async-graphql 0.10.2

The GraphQL server library implemented by rust
Documentation 
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use crate::{registry, ContextSelectionSet, GQLInputValue, GQLOutputValue, GQLType, Result, Value};
use std::borrow::Cow;

impl<T: GQLType> GQLType for Option<T> {
    fn type_name() -> Cow<'static, str> {
        T::type_name()
    }

    fn qualified_type_name() -> String {
        T::type_name().to_string()
    }

    fn create_type_info(registry: &mut registry::Registry) -> String {
        T::create_type_info(registry);
        T::type_name().to_string()
    }
}

impl<T: GQLInputValue> GQLInputValue for Option<T> {
    fn parse(value: &Value) -> Option<Self> {
        match value {
            Value::Null => Some(None),
            _ => Some(Some(T::parse(value)?)),
        }
    }
}

#[async_trait::async_trait]
impl<T: GQLOutputValue + Sync> GQLOutputValue for Option<T> {
    async fn resolve(value: &Self, ctx: &ContextSelectionSet<'_>) -> Result<serde_json::Value> where
    {
        if let Some(inner) = value {
            GQLOutputValue::resolve(inner, ctx).await
        } else {
            Ok(serde_json::Value::Null)
        }
    }
}

impl<T: GQLType> GQLType for &Option<T> {
    fn type_name() -> Cow<'static, str> {
        T::type_name()
    }

    fn qualified_type_name() -> String {
        T::type_name().to_string()
    }

    fn create_type_info(registry: &mut registry::Registry) -> String {
        T::create_type_info(registry);
        T::type_name().to_string()
    }
}

#[async_trait::async_trait]
impl<T: GQLOutputValue + Sync> GQLOutputValue for &Option<T> {
    async fn resolve(value: &Self, ctx: &ContextSelectionSet<'_>) -> Result<serde_json::Value> where
    {
        if let Some(inner) = value {
            GQLOutputValue::resolve(inner, ctx).await
        } else {
            Ok(serde_json::Value::Null)
        }
    }
}

#[cfg(test)]
mod tests {
    use crate::GQLType;

    #[test]
    fn test_optional_type() {
        assert_eq!(Option::<i32>::type_name(), "Int");
        assert_eq!(Option::<i32>::qualified_type_name(), "Int");
        assert_eq!(&Option::<i32>::type_name(), "Int");
        assert_eq!(&Option::<i32>::qualified_type_name(), "Int");
    }
}