How to get value of a column from returned rows?

[finlaydotb]

I am trying to use the results returns from performing a query with sqlx. The core of the code is below

        let rows: Vec<PgRow> = sqlx::query(query_string)
            .bind(&client_id)
            .fetch_all(&self.pool)
            .await?;

        for row in rows {
            println!("{}", row.get("id".to_string()))
        }

The documentation for .get says

    /// Index into the database row and decode a single value.
    ///
    /// A string index can be used to access a column by name and a `usize` index
    /// can be used to access a column by position.

so I assumed the above will work but compilation fails with error

73 |             println!("{}", row.get("id".to_string()))
   |                                --- ^^^^^^^^^^^^^^^^ the trait `ColumnIndex<PgRow>` is not implemented for `std::string::String`
   |                                |
   |                                required by a bound introduced by this call

Any idea why? And how do I get the value of a column from the returns rows?