[Normalizer] Copy the title field when creating the ArraySchema object in processNormalize31Spec (#22592)

* Copy the title field when creating the ArraySchema object in processNormalize31Spec()

* Copy the title field when creating the ArraySchema object in processNormalize31Spec()

Author: lucy66hw

modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java

@@ -860,7 +860,7 @@ protected void normalizeProperties(Map<String, Schema> properties, Set<Schema> v
         }
         for (Map.Entry<String, Schema> propertiesEntry : properties.entrySet()) {
             Schema property = propertiesEntry.getValue();
-            
+
             // remove x-internal if needed (same logic as normalizeComponentsSchemas)
             if (property.getExtensions() != null && getRule(REMOVE_X_INTERNAL)) {
                 Object xInternalValue = property.getExtensions().get(X_INTERNAL);
@@ -1777,6 +1777,7 @@ protected Schema processNormalize31Spec(Schema schema, Set<Schema> visitedSchema
                 ArraySchema as = new ArraySchema();
                 as.setDescription(schema.getDescription());
                 as.setDefault(schema.getDefault());
+                as.setTitle(schema.getTitle());
                 if (schema.getExample() != null) {
                     as.setExample(schema.getExample());
                 }

modules/openapi-generator/src/test/java/org/openapitools/codegen/OpenAPINormalizerTest.java

@@ -955,6 +955,10 @@ public void testOpenAPINormalizerProcessingArraySchema31Spec() {
         assertNotEquals(((Schema) schema11.getOneOf().get(0)).getPrefixItems(), null);
         assertEquals(((Schema) schema11.getOneOf().get(1)).getItems(), null);
 
+        Schema schema13 = openAPI.getComponents().getSchemas().get("OneOfArrayWithTitle");
+        assertEquals(((Schema) schema13.getOneOf().get(0)).getTitle(), "dog_array");
+        assertEquals(((Schema) schema13.getOneOf().get(1)).getTitle(), "cat_object");
+
         Map<String, String> inputRules = Map.of("NORMALIZE_31SPEC", "true");
         OpenAPINormalizer openAPINormalizer = new OpenAPINormalizer(openAPI, inputRules);
         openAPINormalizer.normalize();
@@ -992,6 +996,12 @@ public void testOpenAPINormalizerProcessingArraySchema31Spec() {
         assertNotEquals(((Schema) schema12.getOneOf().get(0)).getItems(), null);
         assertEquals(((Schema) schema12.getOneOf().get(0)).getPrefixItems(), null);
         assertNotEquals(((Schema) schema12.getOneOf().get(1)).getItems(), null);
+
+        Schema schema14 = openAPI.getComponents().getSchemas().get("OneOfArrayWithTitle");
+        assertEquals(((Schema) schema14.getOneOf().get(0)).getTitle(), "dog_array");
+        assertEquals(((Schema) schema14.getOneOf().get(1)).getTitle(), "cat_object");
+        assertTrue(ModelUtils.isArraySchema((Schema) schema14.getOneOf().get(0)));
+        assertEquals(((Schema) schema14.getOneOf().get(0)).getType(), "array");
     }
 
     @Test

modules/openapi-generator/src/test/resources/3_1/issue_18291.yaml

@@ -66,4 +66,15 @@ components:
             - type: integer
           maxItems: 3
           minItems: 3
-        - type: array
+        - type: array
+    OneOfArrayWithTitle:
+      oneOf:
+        - title: dog_array
+          type: array
+          items:
+            type: string
+        - title: cat_object
+          type: object
+          properties:
+            name:
+              type: string