如何在Windows环境下将Ruby 2.5升级至2.7并适配Rails 5.2.6（解决Rails未识别新版本问题）

Hey there! Let's sort out this Ruby version mismatch you're seeing—both locally and on Elastic Beanstalk (EB). Here's a step-by-step breakdown tailored to your setup:

1. Fix Local Ruby Version Mismatch #

The issue where your app directory still uses the old Ruby version usually happens because you're relying on system Ruby instead of a version manager. These tools let you switch Ruby versions per project, which is exactly what you need:

Use rbenv (Recommended) #

• First, install rbenv and the ruby-build plugin (if you haven't already). This makes installing and managing multiple Ruby versions straightforward.
• Navigate to your Rails app directory, then install Ruby 2.7.x (stick to a patch version like 2.7.8—it’s fully compatible with Rails 5.2.6):

  rbenv install 2.7.8
  

• Set this directory to use Ruby 2.7.8 permanently:

  rbenv local 2.7.8
  

• Restart your terminal to apply changes, then verify:

  ruby -v # Should output 2.7.8
  

• Reinstall bundler and your gems to align with the new Ruby version:

  gem install bundler
  bundle install
  

If you prefer rvm #

• Install rvm, then install Ruby 2.7.8:

  rvm install 2.7.8
  

• Set the project to use this version by default:

  rvm use 2.7.8 --default
  

• Follow the same bundler/gem reinstall steps above.

2. Configure Elastic Beanstalk to Use Ruby 2.7 #

EB won’t automatically pick up your local Ruby version—you need to explicitly tell it which version to use:

Step 1: Update your Gemfile #

Add this line at the top of your Gemfile to specify the required Ruby version:

ruby '2.7.8'

Step 2: Add EB Configuration #

Create a .ebextensions folder in your project root (if it doesn’t exist), then make a file called ruby_version.config with this content:

option_settings:
  # Set Ruby version for the EB environment
  - namespace: aws:elasticbeanstalk:application:environment
    option_name: RUBY_VERSION
    value: 2.7.8
  # Ensure Rails environment is set correctly
  - namespace: aws:elasticbeanstalk:container:ruby:rails
    option_name: RailsEnv
    value: production # Replace with your environment (staging, etc.)

Step 3: Lock Gems for Linux #

EB runs on Linux, so make sure your Gemfile.lock includes dependencies for the Linux platform:

bundle lock --add-platform x86_64-linux

3. Verify Before Deployment #

• Run bundle exec ruby -v locally to confirm your app is using Ruby 2.7.8.
• If you have the EB CLI installed, use the local testing tool to simulate deployment:

  eb local run
  

  This lets you check if the Ruby version is correct in a mock EB environment before pushing changes.

Quick Compatibility Note #

Rails 5.2.6 is fully compatible with Ruby 2.7—you shouldn’t run into major issues. Just double-check that any custom gems in your project also support Ruby 2.7 (most popular gems do).

内容的提问来源于stack exchange，提问作者MSC