Support for sorting simple arrays (integers/strings) with SortArray (Fixes #4929)

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/aggregation/ArrayOperators.java

@@ -2067,5 +2067,27 @@ public SortArray by(Sort sort) {
 		protected String getMongoMethod() {
 			return "$sortArray";
 		}
+
+		/**
+		 * Sort the array elements by their values in ascending order.
+		 * Suitable for arrays of simple types (e.g., integers, strings).
+		 *
+		 * @return new instance of {@link SortArray}.
+		 * @since 4.x (TBD)
+		 */
+		public SortArray byValueAscending() {
+			return new SortArray(append("sortBy", 1));
+		}
+
+		/**
+		 * Sort the array elements by their values in descending order.
+		 * Suitable for arrays of simple types (e.g., integers, strings).
+		 *
+		 * @return new instance of {@link SortArray}.
+		 * @since 4.x (TBD)
+		 */
+		public SortArray byValueDescending() {
+			return new SortArray(append("sortBy", -1));
+		}
 	}
 }

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/aggregation/ArrayOperatorsUnitTests.java

@@ -179,4 +179,26 @@ void sortByWithFieldRef() {
 		assertThat(ArrayOperators.arrayOf("team").sort(Sort.by("name")).toDocument(Aggregation.DEFAULT_CONTEXT))
 				.isEqualTo("{ $sortArray: { input: \"$team\", sortBy: { name: 1 } } }");
 	}
+
+	@Test // GH-4929
+	public void sortArrayByValueAscending() {
+		Document result = ArrayOperators.SortArray.sortArrayOf("numbers").byValueAscending().toDocument(Aggregation.DEFAULT_CONTEXT);
+		Document expected = new Document("$sortArray", new Document("input", "$numbers").append("sortBy", 1));
+		assertThat(result).isEqualTo(expected);
+	}
+
+	@Test // GH-4929
+	public void sortArrayByValueDescending() {
+		Document result = ArrayOperators.SortArray.sortArrayOf("numbers").byValueDescending().toDocument(Aggregation.DEFAULT_CONTEXT);
+		Document expected = new Document("$sortArray", new Document("input", "$numbers").append("sortBy", -1));
+		assertThat(result).isEqualTo(expected);
+	}
+
+	@Test // GH-4929
+	public void sortArrayByPropertyUnchanged() {
+		Document result = ArrayOperators.SortArray.sortArrayOf("items")
+				.by(Sort.by(Sort.Direction.ASC, "price")).toDocument(Aggregation.DEFAULT_CONTEXT);
+		Document expected = new Document("$sortArray", new Document("input", "$items").append("sortBy", new Document("price", 1)));
+		assertThat(result).isEqualTo(expected);
+	}
 }