SWIFT-143: ReadPreference option for core classes and operations #86
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https://jira.mongodb.org/browse/SWIFT-143
I believe this covers all of the relevant helper methods currently in the driver:
MongoDatabase.runCommand()MongoCollection.aggregate()MongoCollection.count()MongoCollection.distinct()MongoCollection.find()Per the database, collection, and index enumeration specs, those operations must be executed on a primary server (unless connected to a secondary in standalone mode). In any event, they do not use a read preference.