Scalar

We can define custom scalars.

rusty-gql represents custom scalar by using #[derive(GqlScalar)] and GqlInputType trait.

src/graphql/scalar/base64.rs

#![allow(unused)]
#![allow(warnings, unused)]
fn main() {
use crate::graphql::*;
use rusty_gql::*;

#[derive(GqlScalar)]
pub struct Base64(String);

impl GqlInputType for Base64 {
fn from_gql_value(value: Option<GqlValue>) -> Result<Self, String> {
    if let Some(GqlValue::String(v)) = value {
        let encoded = base64::encode(v);
        Ok(Base64(encoded))
    } else {
        Err(format!(
            "{}: is invalid type for Base64",
            value.unwrap_or(GqlValue::Null).to_string()
        ))
    }
}

fn to_gql_value(&self) -> GqlValue {
    GqlValue::String(self.0.to_string())
}
}
}

schema.graphql

scalar Base64