Serde is a framework for serializing and deserializing Rust data structures efficiently and generically.
Serde is a framework for serializing and deserializing Rust data structures efficiently and generically.
Questions tagged [serde]
839 questions
14
votes
1 answer
How can I accept multiple deserialization names for the same Serde field?
I am trying to use Serde to deserialize JSON (serde-json) and XML (serde-xml-rs) files based on the following struct:
use serde_derive::Deserialize;
#[derive(Debug, Clone, PartialEq, Deserialize)]
pub struct SchemaConfig {
pub name: String,
…
MarcioPorto
- 555
- 7
- 22
14
votes
4 answers
Deserialize a JSON string or array of strings into a Vec
I'm writing a crate that interfaces with a JSON web API. One endpoint usually returns responses of the form { "key": ["value1", "value2"] }, but sometimes there's only one value for the key, and the endpoint returns { "key": "value" } instead of {…
Arnavion
- 3,627
- 1
- 24
- 31
13
votes
2 answers
Deserialize file using serde_json at compile time
At the beginning of my program, I read data from a file:
let file = std::fs::File::open("data/games.json").unwrap();
let data: Games = serde_json::from_reader(file).unwrap();
I would like to know how it would be possible to do this at compile time…
Nils André
- 571
- 5
- 17
13
votes
1 answer
How to derive serde::Deserialize for a struct with members with lifetimes
How can I derive Deserialize for a struct with objects with different or equal lifetimes inside?
playground
#[derive(Default, Debug, serde::Deserialize, serde::Serialize)]
struct B<'a> {
b: &'a str,
}
#[derive(Default, Debug,…
VP.
- 15,509
- 17
- 91
- 161
13
votes
4 answers
How can I support an unknown or other value for a Serde enum?
I have a JSON API that returns an object that looks like this:
{
"PrivatePort": 2222,
"PublicPort": 3333,
"Type": "tcp"
}
To capture this, I have an enum and a struct:
#[derive(Eq, PartialEq, Deserialize, Serialize, Debug)]
#[serde(rename_all…
Travis Gockel
- 26,877
- 14
- 89
- 116
13
votes
1 answer
Serialization of large struct to disk with Serde and Bincode is slow
I have a struct that contains a vector of 2³¹ u32 values (total size about 8GB). I followed the bincode example to write it to disk:
#[macro_use]
extern crate serde_derive;
extern crate bincode;
use std::fs::File;
use…
m00am
- 5,910
- 11
- 53
- 69
13
votes
4 answers
How can we write a generic function for checking Serde serialization and deserialization?
In a project where custom Serde (1.0) serialization and deserialization methods are involved, I have relied on this test routine to check whether serializing an object and back would yield an equivalent object.
// let o: T = ...;
let buf: Vec =…
E_net4
- 27,810
- 13
- 101
- 139
13
votes
2 answers
Is there is a simpler way to convert a type upon deserialization?
Using serde_json, I have JSON objects with Strings that I need to convert to floats. I've stumbled upon a custom deserializer solution, but it seems like a hack. Here is a working playground example of the code below.
#[macro_use]
extern crate…
user1992266
- 243
- 2
- 9
12
votes
1 answer
rust serde - flatten path on deserialize
I want to deserialize a pretty deep JSON to Rust struct:
{
"root": {
"f1": {
"f2": {
"f3": 123
}
}
}
}
When deriving Deserialize, I will have to create too many structs - one for each level for the above JSON…
Rahul
- 1,727
- 3
- 18
- 33
12
votes
1 answer
How to pass options to Rust's serde that can be accessed in Deserialize::deserialize()?
For context: I'm writing a ray tracer in Rust but I'm struggling with finding a good way to load the scene in a filesystem-agnostic way. I'm using serde so that I don't have to invent my own file format (yet). The assets (image textures and mesh…
Max Klein
- 468
- 1
- 6
- 22
12
votes
3 answers
How to get at one particular item in JSON file using serde_json without deriving structs?
I have a complex JSON file and I'd like to extract only a single value out of it. I could define all of the structs and derive Deserialize on all of them, but I'd like to just write a little manual code to pull that one value out. The Serde…
Listerone
- 1,381
- 1
- 11
- 25
12
votes
1 answer
Why does serde_json::from_reader take ownership of the reader?
My code:
fn request_add(request: &mut Request, collection_name: &'static str) -> Fallible>
where
T: serde::Serialize + serde::de::DeserializeOwned,
{
let add_dao = dao::MongoDao::new(collection_name);
let obj =…
Дмитрий Шулицкий
- 566
- 1
- 4
- 17
11
votes
1 answer
Why Am I Getting "Cannot Derive Macro In This Scope"?
Attempting cargo build against this code:
#![allow(unused)]
use serde::{Deserialize, Serialize};
use serde_json::{Result, Value};
#[derive(Serialize, Deserialize,Debug)]
struct Repository{
r#type: String,
url: String,
}
fn main() {
…
Onorio Catenacci
- 14,928
- 14
- 81
- 132
11
votes
2 answers
How can I ignore extra tuple items when deserializing with Serde? ("trailing characters" error)
Serde ignores unknown named fields when deserializing into regular structs. How can I similarly ignore extra items when deserializing into tuple structs (e.g. from a heterogeneous JSON array)?
For example, this code ignores the extra "c" field just…
Jo Liss
- 30,333
- 19
- 121
- 170
11
votes
1 answer
Is there a way to omit wrapper/root objects when deserializing objects with Serde?
I have the following object:
{
"data": {
"id": 1,
"name": "South America",
"countries": {
"data": [
{
"id": 122,
"name": "Brazil",
"capital": "Brasilia"
}
]
}
}
}
I'd…
tehAnswer
- 960
- 1
- 13
- 28