Using embedded associations in conjunction with only causes MissingAttributeError

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    • Type: Bug
    • Resolution: Unresolved
    • Priority: Unknown
    • None
    • Affects Version/s: 8.1.5
    • Component/s: Associations
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    • Ruby Drivers
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      If you use `.only` when fetching a model that embeds other models, then use the relation metadata to try to traverse back up from the embedded models, you get a missing attribute error

      This issue is not present in v6 or v7

      class Car
  include Mongoid::Document

  embeds_one :steering_wheel
end

class SteeringWheel
  include Mongoid::Document

  embedded_in :car
end

Car.collection.drop
id = BSON::ObjectId.new
Car.collection.insert_one "_id" => id, "steering_wheel" => \{ "_id" => BSON::ObjectId.new }
car = Car.where(id: id).only("_id", "steering_wheel._id").first
# 7.5 - works
# 8.1 - raises ActiveModel::MissingAttributeError
pp car.steering_wheel.car

              Assignee:
              Unassigned
              Reporter:
              Tapio Saarinen
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                Created:
                Updated: