My Rust lib does some operations on JSON, and in unit tests I need to ensure the correctness of the lib. Yet, json to string conversion keeps key order unstable. I do NOT want to modify the lib to include json sorting, but I do need to compare the results effectively in my unit tests.… Read More In Rust tests, how to assert_eq some json that keeps reordering its keys

I’m new to Rust and have a project that requires specifying a config that is a tree. In JSON this would be like: { "a": { "d": { "val": 10 }, "e": { val: 20 } }, "b": { "val": 5 }, "c": { "val": 1 } } Here the root has 3 children "a,b,c"… Read More Encoding a tree with serde_json

When implementing Deserialize, how to return an error? impl<‘de> Deserialize<‘de> for Response { fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: Deserializer<‘de> { … // Which error to return here? } } Here every error must be convertible to D::Error, but D::Error maybe any whatsoever type. So, I cannot create a type convertible to D::Error.… Read More How to return an error from `deserialize`?

I can’t find how to deserialize a JSON string into an integer type using serde. My attempt won’t compile: #[derive(Debug, Deserialize)] struct WebsocketMessage { #[serde(deserialize_with = "str::parse")] timestamp: u64 } >Solution : Well, str::parse simply doesn’t have the right type. The type must be fn<‘de, D>(D) -> Result<T, D::Error> where D: Deserializer<‘de> as documented here.… Read More Serde deserialize String into u64

I have the following two structs for which I derive serde traits. use serde::{Serialize, Deserialize}; #[derive(Serialize, Deserialize)] pub struct Item<‘a> { pub id: &’a str, pub name: &’a str } #[derive(Serialize, Deserialize)] struct Set<‘a> { items: Vec<Item<‘a>> } When I try to compile this, I am getting am getting the following error message to ensure… Read More Rust Deserialization Lifetimes Problem : 'de must outlive 'a

I’m trying to parse xml response containing boolean representation as strings into bool type in a custom structure. A similar question was mentioned here for json files. And I get a runtime error that I suspect is just like the one mentioned here, but I don’t know how I can fix it. MRE: [package] name… Read More How to deserialize a string representation of boolean in XML

I am trying to parse the response to a graphql endpoint using this code: extern crate serde_derive; use gql_client::Client; use serde::{Deserialize, Serialize}; #[derive(Debug, Serialize, Deserialize)] pub struct DevActivity { pub data: Data, } #[derive(Debug, Serialize, Deserialize)] pub struct Data { #[serde(rename = "getMetric")] pub get_metric: GetMetric, } #[derive(Debug, Serialize, Deserialize)] pub struct GetMetric { #[serde(rename… Read More Unable to parse graphql endpoint