Rust/MongoDB - bson DateTime to JSON-CodePudding

I'm trying to return a json with a datetime from MongoDB, here is my struct

#[derive(Debug, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct Management {
  // .. other properties
  #[serde(with = "bson::serde_helpers::chrono_datetime_as_bson_datetime")]
  pub created_at: DateTime<Utc>,
}

the problem is that what I'm getting is:

{
  "createdAt": {
    "$date": {
     "$numberLong": "1634685582291"
    }
   }
}

instead of {createdAt: 2021-06-24T04:00:00Z} I tried to create my own serialization method but then it was saving strings in the database instead of dates.

Can someone give me hand?

CodePudding user response：

The problem is that you are using Serde's with, which is used for both serialization and deserialization. From the [documentation][1]:

#[serde(with = "module")]
Combination of serialize_with and deserialize_with. Serde will use $module::serialize as the serialize_with function and $module::deserialize as the deserialize_with function.

Edit:

The solution would be to create another structure for the representation of the "outgoing management", where you serialize the date as an ISO string as you want:

#[derive(Debug, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct ManagementOutgoing {
  // .. other properties
  #[serde(with = "your-serializer")]
  pub created_at: DateTime<Utc>,
}

And you can implement the From trait for it so that you can easily convert a Management instance into a ManagementOutgoing.