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RESTful APIs提供了一种方式在应用中调用CRUD函数的方式。通常我们有一个URL对应数据模型，在这个URL基础上配合HTTP不同的请求Method，就可以执行相应的CRUD操作，例如

Create

POST https://localhost:8080/api/acronyms 创建一个新的缩略语

Swift
router.post("api", "acronyms") { (req) -> Future<Acronym> in
    return try req.content.decode(Acronym.self)
        .flatMap(to: Acronym.self) { (acronym) in
            return acronym.save(on: req)
    }
}

Retrieve

GET https://localhost:8080/api/acronyms 获取所有的缩略语数据

Swift
router.get("api", "acronyms") { (req) -> Future<[Acronym]> in
    return Acronym.query(on: req).all()
}
GET https://localhost:8080/api/acronyms/<ID> 获取指定ID的缩略语

需要数据模式遵循Parameter协议

Acronym.swift

Text Only
// 使可以作为请求参数
extension Acronym: Parameter {}

Swift
router.get("api", "acronyms", Acronym.parameter) { (req) -> Future<Acronym> in
    return try req.parameters.next(Acronym.self)
}

Update

PUT https://localhost:8080/api/acronyms/<ID> 更新指定ID的缩略语

Swift
router.put("api","acronyms",Acronym.parameter) { (req) -> Future<Acronym> in
    return try flatMap(to: Acronym.self, req.parameters.next(Acronym.self), req.content.decode(Acronym.self)) { (acronym, updateAcronym) -> Future<Acronym> in
        acronym.short = updateAcronym.short
        acronym.long = updateAcronym.long

        return acronym.save(on: req)
    }
}

Delete

DELETE https://localhost:8080/api/acronyms/<ID> 删除指定ID的缩略语

Swift
router.delete("api","acronyms", Acronym.parameter) { (req) -> Future<HTTPStatus>in
    return try req.parameters.next(Acronym.self)
    .delete(on: req)
    .transform(to: HTTPStatus.noContent)
}

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