将CakePHP安装从3.0.13升级到3.8

Question

我的CakePHP 3.0.13安装正常。在尝试跳转到4.x分支之前，我想升级到3.8。我启动了这个：composer require cakephp/cakephp:3.8.12，我得到下一个结果：

./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - cakephp/migrations 1.3.2 requires cakephp/cakephp 3.0.* -> no matching package found.
    - cakephp/migrations 1.3.2 requires cakephp/cakephp 3.0.* -> no matching package found.
    - cakephp/migrations 1.3.2 requires cakephp/cakephp 3.0.* -> no matching package found.
    - Installation request for cakephp/migrations 1.3.2 -> satisfiable by cakephp/migrations[1.3.2].

Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting
   see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details.

Read <https://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.

Installation failed, reverting ./composer.json to its original content.

似乎迁移软件包存在依赖性问题：Cake需要对Migrations进行升级，但是Migrations需要Cake保持3.0。*。在vendor/cakephp/migrations/composer.json中，我有：

    ...
    "require": {
        "php": ">=5.4",
        "robmorgan/phinx": ">=0.4.2 <0.5.0",
        "cakephp/cakephp": "3.0.*"
    },
    ...

我也尝试过使用composer升级Migrations，但是我遇到了相反的问题：cakephp应该被升级，所以我陷入了困境。有什么建议么？提前谢谢！

Answer 1

我想我已经找到问题了。正如@ndm和@ Nico-haase指出的，我已经审阅了composer.json文件。在其他软件包之间，我有：

...
"cakephp/cakephp": "~3.0.13",
"cakephp/migrations": "1.3.2",
...

...当我尝试将CakePHP升级到3.8.12时，我也应该升级了Migrations，因为Migrations 1.3.2运行在cake 3.0.13而不是3.8中。这就是为什么它不起作用。现在，我将3.8.12用于Cake，仅将@stable用于迁移。

...
"cakephp/cakephp": "~3.8.12",
"cakephp/migrations": "@stable",
...

升级了平台要求（php版本，libs等）后，我已经成功启动了composer install。非常感谢！