openproject/lib/associations_mapper.rb

#-- copyright
# OpenProject is a project management system.
# Copyright (C) 2012-2014 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) 2006-2013 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 doc/COPYRIGHT.rdoc for more details.
#++

module AssociationsMapper
  def self.included(base)
    base.extend(ClassMethods)
  end

  module ClassMethods
    # this allows you to set project=4711. which then dos a lookup
    def map_associations_for(*association_names)
      association_names.each do |association_name|
        if reflection = reflect_on_association(association_name)
          class_eval %{
            def #{association_name}_with_map_associations_for=(new_value)
              if new_value.present? && new_value.is_a?(Hash) && new_value.has_key?(:id)
                obj = #{reflection.klass.name}.find_by_id(new_value[:id])

                if obj.present?
                  self.#{association_name}_without_accepts_nested_attributes_for_apis = obj
                else
                  @errors_in_nested_attributes ||= {}
                  @errors_in_nested_attributes[:#{association_name}] = [:invalid]
                end
              else
                self.#{association_name}_without_map_associations_for = new_value
              end
            end
            alias_method_chain :#{association_name}=, :map_associations_for


          }, __FILE__, __LINE__
        else
          raise ArgumentError, "No association found for name `#{association_name}'. Has it been defined yet?"
        end
      end
      include Validations
    end
  end

  module Validations
    def validate
      if @errors_in_nested_attributes.present?
        @errors_in_nested_attributes.each do |attribute, errs|
          errs.each do |error|
            errors.add attribute, error
          end
        end
      end
      super
    end
  end
end