在 Haskell Stack 项目中构建 yesod/amazonka 依赖项时遇到问题

Question

我正在尝试使用出色的 AWS SDK amazonka in the backend portion of an API built using the equally excellent web framework yesod，但我很难让这两个库的依赖项协同工作。

我用

开始了脚手架 yesod 项目

stack new my-project yesod-mongo

用最新版本的 yesod (1.6.0) 填充了我的 cabal 文件。天真地将依赖项 amazonka-core 和 amazonka-ssm （例如）添加到我的 cabal 文件中返回

Error: While constructing the build plan, the following exceptions were encountered:

In the dependencies for my-project-0.0.0:
    amazonka-core must match -any, but the stack configuration has no specified version
              (latest matching version is 1.5.0)
    amazonka-ssm must match -any, but the stack configuration has no specified version
             (latest matching version is 1.5.0)
needed since my-project is a build target.

按照建议，我尝试将 amazonka-core-1.5.0 和 amazonka-ssm-1.5.0 添加到 extra-deps 下的 stack.yaml 文件中，但这不起作用：

Warning: WARNING: /home/ubuntu/my-project/my-project.cabal was modified manually.
     Ignoring package.yaml in favor of cabal file. If you want to use package.yaml
     instead of the cabal file, then please delete the cabal file.

Error: While constructing the build plan, the following exceptions were encountered:

In the dependencies for amazonka-core-1.5.0:
    conduit-1.3.0.2 from stack configuration does not match >=1.1 && <1.3 (latest
                matching version is 1.2.13.1)
needed due to my-project-0.0.0 -> amazonka-core-1.5.0

经过一番挖掘，似乎构建 yesod 模板的快照是 lts-11.6，但包含 amazonka 库的最新快照是 lts-10.9。因此，我尝试从 yesod-mongo 模板再次构建项目，但这次指定了一个较旧的快照：

ubuntu:~$ stack new my-project yesod-mongo --resolver lts-10.9
Downloading template "yesod-mongo" to create project "my-project" in my-project/ ...
Looking for .cabal or package.yaml files to use to init the project.
Using cabal packages:
- my-project/

Selected resolver: lts-10.9
Resolver 'lts-10.9' does not have all the packages to match your requirements.
    classy-prelude version 1.3.1 found
        - my-project requires ==1.4.*
    classy-prelude-conduit version 1.3.1 found
        - my-project requires ==1.4.*
    classy-prelude-yesod version 1.3.1 found
        - my-project requires ==1.4.*
    http-conduit version 2.2.4 found
        - my-project requires ==2.3.*
    persistent version 2.7.1 found
        - my-project requires ==2.8.*
    persistent-mongoDB version 2.6.0 found
        - my-project requires ==2.8.*
    yesod version 1.4.5 found
        - my-project requires ==1.6.*
    yesod-auth version 1.4.21 found
        - my-project requires ==1.6.*
    yesod-core version 1.4.37.3 found
        - my-project requires ==1.6.*
    yesod-form version 1.4.16 found
        - my-project requires ==1.6.*
    yesod-static version 1.5.3.1 found
        - my-project requires ==1.6.*
    Using package flags:
        - my-project: dev = False, library-only = False

现在我不知所措，还有点沮丧。看起来模板可能忽略了快照规范。所以，我的问题：

有没有一种方法可以从使用特定快照填充 cabal 和 stack.yaml 文件的模板构建脚手架站点？我还能做些什么来让它工作吗？

如果有帮助，我们很乐意提供更多信息。

编辑： 我还尝试降低上面代码段中包的版本，虽然这解决了构建依赖项的问题，但现在脚手架站点无法编译（大概是因为事情从 yesod-1.4.5 到 yesod-1.6.0 发生了有意义的变化）。

Answer 1

遗憾的是，您现在无法将 Commercial Haskell's 堆栈模板与 yesod 和 amazonka 一起使用。原因是：

让它工作的唯一方法是切换回旧版本的堆栈模板（那些实际上与堆栈解析器 10.9 一起工作的模板），然后使用它来创建一个新项目。幸运的是，Stack 支持自定义堆栈模板：

$ stack new my-project https://raw.githubusercontent.com/github-user-id/stack-templates/master/my-template.hsfiles

在 Haskell Stack 项目中构建 yesod/amazonka 依赖项时遇到问题

Trouble building yesod/amazonka dependencies in a Haskell Stack project

haskell

yesod

haskell-stack