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

concat¶

open fun <Context : Any> concat(strings: List<Value<Context, String?>>): Value<Context, String?>

Concatenates strings together.

If any of strings are null, the concatenation returns null.

Example¶

class Document(
    val firstName: String,
    val lastName: String,
    val fullName: String,
)

collection.aggregate()
    .set {
        Document::fullName set concat(of(Document::firstName), of(" "), of(Document::lastName))
    }
    .toList()

External resources¶

Official documentation

open fun <Context : Any> concat(vararg strings: Value<Context, String?>): Value<Context, String?>

Concatenates strings together.

If any of strings are null, the concatenation returns null.

Example¶

class Document(
    val firstName: String,
    val lastName: String,
    val fullName: String,
)

collection.aggregate()
    .set {
        Document::fullName set concat(of(Document::firstName), of(" "), of(Document::lastName))
    }
    .toList()

External resources¶

Official documentation

open infix fun <Context : Any> Value<Context, String?>.concat(other: Value<Context, String?>): Value<Context, String?>

Concatenates strings together.

If any of strings are null, the concatenation returns null.

Example¶

class Document(
    val firstName: String,
    val lastName: String,
    val fullName: String,
)

collection.aggregate()
    .set {
        Document::fullName set (of(Document::firstName) concat of(" ") concat of(Document::lastName))
    }
    .toList()

External resources¶

Official documentation