Example handle patch request using axum

help
1

I'm looking for example to handle patch request using Axum but cannot find it.
basically I want to update partial struct data
ex:

struct UserProfile {
    first_name: Option<String>,
    last_name: Option<String>,
}

so then I can send request patch to the API by update only one field or both fields

2

You can use the axum::routing::patch function, just like you would use get or post.

3

Hi, let me clarify the problem.

#[derive(Debug, Deserialize)]
pub struct ProfileChange {
    first_name: Option<Option<String>>,
    last_name: Option<Option<String>>,
}

pub async fn edit_user(
    DatabaseConnection(conn): DatabaseConnection,
    Path(user_id): Path<String>,
    Json(payload): Json<ProfileChange>,
) -> Result<impl IntoResponse> {
    println!("Payload {:?}", payload);
    Ok("Ok")
}

so when I send Patch to the API with data
{"first_name": null}

the payload output is

ProfileChange { first_name: None, last_name: None }

I need value like below so, I know which field that need to be updated

ProfileChange { first_name: None}
4

Ah, the problem is how to distinguish between a missing field and an explicitly provided null then. Here is a possible solution:

5

Thanks , I think I have found documentation about it serde_with::rust::double_option - Rust

1 Like
6

I've also seen a specific enum for missing, present but null and present with a value.

Here it is: optional field

1 Like
7

I use this one all the time for that.

8

interesting crate. Thanks!

9

I also prefer the use of discriminated unions for describing the set of operations that can be performed to patch an entity.

11

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