testing read preference at transaction level

Author: jdaigneau5

src/controller/registry-org.controller/registry-org.controller.js

@@ -134,7 +134,7 @@ async function getOrg (req, res, next) {
  */
 async function createOrg (req, res, next) {
   try {
-    const session = await mongoose.startSession({ causalConsistency: false })
+    const session = await mongoose.startSession({ causalConsistency: false, readPreference: 'primary' })
     const repo = req.ctx.repositories.getBaseOrgRepository()
     const body = req.ctx.body
     const isSecretariat = await repo.isSecretariatByShortName(req.ctx.org, { session })

src/utils/db.js

@@ -26,7 +26,7 @@ function getMongoConnectionString () {
   logger.info(`Will try to connect to database ${dbName} at ${dbHost}:${dbPort}`)
 
   if (process.env.useAWS) {
-    return `mongodb://${dbLoginPrepend}${dbHost}:${dbPort}/${dbName}?retryWrites=false`
+    return `mongodb://${dbLoginPrepend}${dbHost}:${dbPort}/${dbName}?replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false`
   } else {
     return `mongodb://${dbLoginPrepend}${dbHost}:${dbPort}/${dbName}`
   }