Serde's Serialize implementation not found for Rocket's UUID
I'm trying to create a custom struct using the UUID struct from Rocket as a field type. I want it to be serialized using Serde in order to convert it to JSON easily.
When trying to do this, I get an error:
error[E0277]: the trait bound `rocket_contrib::UUID:
model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::Serialize` is not
satisfied
--> src/service/document.rs:4:10
|
4 | #[derive(Serialize, Deserialize)]
| ^^^^^^^^^ the trait
`model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::Serialize` is not
implemented for `rocket_contrib::UUID`
|
= note: required by `model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::ser::SerializeStruct::serialize_field`
error[E0277]: the trait bound `rocket_contrib::UUID:
model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::Deserialize<'_>` is not satisfied
--> src/service/document.rs:4:21
|
4 | #[derive(Serialize, Deserialize)]
| ^^^^^^^^^^^ the trait
`model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::Deserialize<'_>` is not implemented for `rocket_contrib::UUID`
|
= note: required by `model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::de::SeqAccess::next_element`
error[E0277]: the trait bound `rocket_contrib::UUID: model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::Deserialize<'_>` is not satisfied
--> src/service/document.rs:4:21
|
4 | #[derive(Serialize, Deserialize)]
| ^^^^^^^^^^^ the trait `model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::Deserialize<'_>` is not implemented for `rocket_contrib::UUID`
|
= note: required by `model::event::_IMPL_DESERIALIZE_FOR_Event::_serde::de::MapAccess::next_value`
My struct:
#[derive(Serialize, Deserialize)]
pub struct Document {
id: UUID,
user_id: UUID,
created: i64,
updated: i64,
text: String
}
My imports:
[dependencies]
rocket = "0.3.17"
rocket_codegen = "0.3.17"
serde_derive = "1.0.80"
serde = "1.0.80"
chrono = "0.4"
[dependencies.rocket_contrib]
version = "0.3.17"
default-features = false
features = ["json", "uuid", "serde"]
Endpoint where I use the struct:
#[get("/document/<id>")]
pub fn get_document(id: UUID) -> status::Accepted<Json<Document>> {
status::Accepted(Some(Json(document::get_document(id))))
}
I've checked all dependencies, and I have the serde feature enabled in rocket_contrib. I've run out of ideas what to check next.rocket_contrib::UUID does not implement Serialize: #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug)] pub struct UUID(uuid_ext::Uuid); If the type doesn't implement Serialize, you can't make it. As mcarton points out: you still can implement Serialize for your type, you simply can't derive it and will have to implement it by hand. That could look something like: #[derive(Serialize, Deserialize)] pub struct Document { #[serde(with = "my_uuid")] id: UUID, #[serde(with = "my_uuid")] user_id: UUID, created: i64, updated: i64, text: String, } mod my_uuid { use rocket_contrib::UUID; use serde::{de::Error, Deserialize, Deserializer, Serialize, Serializer}; use std::str::FromStr; pub fn serialize<S>(val: &UUID, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer, { val.to_string().serialize(serializer) } pub fn deserialize<'de, D>(deserializer: D) -> Result<UUID, D::Error> where D: Deserializer<'de>, { let val: &str = Deserialize::deserialize(deserializer)?; UUID::from_str(val).map_err(D::Error::custom) } } See also: How to transform fields during serialization using Serde? How to transform fields during deserialization using Serde? Is there a way for me to use #[derive] on a struct or enum from a library without editing the actual library's source code? How do I implement a trait I don't own for a type I don't own? Add Serialize attribute to type from third-party lib
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