Rust - 类型的值不能从 `std::iter::Iterator<>` 构建

Question

I have struct from which I want to extract the data.

#[derive(Debug, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct RunResult {
    pub runs: Vec<RunDetails>,
}

#[derive(Debug, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct RunDetails {
    pub details: String,
    pub name: String,
    pub id: String,
    pub type: String,
}

I am getting the data which got inserted in above struct in the variable result which I am iterating below

let my_result:RunResult = result
        .runs
        .into_iter()
        .filter(|line| line.details.contains(&"foo"))
        .collect();

I am getting the error as

value of type `RunResult` cannot be built from `std::iter::Iterator<Item=RunDetails>`

I want to get the record where type=OK , details contains foo with highest id .

How can I achieve this?

Answer 1

Check out the documentation for collect here .

Your struct RunResult should implement FromIterator<RunDetails> .

Try adding this:

impl FromIterator<RunDetails> for RunResult {
    fn from_iter<I: IntoIterator<Item=RunDetails>>(iter: I) -> Self {
        let v = Vec::new();

        for r in iter {
            v.push(r);
        }

        Self {
            runs: v
        }
    }
}