Configuring Grails for postgres

DataSource.groovy

dataSource {
    pooled = true
    jmxExport = true
    driverClassName = "org.postgresql.Driver"
    dialect = org.hibernate.dialect.PostgreSQLDialect
    uri = new URI(System.env.DATABASE_URL)
    username = uri.userInfo ? uri.userInfo.split(":")[0] : ""
    password = uri.userInfo ? uri.userInfo.split(":")[1] : ""
    url = "jdbc:postgresql://" + uri.host + uri.path
}
hibernate {
    cache.use_second_level_cache = true
    cache.use_query_cache = false
    cache.region.factory_class = 'org.hibernate.cache.ehcache.EhCacheRegionFactory' // Hibernate 4
    singleSession = true // configure OSIV singleSession mode
    flush.mode = 'manual' // OSIV session flush mode outside of transactional context
}

// environment specific settings
environments {
    development {
        dataSource {
            dbCreate = "create-drop" // one of 'create', 'create-drop', 'update', 'validate', ''
        }
    }
    test {
        dataSource {
            dbCreate = "update"
        }
    }
    production {
        dataSource {
            dbCreate = "update"
        }
    }
}