Anonymous identifiers for relationships (i.e. relationships not assigned to an identifier) are excluded from the model, and therefore also excluded from the serialised JSON.

Author: simonbrowndotje

structurizr-dsl/src/main/java/com/structurizr/dsl/StructurizrDslParser.java

@@ -1181,7 +1181,10 @@ void registerIdentifier(String identifier, Element element) {
 
     void registerIdentifier(String identifier, Relationship relationship) {
         identifiersRegister.register(identifier, relationship);
-        relationship.addProperty(STRUCTURIZR_DSL_IDENTIFIER_PROPERTY_NAME, identifiersRegister.findIdentifier(relationship));
+
+        if (!StringUtils.isNullOrEmpty(identifier)) {
+            relationship.addProperty(STRUCTURIZR_DSL_IDENTIFIER_PROPERTY_NAME, identifiersRegister.findIdentifier(relationship));
+        }
     }
 
     /**

structurizr-dsl/src/test/java/com/structurizr/dsl/DslTests.java

@@ -1007,6 +1007,20 @@ void test_identifiers() throws Exception {
         assertNull(impliedRelationship.getProperties().get("structurizr.dsl.identifier"));
     }
 
+    @Test
+    void test_relationshipWithoutIdentifier() throws Exception {
+        StructurizrDslParser parser = new StructurizrDslParser();
+        parser.parse(new File("src/test/resources/dsl/relationship-without-identifier.dsl"));
+
+        Workspace workspace = parser.getWorkspace();
+        IdentifiersRegister register = parser.getIdentifiersRegister();
+        assertEquals(1, workspace.getModel().getRelationships().size());
+        Relationship relationship = workspace.getModel().getRelationships().iterator().next();
+
+        assertTrue(register.findIdentifier(relationship).matches("[\\w]{8}-[\\w]{4}-[\\w]{4}-[\\w]{4}-[\\w]{12}"));
+        assertNull(relationship.getProperties().get("structurizr.dsl.identifier")); // identifier is not included in model
+    }
+
     @Test
     void test_imageViews_ViaFiles() throws Exception {
         StructurizrDslParser parser = new StructurizrDslParser();

structurizr-dsl/src/test/resources/dsl/relationship-without-identifier.dsl

@@ -0,0 +1,9 @@
+workspace {
+
+    model {
+        a = softwareSystem "A"
+        b = softwareSystem "B"
+        a -> b
+    }
+
+}