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I have 3 PostgreSQL (9.1) server's, 1 master and 2 slave. I have configured streaming replication between them. Now when i shutdown the primary server and convert one of the slave to act as primary ( using the trigger ), the recovery.conf is changed to recovery.done.

Now my problem is while using rails application with postgres the replication works fine, But when there is change in primary i.e a slave is promoted to primary the rails app does not know that. What gem should I use to resolve this, so that the rails app will know the change in primary. And how should the config must be done.

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