[jboss-user] [JBoss Seam] - Best practice for creating reference entity for entity creat
awhitford
do-not-reply at jboss.com
Fri Feb 9 23:30:38 EST 2007
I used seam-gen from 1.1.6 GA to create a reverse-engineered project. I have a table with a self join. (Note that in order to use generate-entities, I had to drop the foreign key constraint, then I doctored the generated project a bit to restore the object relationship.) My entity looks something like:
| @Entity
| public class Currency implements Serializable
| {
| private static final long serialVersionUID = 1L;
|
| /** ISO 4217 Currency Code */
| @Id
| @Column(columnDefinition = "char(3)", length = 3)
| @NotNull
| @Length(min = 3, max = 3)
| private String code;
|
| /** Currency name (English) */
| @Column(length = 40, nullable = false, unique = true)
| @NotEmpty
| @Length(max = 40)
| private String name;
|
| /** Rank for sorting */
| @Column(nullable = false)
| @NotNull
| private int sortRank;
|
| /**
| * Replacement Currency. For example pre-Euro currencies would have EUR specified.
| */
| @ManyToOne
| private Currency replacementCurrency;
|
| /**
| * Replacement Date is the date that the currency was replaced. For example,
| * the date when the currency was converted to EUR.
| */
| @Temporal(TemporalType.DATE)
| private Date replacementDate;
| ...
| }
|
So on the CurrencyEdit.xhtml page, there is code like:
| <tr class="prop">
| <td class="name">Replacement Currency</td>
| <td class="value">
| <s:decorate>
| <h:inputText id="replacementCurrency"
| size="3"
| maxlength="3"
| value="#{currencyHome.instance.replacementCurrency}"/>
| </s:decorate>
| </td>
| </tr>
|
|
Of course, when I try to save, I get an argument type mismatch error:
anonymous wrote :
| CurrencyEdit.xhtml @85,96 value="#{currencyHome.instance.replacementCurrency}": Exception setting property replacementCurrency of base with class com.mycompany.reference.iso.Currency, Bean: com.mycompany.reference.iso.Currency, property: replacementCurrency, argument type mismatch
|
The form only is accepting a String, which is the PK of Currency, but not a Currency object. Clearly, I need to use that String key to find the object instance, and then assign that to the object being edited... Anybody have an example?
I can imagine the code to do this, but I am really wondering what the best practice is. Can I use the CurrencyHome or CurrencyList object in some fashion, or do I need to create another bean?
(I am a little surprised that I couldn't find an example in the Seam documentation.)
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