Append readPref() to a cursor to control how the client routes the query to members of the replica set.
| Parameter | Type | Description |
|---|---|---|
| mode | string | One of the following read preference modes: primary, primaryPreferred, secondary, secondaryPreferred, or nearest |
| tagSet | array | Optional. A tag set used to specify custom read preference modes. For details, see Tag Sets. |
Note
You must apply cursor.readPref() to the cursor before retrieving any documents from the database.