Rails教程学习中遭遇bcrypt (LoadError)问题求助

Hey there, let's work through this bcrypt issue you're hitting in your Rails tutorial project! That LoadError for bcrypt_ext is super common on Windows (especially with the mingw32 platform), even when you think the gem is installed correctly. Here are the steps to fix it:

Step 1: Uninstall and Reinstall bcrypt with Local Compilation #

The pre-built mingw32 version of bcrypt 3.1.11 sometimes ships with missing files. Instead, let's compile it locally to generate the correct bcrypt_ext library:

• First, uninstall the problematic version:

  gem uninstall bcrypt
  

  When prompted, select the 3.1.11 (x86-mingw32) version to remove.
• Next, install bcrypt using the Ruby platform flag to force local compilation:

  gem install bcrypt --platform=ruby -v 3.1.11
  

  Note: If this fails, you need to make sure you have the DevKit installed (it usually comes with RailsInstaller for Windows). If you haven't set it up yet:
  1. Navigate to your DevKit folder (e.g., C:\RailsInstaller\DevKit)
  2. Run these commands:

     ruby dk.rb init
     ruby dk.rb install
     

  This links the DevKit to your Ruby installation so it can compile native gems.

Step 2: Update Your Gemfile and Bundle #

Make sure your Gemfile isn't forcing an incompatible platform for bcrypt:

• Open your Gemfile and ensure the bcrypt line looks like this (no platform restriction):

  gem 'bcrypt', '3.1.11'
  

• Run bundle to sync the changes:

  bundle install
  

Step 3: Clear Caches and Retest #

Sometimes old cached files can cause conflicts. Let's clean them up:

bundle clean --force
rails tmp:clear

Now run your tests again:

rails test

Step 4: Try Upgrading bcrypt (If Steps 1-3 Fail) #

If the 3.1.11 version still gives you trouble, try upgrading to a more recent stable release of bcrypt that has better Windows support:

• Update your Gemfile to:

  gem 'bcrypt', '~> 3.1.16'
  

• Run:

  bundle update bcrypt
  

Then retest your application.

Why This Happens #

The pre-compiled mingw32 gem for bcrypt 3.1.11 often has missing or corrupted bcrypt_ext binaries. Compiling the gem locally with the Ruby platform flag ensures the library is built specifically for your Windows environment, fixing the missing file error.

内容的提问来源于stack exchange，提问作者kart-able