test dynamic ui hidden annotation

Author: etimr

app/admin/fiori-service.cds

@@ -39,10 +39,11 @@ annotate AdminService.Books with @(UI : {
         },
         {   
             // TODO: should work dynamically
-            @UI.Hidden,
             $Type  : 'UI.ReferenceFacet',
             Label  : '{i18n>Contents}',
-            Target : 'contents/@UI.PresentationVariant'
+            Target : 'contents/@UI.PresentationVariant',
+            ![@UI.Hidden] : contentsHidden 
+
         }
     ],
     FieldGroup #General : {Data : [

db/books.cds

@@ -23,6 +23,7 @@ entity Books : cuid, managed {
                        on reviews.book = $self;
     isReviewable : TechnicalBooleanFlag not null default true;
     contents     : Composition of many Contents on contents.book = $self @odata.contained:false;
+    virtual contentsHidden : Boolean default false;
 }
 
 entity Authors : cuid, managed {

srv/src/main/java/my/bookshop/handlers/SetHiddenHandler.java

@@ -0,0 +1,38 @@
+package my.bookshop.handlers;
+
+
+import java.util.List;
+import java.util.Map;
+
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Component;
+
+import com.sap.cds.services.EventContext;
+import com.sap.cds.services.handler.EventHandler;
+import com.sap.cds.services.handler.annotations.After;
+import com.sap.cds.services.handler.annotations.On;
+import com.sap.cds.services.handler.annotations.ServiceName;
+
+import cds.gen.adminservice.AdminService_;
+import cds.gen.adminservice.Books_;
+
+@Component
+@ServiceName(AdminService_.CDS_NAME)
+/**
+ * Example of a custom handler for nextSiblingAction
+ */
+@Profile("hybrid")
+public class SetHiddenHandler implements EventHandler {
+
+    @After(entity = Books_.CDS_NAME)   
+    void removeUIHidden(EventContext context){
+        Object result = context.get("result");
+        if (result instanceof Map row) {
+            row.put("contentsHidden", true);
+        } else if (result instanceof List rows && rows.size() == 1) {
+            ((Map)rows.get(0)).put("contentsHidden", true);
+        }
+    }
+}
+
+