57 lines
1.4 KiB
Rust
57 lines
1.4 KiB
Rust
use crate::{
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registry, ContextSelectionSet, InputValueType, OutputValueType, Pos, Result, Type, Value,
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};
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use std::borrow::Cow;
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impl<T: Type> Type for Option<T> {
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fn type_name() -> Cow<'static, str> {
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T::type_name()
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}
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fn qualified_type_name() -> String {
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T::type_name().to_string()
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}
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fn create_type_info(registry: &mut registry::Registry) -> String {
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T::create_type_info(registry);
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T::type_name().to_string()
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}
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}
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impl<T: InputValueType> InputValueType for Option<T> {
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fn parse(value: &Value) -> Option<Self> {
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match value {
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Value::Null => Some(None),
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_ => Some(Some(T::parse(value)?)),
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}
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}
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}
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#[async_trait::async_trait]
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impl<T: OutputValueType + Sync> OutputValueType for Option<T> {
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async fn resolve(
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value: &Self,
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ctx: &ContextSelectionSet<'_>,
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pos: Pos,
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) -> Result<serde_json::Value> where {
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if let Some(inner) = value {
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OutputValueType::resolve(inner, ctx, pos).await
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} else {
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Ok(serde_json::Value::Null)
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use crate::Type;
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#[test]
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fn test_optional_type() {
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assert_eq!(Option::<i32>::type_name(), "Int");
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assert_eq!(Option::<i32>::qualified_type_name(), "Int");
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assert_eq!(&Option::<i32>::type_name(), "Int");
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assert_eq!(&Option::<i32>::qualified_type_name(), "Int");
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}
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}
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