/// Generates code for a `with_id()` method. The `sql` parameter should be a
/// Postgres query which accepts the UUID as its only argument.
///
/// ## Example
///
/// ```ignore
/// use uuid::Uuid;
///
/// struct Test {
///     id: Uuid;
/// }
///
/// with_id_query!(Test, sql = "select id from tests where id = $1");
/// ```
macro_rules! with_id_query {
    ($target:ty, sql = $sql:expr $(,)?) => {
        impl $target {
            /// Build a single-field query by ID.
            pub fn with_id(id: uuid::Uuid) -> WithIdQuery {
                WithIdQuery { id }
            }
        }

        #[derive(Clone, Copy, Debug)]
        pub struct WithIdQuery {
            id: uuid::Uuid,
        }

        impl WithIdQuery {
            pub async fn fetch_one(
                self,
                app_db: &mut crate::client::AppDbClient,
            ) -> sqlx::Result<$target> {
                query_as!($target, $sql, self.id)
                    .fetch_one(app_db.get_conn())
                    .await
            }

            pub async fn fetch_optional(
                self,
                app_db: &mut crate::client::AppDbClient,
            ) -> sqlx::Result<Option<$target>> {
                query_as!($target, $sql, self.id)
                    .fetch_optional(app_db.get_conn())
                    .await
            }
        }
    };
}
pub(crate) use with_id_query;