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Type:
Bug
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Resolution: Works as Designed
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Priority:
Minor - P4
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None
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Affects Version/s: 1.12.0
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Component/s: Bulk API
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None
In go.mod:
go.mongodb.org/mongo-driver v1.12.0
Example code:
type Model struct { ID uint64 `bson:"_id"` Data string `bson:"data"` } func UpdateMany(ctx context.Context, coll *mongo.Collection, models []Model) error { update := make([]mongo.WriteModel, 0, len(models)) for _, model := range models { update = append(update, mongo.NewUpdateOneModel(). SetFilter(bson.D{{"_id", model.ID}}). SetUpdate(bson.D{{"$set", model}}), ) } _, err := coll.BulkWrite(ctx, update) return err }
Error when calling UpdateMany:
bulk write exception: write errors: [Performing an update on the path '_id' would modify the immutable field '_id']
If running the same query from mongosh there will be no error, also if ID field will have complex type (for example struct with 2 fields) - also no error