async_graphql/types/external/
cow.rs

1use std::borrow::Cow;
2
3use async_graphql_parser::types::Field;
4
5use crate::{registry, ContextSelectionSet, OutputType, Positioned, ServerResult, Value};
6
7#[cfg_attr(feature = "boxed-trait", async_trait::async_trait)]
8impl<T> OutputType for Cow<'_, T>
9where
10    T: OutputType + ToOwned + ?Sized,
11    <T as ToOwned>::Owned: Send + Sync,
12{
13    fn type_name() -> Cow<'static, str> {
14        T::type_name()
15    }
16
17    fn create_type_info(registry: &mut registry::Registry) -> String {
18        <T as OutputType>::create_type_info(registry)
19    }
20
21    async fn resolve(
22        &self,
23        ctx: &ContextSelectionSet<'_>,
24        field: &Positioned<Field>,
25    ) -> ServerResult<Value> {
26        self.as_ref().resolve(ctx, field).await
27    }
28}
29
30#[cfg(test)]
31mod test {
32    use std::borrow::Cow;
33
34    use crate::*;
35
36    #[tokio::test]
37    async fn test_cow_type() {
38        struct Query {
39            obj: MyObj,
40        }
41
42        #[derive(SimpleObject, Clone)]
43        #[graphql(internal)]
44        struct MyObj {
45            a: i32,
46            b: i32,
47        }
48
49        #[Object(internal)]
50        impl Query {
51            async fn value1(&self) -> Cow<'_, str> {
52                Cow::Borrowed("abc")
53            }
54
55            async fn value2(&self) -> Cow<'_, str> {
56                Cow::Owned("def".to_string())
57            }
58
59            async fn obj1(&self) -> Cow<'_, MyObj> {
60                Cow::Borrowed(&self.obj)
61            }
62
63            async fn obj2(&self) -> Cow<'_, MyObj> {
64                Cow::Owned(MyObj { a: 300, b: 400 })
65            }
66        }
67
68        let query = r#"{
69            value1
70            value2
71            obj1 {
72                a b
73            }
74            obj2 {
75                a b
76            }
77        }"#;
78        let schema = Schema::new(
79            Query {
80                obj: MyObj { a: 100, b: 200 },
81            },
82            EmptyMutation,
83            EmptySubscription,
84        );
85
86        assert_eq!(
87            schema.execute(query).await.into_result().unwrap().data,
88            value!({
89             "value1": "abc",
90             "value2": "def",
91             "obj1": {"a": 100, "b": 200},
92             "obj2": {"a": 300, "b": 400},
93            })
94        );
95    }
96}
async_graphql/types/external/cow.rs

async_graphql/types/external/
cow.rs
