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copied!<p>When you use a natural id you have to use the <a href="http://grails.org/doc/latest/ref/Domain%20Classes/findBy.html" rel="noreferrer">findBy</a> method instead of the <a href="http://grails.org/doc/latest/ref/Domain%20Classes/get.html" rel="noreferrer">get</a> method as demonstrated in this test:</p> <pre><code>def user = new User(login: "test") assertNotNull user.save(flush: true) user = User.findByLogin("test") assertNotNull user assertEquals "test", user.login </code></pre> <p>Alternately you could use a single field <a href="http://grails.org/doc/latest/guide/5.%20Object%20Relational%20Mapping%20%28GORM%29.html#5.5.2.5%20Composite%20Primary%20Keys" rel="noreferrer">composite id</a> mapping:</p> <pre><code>class User implements Serializable { String login static hasMany = [apps: Application] static constraints = { } static mapping = { id composite: ['login'] } } </code></pre> <p>Note that <a href="http://grails.org/doc/latest/guide/5.%20Object%20Relational%20Mapping%20%28GORM%29.html#5.5.2.5%20Composite%20Primary%20Keys" rel="noreferrer">composite id</a> domain classes are required to <em>implement Serializable</em>.</p> <p>The test for the <a href="http://grails.org/doc/latest/guide/5.%20Object%20Relational%20Mapping%20%28GORM%29.html#5.5.2.5%20Composite%20Primary%20Keys" rel="noreferrer">composite id</a> would be:</p> <pre><code>def user = new User(login: "test") assertNotNull user.save(flush: true) user = User.get(new User(login: "test")) assertNotNull user assertEquals "test", user.login </code></pre>

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