How to make a type of hash map with struct in rust

Question

I am new to rust and I am looking to implement my hashmap in my struct like so

#[derive(Clone, Data)]
struct CheckState { 
    cool: String,
    int_cool: i32,
    hashmap_cool: HashMap<i32, String>
}

But i keep recieving the error code error[E0277]: the trait bound `HashMap<i32, std::string::String>: Data` is not satisfied and i do not understand why and the help is not much help

the rust help

 help: the following other types implement trait `Data`:
            &'static str
            ()
            (T0, T1)
            (T0, T1, T2)
            (T0, T1, T2, T3)
            (T0, T1, T2, T3, T4)
            (T0, T1, T2, T3, T4, T5)
            (T0,)
          and 87 others
  = note: this error originates in the derive macro `Data` (in Nightly builds, run with -Z macro-backtrace for more info)

please ignore variable names they are not the same in my code

#[derive(Data)] is not in the Rust's standard library. Which library are you using? — Dogbert
– Dogbert, Commented Apr 30, 2022 at 3:10
I am using the library druid but the question has been answered by jonathan ! ty — Grandma Kisses
– Grandma Kisses, Commented Apr 30, 2022 at 3:18

Chayim Friedman · Accepted Answer · 2022-05-01 11:50:30Z

3

For a simple fix add:

struct CheckState { 
    cool: String,
    int_cool: i32,
    #[data(ignore)]
    hashmap_cool: HashMap<i32, String>
}

See the druid documentation for a better understanding:

#[data(ignore)] makes the generated Data::same function skip comparing this field.

edited May 1, 2022 at 11:50

Chayim Friedman

76.2k5 gold badges96 silver badges140 bronze badges

answered Apr 30, 2022 at 3:14

Jonathan Coletti

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