69 lines
1.7 KiB
Rust
69 lines
1.7 KiB
Rust
use std::borrow::Cow;
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use crate::parser::types::Field;
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use crate::{
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registry, ContextSelectionSet, InputType, InputValueError, InputValueResult, OutputType,
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Positioned, ServerResult, Type, Value,
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};
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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: InputType> InputType for Option<T> {
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fn parse(value: Option<Value>) -> InputValueResult<Self> {
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match value.unwrap_or_default() {
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Value::Null => Ok(None),
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value => Ok(Some(
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T::parse(Some(value)).map_err(InputValueError::propagate)?,
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)),
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}
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}
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fn to_value(&self) -> Value {
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match self {
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Some(value) => value.to_value(),
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None => Value::Null,
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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: OutputType + Sync> OutputType for Option<T> {
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async fn resolve(
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&self,
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ctx: &ContextSelectionSet<'_>,
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field: &Positioned<Field>,
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) -> ServerResult<Value> {
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if let Some(inner) = self {
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OutputType::resolve(inner, ctx, field).await
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} else {
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Ok(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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