KtMongo: MongoDB driver for Kotlin • Coroutines/opensavvy.ktmongo.coroutines.operations/CountOperations/exists

exists

open suspend fun exists(options: CountOptions<Document>.() -> Unit = {}, predicate: FilterQuery<Document>.() -> Unit): Boolean(source)

Tests if there exists a document that matches predicate in the collection.

This method is a convenience function for calling count with a limit of 1.

Example

class User(
    val name: String,
    val age: Int,
)

collection.exists {
    User::name eq "foo"
    User::age eq 10
}