openproject/db/migrate/20161025135400_query_empty_column_names_to_array.rb

#-- encoding: UTF-8
#-- copyright
# OpenProject is a project management system.
# Copyright (C) 2012-2018 the OpenProject Foundation (OPF)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
# Copyright (C) 2006-2017 Jean-Philippe Lang
# Copyright (C) 2010-2013 the ChiliProject Team
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
# See docs/COPYRIGHT.rdoc for more details.
#++

class QueryEmptyColumnNamesToArray < ActiveRecord::Migration[5.0]
  class QueryWithWhatever < ActiveRecord::Base
    self.table_name = :queries
    serialize :column_names
  end

  def up
    QueryWithWhatever.transaction do
      empty = QueryWithWhatever.where(column_names: '')
      null = QueryWithWhatever.where(column_names: nil)

      empty.or(null).update_all(column_names: [])
    end
  end

  # This migration does not need to be rolled back because
  # it only harmonizes the possible values of the value attribute.
end