MongoDB request DSL • opensavvy.ktmongo.dsl.query • FilterQueryPredicate • exists

exists

abstract fun exists()

Matches documents that contain the specified field, including values where the field value is null.

Example

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

collection.find {
    User::name {
        exists()
    }
}

External resources

• Official documentation

See also

• FilterQuery.exists Shorthand.

• FilterQueryPredicate.doesNotExist Opposite.

• FilterQueryPredicate.isNotNull Identical, but does not match elements where the field is null.