[英]“key must be a string” when deserializing a JSON string with Serde
I'm building a React app utilizing Rust for complex computations.我正在构建一个使用 Rust 进行复杂计算的 React 应用程序。 In this case I'm passing a JSON formatted string from the React app to Rust:
在这种情况下,我将一个 JSON 格式的字符串从 React 应用程序传递给 Rust:
{
{'clientid': 1, 'category': 'Category #1', 'subcategory': 'Subcategory #1', 'cost': 1000.00},
{'clientid': 1, 'category': 'Category #1', 'subcategory': 'Subcategory #2', 'cost': 2000.00}
}
I'm trying to figure out how to deserialze string In Rust into an array of structs defined as:我试图弄清楚如何将 Rust 中的字符串反序列化为定义为的结构数组:
#[derive(Serialize, Deserialize, Debug)]
struct ClientBudget {
clientid: u32,
category: String,
subcategory: String,
cost: f32,
}
I tried:我试过了:
let deserialized: ClientBudget = serde_json::from_str(&some_json).unwrap();
But this causes a panic:但这会引起恐慌:
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error("key must be a string"
How do I get Rust/serde to process this JSON string?如何让 Rust/serde 处理这个 JSON 字符串?
Your JSON is badly formatted.您的 JSON 格式错误。 If you want a list, you must use
[]
not {}
.如果你想要一个列表,你必须使用
[]
而不是{}
。 You also need to deserialize a Vec
of objects:您还需要反序列化对象的
Vec
:
use serde::{Deserialize, Serialize}; // 1.0.114
#[derive(Serialize, Deserialize, Debug)]
struct ClientBudget {
clientid: u32,
category: String,
subcategory: String,
cost: f32,
}
fn main() {
let data = r#"
[
{"clientid": 1, "category": "Category #1", "subcategory": "Subcategory #1", "cost": 1000.00},
{"clientid": 1, "category": "Category #1", "subcategory": "Subcategory #2", "cost": 2000.00}
]
"#;
let deserialized: Vec<ClientBudget> = serde_json::from_str(data).unwrap();
println!("{:?}", deserialized);
}
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