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Consider the following scenario with MongoDB:
Three writers (A,B,C) insert a document into the same collection.
A inserts first, followed by B, followed by C.
How can we guarantee A retrieves the ObjectId of the document he inserted and not B’s document or C’s document? Do we need to serialize the writes (i.e., only permit B to write after A inserts and retrieves the ObjectId), or does MongoDB offer some native functionality for this scenario?
Thanks!
We’re on Rails.
the normal pattern here is for the driver to allocate the ObjectId and then you know what it is for the insert even before the server gets it.