MongoError:事务中的读取首选项必须是主要的，而不是: secondaryPreferred

const { MongoClient } = require("mongodb");

async function runTransaction() {
  const uri = "mongodb://localhost:27017/mydatabase";
  const client = new MongoClient(uri);

  try {
    await client.connect();

    const session = client.startSession();

    const transactionOptions = {
      readPreference: "primary", // 设置读取首选项为主要
      readConcern: { level: "majority" },
      writeConcern: { w: "majority" },
    };

    session.startTransaction(transactionOptions);

    // 在事务中执行读取操作
    // ...

    await session.commitTransaction();
  } catch (error) {
    await session.abortTransaction();
    console.error("Transaction aborted:", error);
  } finally {
    session.endSession();
    await client.close();
  }
}

runTransaction().catch(console.error);