openproject/app/contracts/groups/base_contract.rb

#-- copyright
# OpenProject is an open source project management software.
# Copyright (C) 2012-2021 the OpenProject GmbH
#
# 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) 2006-2013 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.
#++

module Groups
  class BaseContract < ::ModelContract
    include RequiresAdminGuard

    # attribute_alias is broken in the sense
    # that `model#changed` includes only the non-aliased name
    # hence we need to put "lastname" as an attribute here
    attribute :name
    attribute :lastname

    validate :validate_unique_users

    private

    # Validating on the group_users since those are dealt with in the
    # corresponding services.
    def validate_unique_users
      user_ids = model.group_users.map(&:user_id)

      if user_ids.uniq.length < user_ids.length
        errors.add(:group_users, :taken)
      end
    end
  end
end