error.rs

pub trait HasAcs {
    fn valid(&self) -> bool;
    fn from_row(row: &HashMap<&str, &str>) -> Self;
    fn file() -> &'static str;
}

fn process_acs<T: HasAcs + diesel::query_builder::AsChangeset>() {
    use schema::locations::dsl::*;
    let conn = establish_connection();

    let mut reader = Reader::from_file(T::file())
        .unwrap()
        .has_headers(true);
    let headers = reader.headers().unwrap();

    for row in reader.records() {
        // ... extra processing elided like populating map, zip and loc_id variables or whatever
        let it = T::from_row(&map);
        if it.valid() {
            let _ = diesel::update(locations.find(loc_id))
                .set(&it) // <- here
                .returning(id)
                .get_result::<i32>(&conn)
                .expect(&format!("Couldn't update zip {}", &zip));
        } else {
            println!("Error on {:?}", &zip);
        }
    }
}


   Compiling import v0.1.0 (file:///Users/jeff/dev/car-insurance/database/import)
error[E0277]: the trait bound `&T: diesel::query_builder::AsChangeset` is not satisfied
   --> src/lib.rs:380:18
    |
380 |                 .set(&it)
    |                  ^^^ trait `&T: diesel::query_builder::AsChangeset` not satisfied
    |
    = help: consider adding a `where &T: diesel::query_builder::AsChangeset` bound

error[E0277]: the trait bound `models::Demographics: diesel::query_builder::AsChangeset` is not satisfied
   --> src/lib.rs:391:5
    |
391 |     process_acs::<Demographics>();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ trait `models::Demographics: diesel::query_builder::AsChangeset` not satisfied
    |
    = help: the following implementations were found:
    = help:   <&'update models::Demographics as diesel::query_builder::AsChangeset>
    = note: required by `process_acs`