I have rust actix-web rest project, which uses tokio_postgres and serde_postgres.
The Table
acme=# \d job
Table "public.job"
Column | Type | Collation | Nullable | Default
-----------------+-----------------------------+-----------+----------+-------------------------------------
created_at | timestamp without time zone | | not null | CURRENT_TIMESTAMP
The Struct
#[derive(Debug, Deserialize, Serialize)]
pub struct Job {
pub created_at: NaiveDateTime,
}
The Function
pub async fn get_all_jobs(&self) -> Result<Vec<Job>, Error> {
let client = self.pool.get_conn().await?;
let query = "SELECT created_at FROM job";
let rows = &client.query(query, &[]).await?;
// ------------ Following line throws error --------------
let jobs: Vec<Job> = from_rows(rows)?;
// ------------ Following lines works fine ---------------
// let mut jobs: Vec<Job> = Vec::new();
// for row in rows {
// jobs.push(Job {
// created_at: row.get(0)
// })
// }
Ok(jobs)
}
Cargo.toml
tokio = { version = "0.3", features = ["full"] }
serde = "1.0.117"
serde_derive = "1.0.117"
serde_json = "1.0.60"
serde_postgres = "0.2.0"
thiserror = "1.0.22"
tokio-postgres = { version = "0.5", features = ["with-uuid-0_8", "with-chrono-0_4"] }
The above code executes perfectly when I traverse the rows
and map each row to Job
struct manually. I don't like this manual approach where serde_postgres::from_rows
is designed for just the same task, but it fails for timestamp without time zone
type columns only.
I am suspecting this is version mismatch issue, if not I am missing something. Would be a great help if anyone can share some ideas/solutions
It seems serde_postgres crate does not support datetimes. refer this
So I implemented from_rows likes this
impl From<&Row> for Job {
fn from(row: &Row) -> Self {
Self {
created_at: row.get("created_at")
}
}
}
This works.