Struct NumberAttribute 

pub struct NumberAttribute;

Marker type for DynamoDB Number (N) attributes.

Use this as the Type in an attribute_definitions! block to declare that an attribute stores a numeric value. Rust types that implement IntoTypedAttributeValue<NumberAttribute> include all integer and floating-point primitives, as well as AsNumber<T> (for pre-formatted number strings).

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

Examples

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

attribute_definitions! {
    Score { "score": NumberAttribute }
}

struct MyItem;
// ✓ u32 implements IntoTypedAttributeValue<NumberAttribute>
has_attributes! {
    MyItem {
        Score { fn attribute_value(id) -> u32 { 100 } }
    }
}

struct OtherItem;
// ✓ i64 also works
has_attributes! {
    OtherItem {
        Score { fn attribute_value(id) -> i64 { -5 } }
    }
}

// These would NOT compile — wrong attribute type:
// has_attributes! { MyItem { Score { const VALUE: &'static str = "hi"; } } }
// has_attributes! { MyItem { Score { fn attribute_value(id) -> Vec<u8> { vec![] } } } }

Trait Implementations

impl Clone for NumberAttribute

fn clone(&self) -> NumberAttribute

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NumberAttribute

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

Formats the value using the given formatter.

impl AttributeType for NumberAttribute

impl Copy for NumberAttribute