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Type:
Task
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Resolution: Done
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Affects Version/s: None
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Component/s: None
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Labels:None
I'm using Mongoid 3.0.14, Moped 1.3.1, ruby-1.9.3-p392 on OS X – Lion.
When you have a has_many relationship and you find a child record and update it, when should the parent be updated in memory? Or is it never updated? I didn't find docs on this subject and the behavior didn't match my expectations.
Sample code:
Mongoid::Threaded.disable_identity_map(:all) # rule out identity map class Band include Mongoid::Document has_many :artists, autosave: true, validate: true, dependent: :destroy field :name, type: String end class Artist include Mongoid::Document belongs_to :band field :name, type: String field :age, type: Integer end Band.destroy_all Artist.destroy_all band = Band.new(name: "Beatles") artist = band.artists.find_or_initialize_by(name: "John", age: 24) band.save artist.save band.artists.first.age MONGOID-27 - correct artist = band.artists.find_or_initialize_by(name: "John") artist.age = 25 band.artists.first.age MONGOID-27 - correct, not yet persisted artist.save band.artists.first.age MONGOID-27 - incorrect, db now has 25 but traversing from parent yields stale data band.artists(true).first.age MONGOID-28 – works as expected after reload
By digging into the mongoid code I see that the way the getter is defined it will always return a stale artist reference unless an explicit reload is called. Is my understanding correct? Is that the expected behavior?