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# File 'lib/purgatory/active_record_descendant_attribute_accessors.rb', line 3
def self.attr_accessor_instance_variables(obj)
include_ancestor_methods = false
ancestors_before_active_record_base = obj.class.ancestors.take_while { |klass| klass != ActiveRecord::Base }
instance_methods_of_ancestors_before_active_record_base = ancestors_before_active_record_base
.map { |klass| klass.instance_methods(include_ancestor_methods) }
.flatten
setter_methods_of_ancestors_before_active_record_base = instance_methods_of_ancestors_before_active_record_base
.select { |meth| meth.to_s.last == '=' }
possible_instance_variables_from_setter_methods = setter_methods_of_ancestors_before_active_record_base
.map { |meth| meth.to_s.prepend('@').chop.to_sym }
obj.instance_variables & possible_instance_variables_from_setter_methods
end
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