Enum StringOrRef

pub enum StringOrRef {
    String(String),
    Ref(Ref),
}

Represents a value that is either a string, or a reference to a value already in the expression attribute values.

use dynamodb_expression::value::{StringOrRef, Ref};

let value: StringOrRef = "a string value".into();
let value: StringOrRef = Ref::new("expression_value").into();

For example, the BeginsWith operator can take a string or a reference to an extended attribute value. Here’s how StringOrRef works with that.

use dynamodb_expression::{condition::BeginsWith, value::Ref, Path};

let begins_with = BeginsWith::new("foo".parse::<Path>()?, "T");
assert_eq!(r#"begins_with(foo, "T")"#, begins_with.to_string());

let begins_with = BeginsWith::new("foo".parse::<Path>()?, Ref::new("prefix"));
assert_eq!(r#"begins_with(foo, :prefix)"#, begins_with.to_string());

See also: Ref

Variants

String(String)

Ref(Ref)

Trait Implementations

impl From<&&str> for StringOrRef

fn from(value: &&str) -> Self

Converts to this type from the input type.

impl From<&String> for StringOrRef

fn from(value: &String) -> Self

Converts to this type from the input type.

impl From<&str> for StringOrRef

fn from(value: &str) -> Self

Converts to this type from the input type.

impl From<Ref> for StringOrRef

fn from(value: Ref) -> Self

Converts to this type from the input type.

impl From<String> for StringOrRef

fn from(value: String) -> Self

Converts to this type from the input type.