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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 DropDuplicateProtectedTags < ActiveRecord::Migration[4.2]
DOWNTIME = false
disable_ddl_transaction!
BATCH_SIZE = 1000
class Project < ActiveRecord::Base
self.table_name = 'projects'
include ::EachBatch
end
class ProtectedTag < ActiveRecord::Base
self.table_name = 'protected_tags'
end
def up
Project.each_batch(of: BATCH_SIZE) do |projects|
ids = ProtectedTag
.where(project_id: projects)
.group(:name, :project_id)
.select('max(id)')
tags = ProtectedTag
.where(project_id: projects)
.where.not(id: ids)
if Gitlab::Database.postgresql?
tags.delete_all
else
# Workaround needed for MySQL
sql = "SELECT id FROM (#{tags.to_sql}) protected_tags"
ProtectedTag.where("id IN (#{sql})").delete_all # rubocop:disable GitlabSecurity/SqlInjection
end
end
end
def down
end
end
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