It's relatively straightforward to use the hibernate validator api to apply JPA constraints:
import org.hibernate.validator.*; InvalidValue[] invalidValues = new ClassValidator(MyModel.class).getInvalidValues(instanceOfMyModel); This can also be done per-property; see the javadocs. I've done this locally; if folks would find it useful I'll contribute it to wicketstuff. -Clint On Tue, May 19, 2009 at 2:15 AM, Christian Helmbold <christian.helmb...@yahoo.de> wrote: > > How can I validate a unique constraint with Wicket? Because only the value of > an input field is passed to onValidate(IValidatable validatable), there is no > chance to check if this value belongs to a specific object to update or if it > would violate a unique constraint when creating a new object. onValidate > would need another paremeter for the related object. > > I see two possibilities: > > a) Use a form validator and get the related model object from the form. > > b) Pass the related object to the constructor of the Validator. I'm not sure, > if the validator would be recreated any time the model object changes. > > I would prefer a validator tied to the field and not to the form, because > that would be more intuitive. > > Another idea is to use existing JPA annotations. @Column(unique=true) is > already there but not used for validation (outside the database). Perhaps > there is a way to use this annotation. I really like the domain level > validation of Grails: http://grails.org/doc/1.1/guide/7.%20Validation.html > > How would you validate a unique constraint with wicket? > > Thanks in advance > Christian > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org > For additional commands, e-mail: users-h...@wicket.apache.org > > -- Clint Popetz http://42lines.net Scalable Web Application Development --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
