Add support for sorting simple arrays (integers/strings) with SortArray ()

- Added methods `byValueAscending()` and `byValueDescending()` to the SortArray class
  to support sorting simple array types (e.g., integers, strings) in ascending and descending order.
- Updated tests to verify the correct functionality of sorting arrays by value.
- Refactored SortArray to handle sorting of simple types without requiring a property for sorting.

For more details, refer to: https://www.mongodb.com/docs/manual/reference/operator/aggregation/sortArray/

Resolves: #4929
Original Pull Request: #4943

Signed-off-by: Ranzy Blessings <[email protected]>

Author: Ranzy Blessings

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

@@ -2059,6 +2059,28 @@ public SortArray by(Sort sort) {
 			return new SortArray(append("sortBy", sort));
 		}
 
+		/**
+		 * 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));
+		}
+
 		/*
 		 * (non-Javadoc)
 		 * @see org.springframework.data.mongodb.core.aggregation.AbstractAggregationExpression#getMongoMethod()

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

@@ -25,6 +25,7 @@
 import org.junit.jupiter.api.Test;
 import org.springframework.data.domain.Sort;
 import org.springframework.data.mongodb.core.aggregation.ArrayOperators.ArrayToObject;
+import org.springframework.data.mongodb.core.aggregation.ArrayOperators.SortArray;
 
 /**
  * Unit tests for {@link ArrayOperators}
@@ -179,4 +180,27 @@ 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 = 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 = 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 = 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);
+	}
 }