2 releases
0.1.1 | Jun 18, 2022 |
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0.1.0 | May 10, 2021 |
#1647 in Encoding
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Used in 47 crates
(3 directly)
10KB
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js_option
This crate provides a type JsOption
that is very similar to the standard
library's Option
type except that it has three variants:
Some(value)
: LikeOption::Some
Null
: Explicitly not some valueUndefined
: Implicitly not some value
This type can be useful when you want to deserialize JSON to a Rust struct
and not loose information: A regular Option
deserializes to None
from
both an explicit null
or a missing field (this is due to special casing of
Option
in the Deserialize
and Serialize
derive macros, for other types
a missing field will make deserialization fail unless there is a
#[serde(skip)]
, #[serde(skip_deserializing)]
or #[serde(default)]
attribute).
Example:
# extern crate serde_crate as serde;
use serde::{Deserialize, Serialize};
#[derive(Serialize, Deserialize)]
struct MyStruct {
#[serde(default, skip_serializing_if = "JsOption::is_undefined")]
my_field: JsOption<String>,
}
License
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~175KB