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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?
select_all("SELECT path FROM #{quote_table_name(:routes)} GROUP BY path HAVING COUNT(*) > 1").each do |row|
path = connection.quote(row['path'])
execute(%Q{
DELETE FROM #{quote_table_name(:routes)}
WHERE path = #{path}
AND id != (
SELECT id FROM (
SELECT max(id) AS id
FROM #{quote_table_name(:routes)}
WHERE path = #{path}
) max_ids
)
})
end
end
def down
end
end
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