dynamodb-facade 0.1.1

A typed facade over aws-sdk-dynamodb with expression builders and batch/transaction support
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

use crate::AttributeValue;

use super::attributes::*;

/// Extracts a typed reference from an [`AttributeValue`] for a given attribute type.
///
/// Implemented for [`StringAttribute`], [`NumberAttribute`], and [`BinaryAttribute`].
pub trait AttributeValueRef: sealed_traits::AttributeTypeSeal {
    type Ref<'a>;

    fn attribute_value_ref(av: &AttributeValue) -> Self::Ref<'_>;
}

impl AttributeValueRef for StringAttribute {
    type Ref<'a> = &'a str;

    fn attribute_value_ref(av: &AttributeValue) -> &str {
        av.as_s().expect("expected S attribute")
    }
}

impl AttributeValueRef for NumberAttribute {
    type Ref<'a> = &'a str;

    fn attribute_value_ref(av: &AttributeValue) -> &str {
        av.as_n().expect("expected N attribute")
    }
}

impl AttributeValueRef for BinaryAttribute {
    type Ref<'a> = &'a [u8];

    fn attribute_value_ref(av: &AttributeValue) -> &[u8] {
        av.as_b().expect("expected B attribute").as_ref()
    }
}