openproject/app/models/concerns/tableless.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 COPYRIGHT and LICENSE files for more details.
#++

module Tableless
  extend ActiveSupport::Concern

  def persisted?
    false
  end

  class_methods do
    def attribute_names
      @attribute_names ||= attribute_types.keys
    end

    def load_schema!
      @columns_hash ||= Hash.new

      # From active_record/attributes.rb
      attributes_to_define_after_schema_loads.each do |name, (type, options)|
        if type.is_a?(Symbol)
          type = ActiveRecord::Type.lookup(type, **options.except(:default))
        end

        define_attribute(name, type, **options.slice(:default))

        # Improve Model#inspect output
        @columns_hash[name.to_s] = ActiveRecord::ConnectionAdapters::Column.new(name.to_s, options[:default])
      end
    end
  end
end