From c19d0ce000a37b8f852644f87b0fc48e37b155b5 Mon Sep 17 00:00:00 2001
From: kanarus <kanarus786@gmail.com>
Date: Mon, 11 Aug 2025 06:17:18 +0900
Subject: [PATCH] docs(openapi): documentation for `Schema` trait

---
 ohkami_openapi/src/lib.rs | 91 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)

diff --git a/ohkami_openapi/src/lib.rs b/ohkami_openapi/src/lib.rs
index 0bcbe6eb2..5fd5ce9f5 100644
--- a/ohkami_openapi/src/lib.rs
+++ b/ohkami_openapi/src/lib.rs
@@ -28,38 +28,129 @@ pub enum Inbound {
     Security { scheme: SecurityScheme, scopes: &'static [&'static str] },
 }
 
+/// handle the `schema` as a component schema named `name`.
+/// This is useful for reusing schemas in the OpenAPI document.
 pub fn component<T: schema::Type::SchemaType>(name: &'static str, schema: schema::Schema<T>) -> schema::Schema<T> {
     schema::Schema::component(name, schema)
 }
 
+/// `type: string`
 pub fn string() -> schema::Schema<schema::Type::string> {
     schema::Schema::string()
 }
+/// `type: number`
 pub fn number() -> schema::Schema<schema::Type::number> {
     schema::Schema::number()
 }
+/// `type: integer`
 pub fn integer() -> schema::Schema<schema::Type::integer> {
     schema::Schema::integer()
 }
+/// `type: boolean`
 pub fn bool() -> schema::Schema<schema::Type::bool> {
     schema::Schema::bool()
 }
+/// ```txt
+/// type: array
+/// items:
+///   type: ###`items`'s schema###
+/// ```
 pub fn array(items: impl Into<schema::SchemaRef>) -> schema::Schema<schema::Type::array> {
     schema::Schema::array(items)
 }
+/// `type: object`
 pub fn object() -> schema::Schema<schema::Type::object> {
     schema::Schema::object()
 }
+/// `anyOf: [...{schemas}]`
 pub fn any_of(schemas: impl schema::SchemaList) -> schema::Schema<schema::Type::any> {
     schema::Schema::any_of(schemas)
 }
+/// `allOf: [...{schemas}]`
 pub fn all_of(schemas: impl schema::SchemaList) -> schema::Schema<schema::Type::any> {
     schema::Schema::all_of(schemas)
 }
+/// `oneOf: [...{schemas}]`
 pub fn one_of(schemas: impl schema::SchemaList) -> schema::Schema<schema::Type::any> {
     schema::Schema::one_of(schemas)
 }
 
+/// # OpenAPI Schema trait
+/// 
+/// ## Required
+/// 
+/// - `schema() -> impl Into<schema::SchemaRef>`
+///   - this `impl Into<schema::SchemaRef>` mostly means `schema::Schema<{something}>`.
+/// 
+/// ## Implementation Notes
+/// 
+/// Generally, you can implement this trait for your types by `#[derive(Schema)]`.
+/// See it's documentation for more details.
+/// 
+/// But of course, you can implement it manually if you want to.
+/// In that case, start from **base schemas**:
+/// 
+/// - [`string()`](fn@string)
+/// - [`number()`](fn@number)
+/// - [`integer()`](fn@integer)
+/// - [`bool()`](fn@bool)
+/// - [`array({items})`](fn@array)
+/// - [`object()`](fn@object)
+/// - [`any_of({schemas})`](fn@any_of)
+/// - [`all_of({schemas})`](fn@all_of)
+/// - [`one_of({schemas})`](fn@one_of)
+/// 
+/// and, [`component({name}, {schema})`](fn@component) if you want to name and reuse
+/// the schema in the OpenAPI document.
+/// 
+/// ## Example
+/// 
+/// ```rust,ignore
+/// use ohkami::openapi;
+/// 
+/// #[derive(openapi::Schema)]
+/// struct MySchema {
+///     pub id: u32,
+///     pub name: String,
+///     pub age: Option<u8>,
+/// }
+/// /* equivalent to: */
+/// impl openapi::Schema for MySchema {
+///     fn schema() -> impl Into<openapi::schema::SchemaRef> {
+///         openapi::object()
+///             .property("id", openapi::integer().format("uint32"))
+///             .property("name", openapi::string())
+///             .optional("age", openapi::integer().format("uint8"))
+///     }
+/// }
+/// 
+/// #[derive(openapi::Schema)]
+/// #[openapi(component)]
+/// struct MyComponentSchema {
+///     pub id: u32,
+///     pub name: String,
+///     pub age: Option<u8>,
+/// }
+/// /* equivalent to: */
+/// impl openapi::Schema for MyComponentSchema {
+///     fn schema() -> impl Into<openapi::schema::SchemaRef> {
+///         openapi::component("MyComponentSchema",  openapi::object()
+///             .property("id", openapi::integer().format("uint32"))
+///             .property("name", openapi::string())
+///             .optional("age", openapi::integer().format("uint8"))
+///         )
+///     }
+/// }
+/// ```
+/// 
+/// ## Default Implementations
+/// 
+/// - `str`, `String`
+/// - `u8`, `u16`, `u32`, `u64`, `usize`
+/// - `i8`, `i16`, `i32`, `i64`, `isize`
+/// - `f32`, `f64`
+/// - `uuid::Uuid`
+/// - `Vec<S>`, `[S]`, `[S; N]`, `Cow<'_, S>`, `Arc<S>`, `&S` where `S: Schema`
 pub trait Schema {
     fn schema() -> impl Into<schema::SchemaRef>;
 }