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我有 2 张桌子（工作场所和工人）有一个：m 关系。我的目标是拥有一个workplace结构，Vec其中包含所有相关的workers. 我想使用 sqlx 来做到这一点。使用 Diesel 对我来说不是一个选择。

这是我在数据库方面想出的：

CREATE TABLE workplaces (
    id BIGSERIAL PRIMARY KEY,
    place TEXT NOT NULL
);

CREATE TABLE workers (
    id BIGSERIAL PRIMARY KEY,
    name TEXT NOT NULL
);

CREATE TABLE workplaces_workers (
    workplace_id BIGINT NOT NULL REFERENCES workplaces (id) ON DELETE CASCADE,
    workers_id BIGINT NOT NULL REFERENCES workers (id) ON DELETE CASCADE,
    PRIMARY KEY (workplace_id, workers_id)
);

到目前为止，这是我的 rust 代码：

pub struct Workplace {
    pub id: i64,
    pub place: String,
    pub workers: Option<Vec<Worker>>
}

pub struct Worker {
    pub id: i64,
    pub name: String
}

我尝试使用sqlx::query_as宏，但我想不出一种方法来映射Vec<Worker>

pub async fn find_workplace(pool: &PgPool, id: &i64) -> Result<Option<Workplace>> {
  return Ok(query_as!(Workplace, "SELECT * FROM workplaces wp 
      JOIN workplaces_workers wpws ON wp.id = wpws.workplace_id
      JOIN workers ws ON wpws.workers_id = ws.id 
      WHERE wp.id = $1", id).fetch_optional(pool).await?)
}
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