HelgeKrueger opened a new issue, #14654:
URL: https://github.com/apache/grails-core/issues/14654
Consider the domain object:
``` groovy
class Cookie {
String name
static constraints = {
name nullable: false, blank: true, unique: true
}
}
```
Then the following test passes although it shouldn't.
``` groovy
class CookieSpec extends IntegrationSpec {
def 'validation fails'() {
setup:
def cookie = new Cookie()
def sameCookie = new Cookie()
cookie.name = ''
sameCookie.name = ''
Cookie.withTransaction{
cookie.save()
}
expect:
sameCookie.validate()
}
}
```
One cannot set the name to the empty string in the Cookie constructor as it
would then yield null due to the data binding mechanism.
## Note
Not checking the unique constraint is the correct behavior for the null
value, see https://jira.grails.org/browse/GRAILS-10403. At least for MySQL
databases forcing the empty string to be a unique value would be consistent
with the database behavior.
## Workaround
One can use a custom validator, which in our example would be
``` groovy
class Cookie {
String name
static constraints = {
name nullable: false, blank: true, validator: { val, obj -> !
Cookie.findByName(obj.name) }
}
}
```
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