Rust trait not satisfied - rust

Question

I'm new to rust and tried searching in stackoverflow as well as reading the serde documentation
https://docs.serde.rs/serde/trait.Serialize.html and https://serde.rs/impl-serialize.html, but I was a bit lost.
I would like to use Tera to generate html and the struct I'm passing it does not have the trait serde::ser::Serialize implemented and I tried to implement it but it doesn't appear quite right.
Cargo.toml dependencies
serde = "1.0.115"
serde_derive = "1.0.115"
serde-xml-rs = "0.4.0"
tera = "0.7.2"
main.rs
extern crate tera;
#[macro_use]
extern crate serde_derive;
extern crate serde;
use tera::Context;
use serde::ser::{Serialize, SerializeStruct, Serializer};
#[derive(Serialize, Debug)]
struct Person {
firstname: String,
lastname: String,
age: i32,
}
#[derive(Debug)]
struct Attendees {
people: Vec<Person>,
updatedOn: String,
updatedBy: String,
}
impl Serialize for Attendees {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let mut s = serializer.serialize_struct("Person", 3)?;
s.serialize_field("people", &self.people)?;
s.serialize_field("updatedOn", &self.updatedOn)?;
s.serialize_field("updatedBy", &self.updatedBy)?;
s.end()
}
}
fn main() {
let mut context = Context::new();
let mut peeps: Vec<Person> = Vec::new();
let mut attendees = Attendees {
people: peeps,
updatedOn: String::from("today"),
updatedBy: String::from("someone"),
};
context.add("attendees", &attendees);
}
compiler says:
mytest % cargo run
Compiling mytest v0.1.0 (/home/mike/mytest)
error[E0277]: the trait bound `Attendees: serde::ser::Serialize` is not satisfied
--> src/main.rs:44:29
|
44 | context.add("attendees", &attendees);
| ^^^^^^^^^^ the trait `serde::ser::Serialize` is not implemented for `Attendees`
error: aborting due to previous error
I am clearly missing something... Can anyone please help?

Answer 1

The trait you implemented and the trait that the error is referring are not the same, because they refer to two different versions of serde.
[[package]]
name = "tera"
version = "0.7.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c37e2aaa53871f9c3722a20f8951fea0afd366955e11542a58feb71997c6d769"
dependencies = [
"chrono",
"error-chain",
"glob",
"humansize",
"lazy_static 0.2.11",
"pest",
"regex",
"serde 0.9.15",
"serde_json",
"slug",
"url",
]
tera 0.7.2 is not using the version 1.0.* of serde, but 0.9.*.
You may use a more recent of tera, or use a compatible serde version in your Cargo.toml:
[dependencies]
serde = "0.9.15"
serde_derive = "0.9.15"