From caaa90f04ab7ce5933f3ab947d73097cff135ff7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ivan=20=E2=80=9CCLOVIS=E2=80=9D=20Canet?=
 <ivan.canet@gmail.com>
Date: Sun, 22 Mar 2026 22:35:21 +0100
Subject: [PATCH 1/2] feat(driver-coroutines): Add MongoCollection.exists()

---
 .../kotlin/operations/CountOperations.kt      | 30 +++++++++++++++++++
 .../commonTest/kotlin/BasicReadWriteTest.kt   |  2 ++
 2 files changed, 32 insertions(+)

diff --git a/driver-coroutines/src/commonMain/kotlin/operations/CountOperations.kt b/driver-coroutines/src/commonMain/kotlin/operations/CountOperations.kt
index d2af4dad..96acd4f1 100644
--- a/driver-coroutines/src/commonMain/kotlin/operations/CountOperations.kt
+++ b/driver-coroutines/src/commonMain/kotlin/operations/CountOperations.kt
@@ -61,6 +61,36 @@ interface CountOperations<Document : Any> : BaseOperations {
 		predicate: FilterQuery<Document>.() -> Unit,
 	): Long
 
+	/**
+	 * Tests if there exists a document that matches [predicate] in the collection.
+	 *
+	 * This method is a convenience function for calling [count] with a [limit][CountOptions.limit] of 1.
+	 *
+	 * ### Example
+	 *
+	 * ```kotlin
+	 * class User(
+	 *     val name: String,
+	 *     val age: Int,
+	 * )
+	 *
+	 * collection.exists {
+	 *     User::name eq "foo"
+	 *     User::age eq 10
+	 * }
+	 * ```
+	 */
+	suspend fun exists(
+		options: CountOptions<Document>.() -> Unit = {},
+		predicate: FilterQuery<Document>.() -> Unit,
+	): Boolean = count(
+		options = {
+			options()
+			limit(1)
+		},
+		predicate = predicate,
+	) == 1L
+
 	/**
 	 * Counts all documents in the collection.
 	 *
diff --git a/test/src/commonTest/kotlin/BasicReadWriteTest.kt b/test/src/commonTest/kotlin/BasicReadWriteTest.kt
index cc2abc46..54ceaadb 100644
--- a/test/src/commonTest/kotlin/BasicReadWriteTest.kt
+++ b/test/src/commonTest/kotlin/BasicReadWriteTest.kt
@@ -43,6 +43,8 @@ val BasicReadWriteTest by preparedSuite(preparedConfig = CoroutineTimeout(30.sec
 		users().insertOne(User(_id = id1, name = "Bob", age = 18))
 
 		check(User(_id = id1, "Bob", age = 18) in users().find().toList())
+
+		check(users().exists { User::_id eq id1 })
 	}
 
 	test("Simple upsert and read") {
-- 
2.51.2


From 9f32867e9482c36065ebdaa5fd1c76110b00bf2a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ivan=20=E2=80=9CCLOVIS=E2=80=9D=20Canet?=
 <ivan.canet@gmail.com>
Date: Sun, 22 Mar 2026 22:35:59 +0100
Subject: [PATCH 2/2] feat(driver-sync): Add MongoCollection.exists()

---
 .../kotlin/operations/CountOperations.kt      | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/driver-sync/src/commonMain/kotlin/operations/CountOperations.kt b/driver-sync/src/commonMain/kotlin/operations/CountOperations.kt
index 708d06af..5e663f96 100644
--- a/driver-sync/src/commonMain/kotlin/operations/CountOperations.kt
+++ b/driver-sync/src/commonMain/kotlin/operations/CountOperations.kt
@@ -61,6 +61,36 @@ interface CountOperations<Document : Any> : BaseOperations {
 		predicate: FilterQuery<Document>.() -> Unit,
 	): Long
 
+	/**
+	 * Tests if there exists a document that matches [predicate] in the collection.
+	 *
+	 * This method is a convenience function for calling [count] with a [limit][CountOptions.limit] of 1.
+	 *
+	 * ### Example
+	 *
+	 * ```kotlin
+	 * class User(
+	 *     val name: String,
+	 *     val age: Int,
+	 * )
+	 *
+	 * collection.exists {
+	 *     User::name eq "foo"
+	 *     User::age eq 10
+	 * }
+	 * ```
+	 */
+	fun exists(
+		options: CountOptions<Document>.() -> Unit = {},
+		predicate: FilterQuery<Document>.() -> Unit,
+	): Boolean = count(
+		options = {
+			options()
+			limit(1)
+		},
+		predicate = predicate,
+	) == 1L
+
 	/**
 	 * Counts all documents in the collection.
 	 *
-- 
2.51.2