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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 RemoveOrphanedRoutes < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
class Route < ActiveRecord::Base
self.table_name = 'routes'
include EachBatch
def self.orphaned_namespace_routes
where(source_type: 'Namespace')
.where('NOT EXISTS ( SELECT 1 FROM namespaces WHERE namespaces.id = routes.source_id )')
end
def self.orphaned_project_routes
where(source_type: 'Project')
.where('NOT EXISTS ( SELECT 1 FROM projects WHERE projects.id = routes.source_id )')
end
end
def up
# Some of these queries can take up to 10 seconds to run on GitLab.com,
# which is pretty close to our 15 second statement timeout. To ensure a
# smooth deployment procedure we disable the statement timeouts for this
# migration, just in case.
disable_statement_timeout do
# On GitLab.com there are around 4000 orphaned project routes, and around
# 150 orphaned namespace routes.
[
Route.orphaned_project_routes,
Route.orphaned_namespace_routes
].each do |relation|
relation.each_batch(of: 1_000) do |batch|
batch.delete_all
end
end
end
end
def down
# There is no way to restore orphaned routes, and this doesn't make any
# sense anyway.
end
end
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