support adding additional annotations to the Path structs

[amircodota]

We currently have #{patch_derive] which allows adding derive macros to the generated patch structs.

It would be nice to add additional attributes (not sure I'm using the right term here :-)).

For example, it would be nice to add the serde_with crate annotations to both generated Patch structs or the struct fields.

[yanganto]

Could you give a short code snippets you want to use here? That will be easier to help you.

[amircodota]

#[derive(Patch, Debug)]
#[patch_derive(Serialize, Deserialize, Default)]
struct Data {
    value: String,
    num: usize,
}

This will generate

#[derive(Serialize, Deserialize, Default)]
struct PatchData {
  value: Option<String>,
  num: Option<usize>,
}

But I would like to have some way to specify that it should be generated with additional macro attributes

#[derive(Serialize, Deserialize, Default)]
#[skip_serializing_none]
struct PatchData {
  value: Option<String>,
  num: Option<usize>,
}

where the skip_serializing_none macro comes from the serde_with crate.

Maybe have a #[patch_attribute] that's similar to #[patch_derive]

use serde_with::skip_serializing_none;

#[derive(Patch, Debug)]
#[patch_derive(Serialize, Deserialize, Default)]
#[patch_attribute(skip_serializing_none)]
struct Data {
    value: String,
    num: usize,
}

Ideally I could apply this macro to both the struct and its fields

[yanganto]

Hi @amircodota,

Thanks for the code snippets, I tried, but there seems to be some restriction.
I am not sure it is possible to do it.
It is sorry I can not provide this quickly, please kindly understand.

[amircodota]

np 👍

Thanks for trying

[taorepoara]

I think that a good solution to add behaviors with global patch attribute that can be parsed to a struct, just like it's done in serde. This could ease the implementation of new features and the add of new attributes.