swift - 如何将 Vapor 2 Swift 4 项目推送到 Heroku

Question

使用 Xcode 9 和 Swift 4 以及 vapor heroku push/vapor heroku init，我收到:

-----> Swift app detected
Cloning into 'swiftenv'...
Swift 3 Heroku Installer
🔢  Version: 3.1.1
🖥  Operating System: ubuntu1404
📦 Installing Swiftenv
Cloning into '/app/.swiftenv'...
🐦 Installing Swift
Downloading https://swift.org/builds/swift-3.1.1-release/ubuntu1604/swift-3.1.1-RELEASE/swift-3.1.1-RELEASE-ubuntu16.04.tar.gz
/tmp/swiftenv-3.1.1- /tmp/build_d
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
/tmp/build_d
3.1.1 has been installed.
✅  Done
-----> Installing clang-3.7.0
precompile
-----> Building Package ... this will take a while
swift-build: error: Package requires minimum Swift tools version 4.0.0. Current Swift tools version is 3.1.0
 !     Push rejected, failed to compile Swift app.
 !     Push failed

在 Package.swift 文件中它说:

// swift-tools-version:4.0

import PackageDescription

let package = Package(
    name: "name",
    products: [
        .library(name: "App", targets: ["App"]),
        .executable(name: "Run", targets: ["Run"])
    ],
    dependencies: [
        .package(url: "https://github.com/vapor/vapor.git", .upToNextMajor(from: "2.1.0")),
        .package(url: "https://github.com/vapor/fluent-provider.git", .upToNextMajor(from: "1.2.0")),
    ],
    targets: [
        .target(name: "App", dependencies: ["Vapor", "FluentProvider"],
                exclude: [
                    "Config",
                    "Public",
                    "Resources",
                ]),
        .target(name: "Run", dependencies: ["App"]),
        .testTarget(name: "AppTests", dependencies: ["App", "Testing"])
    ]
)

除此之外，它实际上是初始 api 模板项目。我错过了什么？非常感谢您的帮助。

Answer 1

项目模板最近更新为需要 Swift 4，但 Heroku buildpack 仍默认安装 Swift 3.1.1。在更新模板以解决这种情况之前，请执行以下操作:

1. 在项目根目录中创建一个名为 .swift-version 的文件，其中包含 4.0。
2. 提交并推送到 Heroku。

buildpack 现在将安装 Swift 4，您的项目将进行编译。

更新 (2017-11-13)

我已经更新了构建包，因此不再需要上述步骤。
没有固定版本的新应用程序和推送将使用 Swift 4.0.2。