12 unstable releases (3 breaking)
0.4.1 | Oct 2, 2023 |
---|---|
0.3.2 | Aug 8, 2023 |
0.3.1 | Jul 24, 2023 |
0.2.3 | Mar 4, 2023 |
#276 in Encoding
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Struct Patch
A lib help you patch Rust instance, and easy to partial update configures.
Introduction
This crate provides the Patch
trait and an accompanying derive macro.
Deriving Patch
on a struct will generate a struct similar to the original one, but with all fields wrapped in an Option
.
An instance of such a patch struct can be applied onto the original struct, replacing values only if they are set to Some
, leaving them unchanged otherwise.
Quick Example
use struct_patch::Patch;
use serde::{Deserialize, Serialize};
#[derive(Default, Debug, PartialEq, Patch)]
#[patch_derive(Debug, Default, Deserialize, Serialize)]
struct Item {
field_bool: bool,
field_int: usize,
field_string: String,
}
fn patch_json() {
let mut item = Item {
field_bool: true,
field_int: 42,
field_string: String::from("hello"),
};
let data = r#"{
"field_int": 7
}"#;
let patch: ItemPatch = serde_json::from_str(data).unwrap();
item.apply(patch);
assert_eq!(
item,
Item {
field_bool: true,
field_int: 7,
field_string: String::from("hello")
}
);
}
Dependencies
~345–770KB
~19K SLoC