Function serde_dynamo::to_attribute_value

pub fn to_attribute_value<T>(value: T) -> Result<AttributeValue> where
    T: Serialize, 

Convert a T into a rusoto_dynamodb::AttributeValue which is rusoto's representation of a DynamoDb value.

In some circumstances, building rusoto_dynamodb::AttributeValues directly is required.

For example, when generating a key to supply to get_item.

use maplit::hashmap;
use serde_dynamo::to_attribute_value;

// Create the unique key of the record in DynamoDB in a way rusoto understands
let key = hashmap! {
    "id".into() => to_attribute_value(&user.id)?,
};

// And get the record
let input = GetItemInput {
    table_name: "users".to_string(),
    key: key,
    ..GetItemInput::default()
};
client.get_item(input).await?;

Or when generating attribute values in a query call.

use maplit::hashmap;
use serde_dynamo::to_attribute_value;

// Declare all of the expression inputs for a query call
let expression_attribute_values = hashmap! {
    ":user_type".to_string() => to_attribute_value(user_type)?,
    ":last_login".to_string() => to_attribute_value(yesterday)?,
};

// And execute the query
let input = QueryInput {
    table_name: "users".to_string(),
    index_name: Some("by_type_and_last_login".to_string()),
    key_condition_expression: Some("user_type = :user_type AND last_login > :last_login".to_string()),
    expression_attribute_values: Some(expression_attribute_values),
    ..QueryInput::default()
};
client.query(input).await?;