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95 lines
3.4 KiB
95 lines
3.4 KiB
#-- copyright
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# OpenProject is a project management system.
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# Copyright (C) 2012-2017 the OpenProject Foundation (OPF)
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License version 3.
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#
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# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
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# Copyright (C) 2006-2017 Jean-Philippe Lang
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# Copyright (C) 2010-2013 the ChiliProject Team
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# See doc/COPYRIGHT.rdoc for more details.
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#++
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module Concerns
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module VirtualAttribute
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extend ActiveSupport::Concern
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class_methods do
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def virtual_attribute(attribute, cast_type: :string, &block)
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attribute attribute, cast_type
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define_attribute_method attribute
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include InstanceMethods
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_define_virtual_attribute_setter(attribute)
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_define_virtual_attribute_getter(attribute, &block)
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_define_virtual_attribute_reload(attribute)
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end
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private
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def _define_virtual_attribute_setter(attribute)
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define_method "#{attribute}=" do |value|
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set_virtual_attribute(attribute, value) if send(attribute) != value
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instance_variable_set(:"@#{attribute}_set", true)
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instance_variable_set(:"@#{attribute}", value)
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end
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end
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def _define_virtual_attribute_getter(attribute, &block)
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define_method attribute do
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if instance_variable_get(:"@#{attribute}_set")
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instance_variable_get(:"@#{attribute}")
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else
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value = instance_eval(&block)
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set_virtual_attribute_was(attribute, value)
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instance_variable_set(:"@#{attribute}", value)
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end
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end
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end
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def _define_virtual_attribute_reload(attribute)
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define_method :reload do |*args|
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instance_variable_set(:"@#{attribute}", nil)
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instance_variable_set(:"@#{attribute}_set", nil)
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super(*args)
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end
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end
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end
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module InstanceMethods
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# Used to persists the changes to the virtual attribute in the mutation_tracker used by
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# AR::Dirty so that it looks like every other attribute.
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# Using attribute_will_change! does not place the value in the tracker but merely forces
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# the attribute to be returned when asking the object for changes.
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def set_virtual_attribute_was(attribute, value)
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attributes = mutation_tracker.send(:attributes)
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attributes[attribute.to_s].instance_variable_set(:@value_before_type_cast, value)
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end
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def set_virtual_attribute(attribute, value)
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attributes = mutation_tracker.send(:attributes)
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attributes[attribute.to_s] = attributes[attribute.to_s].with_value_from_user(value)
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end
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end
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end
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end
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