Struct StringAttribute 

pub struct StringAttribute;

Marker type for DynamoDB String (S) attributes.

Use this as the Type in an attribute_definitions! block to declare that an attribute stores a string value. Rust types that implement IntoTypedAttributeValue<StringAttribute> include String, &str, &String, and Cow<'_, str>.

The type system enforces this constraint at compile time: passing a value of the wrong type (e.g. a u32 or Vec<u8>) to a StringAttribute attribute will not compile.

Examples

use dynamodb_facade::{attribute_definitions, has_attributes, StringAttribute};

attribute_definitions! {
    Label { "label": StringAttribute }
}

struct MyItem;

// ✓ &'static str implements IntoTypedAttributeValue<StringAttribute>
has_attributes! {
    MyItem {
        Label { const VALUE: &'static str = "hello"; }
    }
}

struct OtherItem;
// ✓ String also works
has_attributes! {
    OtherItem {
        Label { fn attribute_value(id) -> String { "world".to_owned() } }
    }
}

// These would NOT compile — wrong attribute type:
// has_attributes! { MyItem { Label { const VALUE: u32 = 42; } } }
// has_attributes! { MyItem { Label { fn attribute_value(id) -> Vec<u8> { vec![] } } } }

Trait Implementations

impl Clone for StringAttribute

fn clone(&self) -> StringAttribute

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for StringAttribute

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl AttributeType for StringAttribute

impl Copy for StringAttribute

impl<T: IntoStringAttributeValue + IntoAttributeValue> IntoTypedAttributeValue<StringAttribute> for T