Add meta field indicating if an item has a prior version

build/pom.xml

@@ -3,7 +3,7 @@
     <parent>
         <groupId>eu.ehri-project</groupId>
         <artifactId>ehri-data</artifactId>
-        <version>0.15.4</version>
+        <version>0.15.5</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>build</artifactId>

ehri-cli/pom.xml

@@ -4,7 +4,7 @@
     <parent>
         <groupId>eu.ehri-project</groupId>
         <artifactId>ehri-data</artifactId>
-        <version>0.15.4</version>
+        <version>0.15.5</version>
     </parent>
     <artifactId>ehri-cli</artifactId>
     <name>Command Line Tools</name>

ehri-core/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>eu.ehri-project</groupId>
         <artifactId>ehri-data</artifactId>
-        <version>0.15.4</version>
+        <version>0.15.5</version>
     </parent>
     <artifactId>ehri-core</artifactId>
     <packaging>jar</packaging>

ehri-core/src/main/java/eu/ehri/project/models/base/Versioned.java

@@ -25,13 +25,28 @@
 import com.tinkerpop.frames.modules.javahandler.JavaHandler;
 import com.tinkerpop.frames.modules.javahandler.JavaHandlerContext;
 import eu.ehri.project.definitions.Ontology;
+import eu.ehri.project.models.annotations.Meta;
 import eu.ehri.project.models.events.Version;
 import eu.ehri.project.models.utils.JavaHandlerUtils;
 
+import static eu.ehri.project.models.utils.JavaHandlerUtils.hasEdge;
+
 /**
  * An entity that may have prior versions.
  */
 public interface Versioned extends Accessible {
+    String IS_VERSIONED = "isVersioned";
+
+
+    /**
+     * Determine if this item has a prior version.
+     *
+     * @return true, if a prior version exists.
+     */
+    @Meta(IS_VERSIONED)
+    @JavaHandler
+    boolean isVersioned();
+
     /**
      * Get the most recent version for this item, if one exists.
      *
@@ -54,5 +69,10 @@ public Iterable<Version> getAllPriorVersions() {
             return frameVertices(gremlin().as("n").out(Ontology.ENTITY_HAS_PRIOR_VERSION)
                     .loop("n", JavaHandlerUtils.noopLoopFunc, JavaHandlerUtils.noopLoopFunc));
         }
+
+        @Override
+        public boolean isVersioned() {
+            return hasEdge(it(), Direction.OUT, Ontology.ENTITY_HAS_PRIOR_VERSION);
+        }
     }
 }

ehri-core/src/test/java/eu/ehri/project/models/events/VersionTest.java

@@ -55,6 +55,8 @@ public void testVersioning() throws Exception {
                 EventTypes.creation).commit();
         assertEquals(1, Iterables.size(first.getSubjects()));
 
+        assertFalse(user.isVersioned());
+
         // Change the user twice in succession, with the data from userBundle2
         // and userBundle3
         SystemEvent second = actionManager.newEventContext(user,
@@ -73,6 +75,9 @@ public void testVersioning() throws Exception {
         Mutation<UserProfile> update2 = bundleManager.update(userBundle3, UserProfile.class);
         assertEquals(MutationState.UPDATED, update2.getState());
 
+        // Ensure isVersioned works
+        assertTrue(user.isVersioned());
+
         // Now compare the values in the versions
         Version firstVersion = second.getPriorVersions().iterator().next();
         assertEquals(second, firstVersion.getTriggeringEvent());

ehri-cypher/pom.xml

@@ -3,7 +3,7 @@
     <parent>
         <artifactId>ehri-data</artifactId>
         <groupId>eu.ehri-project</groupId>
-        <version>0.15.4</version>
+        <version>0.15.5</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 

ehri-definitions/pom.xml

@@ -3,7 +3,7 @@
     <parent>
         <groupId>eu.ehri-project</groupId>
         <artifactId>ehri-data</artifactId>
-        <version>0.15.4</version>
+        <version>0.15.5</version>
         <relativePath>..</relativePath>
     </parent>
     <artifactId>ehri-definitions</artifactId>

ehri-io/pom.xml

@@ -4,7 +4,7 @@
     <parent>
         <groupId>eu.ehri-project</groupId>
         <artifactId>ehri-data</artifactId>
-        <version>0.15.4</version>
+        <version>0.15.5</version>
     </parent>
     <artifactId>ehri-io</artifactId>
 

ehri-ws-graphql/pom.xml

@@ -3,7 +3,7 @@
     <parent>
         <artifactId>ehri-data</artifactId>
         <groupId>eu.ehri-project</groupId>
-        <version>0.15.4</version>
+        <version>0.15.5</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 

ehri-ws-oaipmh/pom.xml

@@ -3,7 +3,7 @@
     <parent>
         <artifactId>ehri-data</artifactId>
         <groupId>eu.ehri-project</groupId>
-        <version>0.15.4</version>
+        <version>0.15.5</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 

ehri-ws/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <groupId>eu.ehri-project</groupId>
         <artifactId>ehri-data</artifactId>
-        <version>0.15.4</version>
+        <version>0.15.5</version>
     </parent>
     <artifactId>ehri-ws</artifactId>
     <name>Web Service</name>

pom.xml

@@ -5,7 +5,7 @@
 
     <groupId>eu.ehri-project</groupId>
     <artifactId>ehri-data</artifactId>
-    <version>0.15.4</version>
+    <version>0.15.5</version>
     <packaging>pom</packaging>
 
     <name>EHRI Backend</name>