Struct BinaryAttribute 

pub struct BinaryAttribute;

Marker type for DynamoDB Binary (B) attributes.

Use this as the Type in an attribute_definitions! block to declare that an attribute stores binary data. Rust types that implement IntoTypedAttributeValue<BinaryAttribute> include Vec<u8> and [&[u8]].

The type system enforces this constraint at compile time: passing a value of the wrong type (e.g. a &str or u32) to a BinaryAttribute attribute will not compile.

Examples

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

attribute_definitions! {
    Thumbnail { "thumbnail": BinaryAttribute }
}

struct MyItem;

// ✓ Vec<u8> implements IntoTypedAttributeValue<BinaryAttribute>
has_attributes! {
    MyItem {
        Thumbnail {
            fn attribute_value(id) -> Vec<u8> { vec![0x89, 0x50, 0x4e, 0x47] }
        }
    }
}

// These would NOT compile — wrong attribute type:
// has_attributes! { MyItem { Thumbnail { const VALUE: &'static str = "img"; } } }
// has_attributes! { MyItem { Thumbnail { fn attribute_value(id) -> u32 { 0 } } } }

Trait Implementations

impl Clone for BinaryAttribute

fn clone(&self) -> BinaryAttribute

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BinaryAttribute

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

Formats the value using the given formatter.

impl AttributeType for BinaryAttribute

impl Copy for BinaryAttribute

impl<T: IntoBinaryAttributeValue + IntoAttributeValue> IntoTypedAttributeValue<BinaryAttribute> for T