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class MigrateIssuesToGhostUser < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
class User < ActiveRecord::Base
self.table_name = 'users'
end
class Issue < ActiveRecord::Base
self.table_name = 'issues'
include ::EachBatch
end
def reset_column_in_migration_models
ActiveRecord::Base.clear_cache!
::User.reset_column_information
::Namespace.reset_column_information
end
def up
reset_column_in_migration_models
# we use the model method because rewriting it is too complicated and would require copying multiple methods
ghost_id = ::User.ghost.id
Issue.where('NOT EXISTS (?)', User.unscoped.select(1).where('issues.author_id = users.id')).each_batch do |relation|
relation.update_all(author_id: ghost_id)
end
end
def down
end
end
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