async_graphql/types/external/
decimal.rs

1use std::str::FromStr;
2
3use rust_decimal::Decimal;
4
5use crate::{InputValueError, InputValueResult, Scalar, ScalarType, Value};
6
7#[Scalar(internal, name = "Decimal")]
8impl ScalarType for Decimal {
9    fn parse(value: Value) -> InputValueResult<Self> {
10        match &value {
11            Value::String(s) => Ok(Decimal::from_str(s)?),
12            Value::Number(n) => {
13                if let Some(f) = n.as_f64() {
14                    return Decimal::try_from(f).map_err(InputValueError::custom);
15                }
16
17                if let Some(f) = n.as_i64() {
18                    return Ok(Decimal::from(f));
19                }
20
21                // unwrap safe here, because we have check the other possibility
22                Ok(Decimal::from(n.as_u64().unwrap()))
23            }
24            _ => Err(InputValueError::expected_type(value)),
25        }
26    }
27
28    fn to_value(&self) -> Value {
29        Value::String(self.to_string())
30    }
31}