Is there any way to remove None fields in a struct serialized with serde?

Question

I am trying to get User info from MongoDB like this:

pub async fn find_user_by_name(&self, data: String) -> Vec<Uye> {
    let filter = doc! {"isim": data};
    let options = FindOptions::builder()
        .projection(doc! {"sifre": 0, "mail": 0, "tokenInfo": 0 })
        .build();
    let cursor = match self.user_col.find(None, options).await {
        std::result::Result::Ok(cursor) => cursor,
        std::result::Result::Err(_) => return vec![],
    };

    cursor.try_collect().await.unwrap()
}

My Uye struct is:

pub struct Uye {
    pub id: Option<i32>,
    pub isim: Option<String>,
    pub sifre: Option<String>,
    pub mail: Option<String>,
    pub dogumtarihi: Option<String>,
    pub avatar_url: Option<String>,
    pub kaydedilen: Option<Vec<i32>>,
    pub perm: Option<String>,
    pub permLevel: Option<i32>,
    pub onaylandi: Option<bool>,
    pub isDummy: Option<bool>,
    pub hesap_onay_kodu: Option<i32>,
    pub avatar_path: Option<String>,
    pub tokenInfo: Option<TokenInfo>,
}

When I get the data from the API with http request, the result is like this:

{
  "status": "basarili",
  "user": [
    {
      "id": 60,
      "isim": "test User",
      "sifre": null, // <-----
      "mail": null, // <-----
      "dogumtarihi": "",
      "avatar_url": "/static/uploads/images/avatar",
      "kaydedilen": [],
      "perm": "Üye",
      "permLevel": 0,
      "onaylandi": false,
      "isDummy": false,
      "hesap_onay_kodu": 123123,
      "avatar_path": "/static/uploads/images/avatar",
      "tokenInfo": null // <-----
    }
  ]
}

I want to delete null fields from object to make it look more better. Is there any way to it ?

Answer 1

You have quite a lot of fields in your struct. Might be worthwhile to use the serde_with crate:

#[serde_with::skip_serializing_none]
#[derive(Serialize)]
pub struct Uye {
    pub id: Option<i32>,
    pub isim: Option<String>,
    // ...
}