.
return unless Gitlab::Database.mysql?
execute <<-EOF
DELETE duplicated_rows.*
FROM routes AS duplicated_rows
INNER JOIN (
SELECT path, MAX(id) as max_id
FROM routes
GROUP BY path
HAVING COUNT(*) > 1
) AS good_rows ON good_rows.path = duplicated_rows.path AND good_rows.max_id <> duplicated_rows.id;
EOF
end
def down
end
end
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