Add support for smallvec crate

Cargo.toml

@@ -32,6 +32,7 @@ decimal = ["utoipa-gen/decimal"]
 yaml = ["serde_yaml"]
 uuid = ["utoipa-gen/uuid"]
 time = ["utoipa-gen/time"]
+smallvec = ["utoipa-gen/smallvec"]
 
 [dependencies]
 serde = { version = "1.0", features = ["derive"] }
@@ -49,6 +50,7 @@ rust_decimal = "1"
 rocket = "0.5.0-rc.1"
 uuid = "1"
 time = { version = "0.3.11", features = [ "serde-human-readable" ] }
+smallvec = { version = "1.9.0", features = [ "serde" ] }
 
 [workspace]
 members = [

README.md

@@ -76,6 +76,7 @@ and the `ipa` is _api_ reversed. Aaand... `ipa` is also awesome type of beer :be
   See the `value_type` in [component derive docs](https://docs.rs/utoipa/1.1.0/utoipa/derive.Component.html).
 * **uuid** Add support for [uuid](https://github.com/uuid-rs/uuid). `Uuid` type will be presented as `String` with
   format `uuid` in OpenAPI spec.
+* **smallvec** Add support for [smallvec](https://crates.io/crates/smallvec). `SmallVec` will be treated as `Vec`.
 
 Utoipa implicitly has partial support for `serde` attributes. See [docs](https://docs.rs/utoipa/1.1.0/utoipa/derive.Component.html#partial-serde-attributes-support) for more details.
 

src/lib.rs

@@ -72,6 +72,7 @@
 //!   See the `value_type` in [component derive docs][component_derive].
 //! * **uuid** Add support for [uuid](https://github.com/uuid-rs/uuid). `Uuid` type will be presented as `String` with
 //!   format `uuid` in OpenAPI spec.
+//! * **smallvec** Add support for [smallvec](https://crates.io/crates/smallvec). `SmallVec` will be treated as `Vec`.
 //!
 //! Utoipa implicitly has partial support for `serde` attributes. See [component derive][serde] for more details.
 //!

tests/component_derive_test.rs

@@ -1246,7 +1246,7 @@ fn derive_component_with_chrono_with_chrono_feature() {
 
 #[cfg(feature = "time")]
 #[test]
-fn derive_component_with_chrono_with_chrono_feature() {
+fn derive_component_with_time_feature() {
     use time::{Date, Duration, OffsetDateTime, PrimitiveDateTime};
 
     let times = api_doc! {
@@ -1774,3 +1774,31 @@ fn derive_component_with_raw_identifier() {
         })
     )
 }
+
+#[cfg(feature = "smallvec")]
+#[test]
+fn derive_component_with_smallvec_feature() {
+    use smallvec::SmallVec;
+
+    let bar = api_doc! {
+        struct Bar<'b> {
+            links: SmallVec<[&'b str; 2]>
+        }
+    };
+
+    assert_json_eq!(
+        bar,
+        json!({
+            "properties": {
+                "links": {
+                    "items": {
+                        "type": "string"
+                    },
+                    "type": "array",
+                }
+            },
+            "required": ["links"],
+            "type": "object"
+        })
+    )
+}

utoipa-gen/Cargo.toml

@@ -41,3 +41,4 @@ rocket_extras = ["regex", "lazy_static"]
 uuid = ["dep:uuid"]
 axum_extras = []
 time = []
+smallvec = []

utoipa-gen/src/schema.rs

@@ -44,6 +44,7 @@ impl<'t> TypeTree<'t> {
             Type::Reference(reference) => Self::get_type_paths(reference.elem.as_ref()),
             Type::Tuple(tuple) => tuple.elems.iter().flat_map(Self::get_type_paths).collect(),
             Type::Group(group) => Self::get_type_paths(group.elem.as_ref()),
+            Type::Array(array) => Self::get_type_paths(&array.elem),
             _ => abort_call_site!(
                 "unexpected type in component part get type path, expected one of: Path, Reference, Group"
             ),
@@ -155,7 +156,7 @@ impl<'t> TypeTree<'t> {
     fn get_generic_type(segment: &PathSegment) -> Option<GenericType> {
         match &*segment.ident.to_string() {
             "HashMap" | "Map" | "BTreeMap" => Some(GenericType::Map),
-            "Vec" => Some(GenericType::Vec),
+            "Vec" | "SmallVec" => Some(GenericType::Vec),
             "Option" => Some(GenericType::Option),
             "Cow" => Some(GenericType::Cow),
             "Box" => Some(GenericType::Box),