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7677085
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0
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2011-10-06T15:58:47.710
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2011-10-06T21:31:41.780
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2011-10-06T21:31:41.780
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58061
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58061
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7676340
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2
Score
8
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text
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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: <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> 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: <pre><code>class User implements Serializable { String login static hasMany = [apps: Application] static constraints = { } static mapping = { id composite: ['login'] } } </code></pre> 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 implement Serializable. 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: <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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1. POString IDs in grails - how exactly can it be done?
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1. USjamesallman
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1. POString IDs in grails - how exactly can it be done?
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1. COthanks! I see you know about grails a lot. Can you explain me, why in this case using exists method of domain class throughs error?
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 USshabunc

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