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# File 'lib/elasticsearch/model/extensions/outer_document_updating.rb', line 123
def shortest_path(from:, to:, visited_classes: nil)
visited_classes ||= []
current_class = from
destination_class = to
paths = []
current_class.reflect_on_all_associations.each do |association_found|
next if association_found.options[:polymorphic]
key = association_found.name
begin
klass = association_found.class_name.constantize
rescue => e
warn "#{e.message} while reflecting #{current_class.name}\##{key}\n#{e.backtrace[0...1].join("\n")}"
next
end
next if visited_classes.include? association_found.class_name
if klass == destination_class
return [key]
else
suffix_found = shortest_path(
from: klass,
to: destination_class,
visited_classes: visited_classes.append(association_found.class_name)
)
if suffix_found
paths << [key] + suffix_found
end
end
end
if paths.empty?
nil
else
paths.min_by { |path| path.size }
end
end
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