Trait FromQueryResult

pub trait FromQueryResult: Sized {
    // Required method
    fn from_query_result(res: &QueryResult, pre: &str) -> Result<Self, DbErr>;

    // Provided methods
    fn from_query_result_optional(
        res: &QueryResult,
        pre: &str,
    ) -> Result<Option<Self>, DbErr> { ... }
    fn find_by_statement(stmt: Statement) -> SelectorRaw<SelectModel<Self>> { ... }
}

A Trait for implementing a QueryResult

Required Methods

fn from_query_result(res: &QueryResult, pre: &str) -> Result<Self, DbErr>

Instantiate a Model from a QueryResult

Provided Methods

fn from_query_result_optional( res: &QueryResult, pre: &str, ) -> Result<Option<Self>, DbErr>

Transform the error from instantiating a Model from a QueryResult and converting it to an Option

fn find_by_statement(stmt: Statement) -> SelectorRaw<SelectModel<Self>>

use sea_orm::{query::*, FromQueryResult};

#[derive(Debug, PartialEq, FromQueryResult)]
struct SelectResult {
    name: String,
    num_of_cakes: i32,
}

let res: Vec<SelectResult> = SelectResult::find_by_statement(Statement::from_sql_and_values(
    DbBackend::Postgres,
    r#"SELECT "name", COUNT(*) AS "num_of_cakes" FROM "cake" GROUP BY("name")"#,
    [],
))
.all(&db)
.await?;

assert_eq!(
    res,
    [SelectResult {
        name: "Chocolate Forest".to_owned(),
        num_of_cakes: 2,
    },]
);

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl FromQueryResult for JsonValue