Incongruency with #pluck with localized fields on loaded relations vs. scopes

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    • Type: Bug
    • Resolution: Duplicate
    • Priority: Major - P3
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      1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?
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      There is currently an issue where #pluck with localized fields behaves differently on relation scopes which are loaded in memory vs. queried from the database.

      The reason is because loaded scopes (e.g. a loaded has_many relation) are instances of Mongoid::Association::Referenced::*::Enumerable, which delegate to Enumerable#pluck.

      Conversely, query scopes are instances of Mongoid::Criteria, which use Mongoid::Contextual::Mongo#pluck.

      The fix should be to ensure that the Mongoid::Criteria behavior prevails in all cases.

      The below example illustrates the surprising behavior:

       

      class Person
  include Mongoid::Document

  has_many :dogs
end

class Dog
  include Mongoid::Document

  field :name, localize: true
  field :color
  belongs_to :person
end

# wrong!
Person.dogs.class #=> Mongoid::Association::Referenced::HasMany::Enumerable
Person.dogs.pluck(:name) #=> [{"en" => "Fido", "fr" => "Fideaux"}]
Person.dogs.pluck(:name_translations) #=> [nil]

# correct/expected
Person.dogs.where(color: :red) #=> Mongoid::Criteria
Person.dogs.where(color: :red).pluck(:name) #=> ["Fido"]
Person.dogs.where(color: :red).pluck(:name_translations) #=> [{"en" => "Fido", "fr" => "Fideaux"}]

       

       

            Assignee:
            Jamis Buck
            Reporter:
            Johnny Shields
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              Created:
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