Unable to deserialize json to struct in rust [duplicate] - rust

Question

This question already has an answer here:
How do I fix "cannot find derive macro in this scope"?
(1 answer)
Closed 2 years ago.
I am trying to Deserialize a string to a struct in rust. The below code is from json_serde documentation only.
use serde::{Deserialize, Serialize};
use serde_json::Result;
#[derive(Serialize, Deserialize)]
struct Person {
name: String,
age: u8,
phones: Vec<String>,
}
fn main() {
let data = r#"
{
"name": "John Doe",
"age": 43,
"phones": [
"[phone]",
"[phone]"
]
}"#;
// Parse the string of data into a Person object. This is exactly the
// same function as the one that produced serde_json::Value above, but
// now we are asking it for a Person as output.
let p: Person = serde_json::from_str(data).expect("bal");
// Do things just like with any other Rust data structure.
println!("Please call {} at the number {}", p.name, p.phones[0]);
}
The above code snippet gives me an error:
Compiling test-json-rs v0.1.0 (/Users/asnimpansari/Desktop/Personal/test-json-rs)
error: cannot find derive macro `Serialize` in this scope
--> src/main.rs:4:10
|
4 | #[derive(Serialize, Deserialize)]
| ^^^^^^^^^
error: cannot find derive macro `Deserialize` in this scope
--> src/main.rs:4:21
|
4 | #[derive(Serialize, Deserialize)]
| ^^^^^^^^^^^
warning: unused imports: `Deserialize`, `Serialize`
--> src/main.rs:1:13
|
1 | use serde::{Deserialize, Serialize};
| ^^^^^^^^^^^ ^^^^^^^^^
|
= note: `#[warn(unused_imports)]` on by default
warning: unused import: `serde_json::Result`
--> src/main.rs:2:5
|
2 | use serde_json::Result;
| ^^^^^^^^^^^^^^^^^^
error[E0277]: the trait bound `Person: serde::de::Deserialize<'_>` is not satisfied
--> src/main.rs:25:21
|
25 | let p: Person = serde_json::from_str(data).expect("bal");
| ^^^^^^^^^^^^^^^^^^^^ the trait `serde::de::Deserialize<'_>` is not implemented for `Person`
|
::: /Users/asnimpansari/.cargo/registry/src/github.com-1ecc6299db9ec823/serde_json-1.0.55/src/de.rs:2584:8
|
2584 | T: de::Deserialize<'a>,
| ------------------- required by this bound in `serde_json::de::from_str`
error: aborting due to 3 previous errors
For more information about this error, try `rustc --explain E0277`.
error: could not compile `test-json-rs`.
To learn more, run the command again with --verbose.
My Cargo.toml file has below dependencies
[dependencies]
serde_json = "1.0.55"
serde = "1.0.100"
Despite importing Serialize and Deserialize from the serde and adding to struct. It gives me an error.
What part am I doing wrong here?

Answer 1

You need to activate the derive macros feature in your Cargo.toml:
serde = { version = "1.0", features = ["derive"] }