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@ -132,6 +132,10 @@ they be XGen::Mongo::Driver::ObjectID instances.)
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The database itself inserts an _id value if none is specified when a record is
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inserted.
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The driver automatically sends the _id field to the database first, which is
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how Mongo likes it. You don't have to worry about where the _id field is in
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your hash record, or worry if you are using an OrderedHash or not.
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=== Primary Key Factories
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A primary key factory is a class you supply to a DB object that knows how to
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