MongoDB request DSL • opensavvy.ktmongo.dsl.aggregation.operators • StringValueOperators • lowercase

lowercase

open fun <Context : Any> Value<Context, String?>.lowercase(): Value<Context, String?>

Converts a string to lowercase, returning the result.

If the argument resolves to null, $toLower returns an empty string "".

Example

class Document(
    val text: String,
)

collection.aggregate()
    .set {
        Document::text set of(Document::text).lowercase()
    }.toList()

External resources

• Official documentation