Crate struct_patch

struct_patch includes struct_patch_derive and struct_patch_traits Please see these crates for docs

A derive macro struct_patch::Patch helps you generate patch structure {Struct}Patch with all fields in optional, such that patch structure is good for partial update by apply method of struct_patch::traits::Patch traits. Following is an small example with json format

use struct_patch::Patch;
use serde::{Deserialize, Serialize};

#[derive(Default, Patch)]
#[patch_derive(Debug, Default, Deserialize, Serialize)]
struct Item {
   field_bool: bool,
   field_int: usize,
   field_string: String,
}
fn patch_json() {
   use struct_patch::traits::Patch;

   let mut item = Item::default();

   let data = r#"{
       "field_int": 7
   }"#;

   let patch = serde_json::from_str(data).unwrap();
   assert_eq!(
       format!("{patch:?}"),
       "ItemPatch { field_bool: None, field_int: Some(7), field_string: None }"
   );

   item.apply(patch);

   assert_eq!(item.field_bool, false);
   assert_eq!(item.field_int, 7);
   assert_eq!(item.field_string, "");
}

Re-exports

pub use struct_patch_derive;

Modules

traits

Define the behavior between patch struct and original sturct

Derive Macros

Patch

Patch help you patch Rust instance, and easy to partial update.