When using PgBouncer, there are certain considerations to take into account:

• If you're using transaction pooling mode, prepared statements must be disabled.
• If you're using transaction pooling mode, session level features should not be used.

This is a light layer above the PostgreSQL connection adapter, that helps ensure that you don't make the mistakes above!

Add this line to your application's Gemfile:

gem 'activerecord-pgbouncer'

This adds a pgbouncer adapter, which you can use in config/database.yml or ENV['DATABASE_URL']:

production:
  adapter: pgbouncer
  pooling_mode: transaction # Can be `session`, `transaction`, or `statement`

export DATABASE_URL=pgbouncer://user:pass@host/db?pooling_mode=transaction