Author: Alex Bevilacqua <alex@alexbevi.com>
Date:   Fri Aug 18 10:22:57 2023 -0400

    Add a mongocrypt_path_helper for use in the mongoid.yml

diff --git a/config/initializers/mongoid.rb b/config/initializers/mongoid.rb
index 7ceeac9..e249045 100644
--- a/config/initializers/mongoid.rb
+++ b/config/initializers/mongoid.rb
@@ -9,17 +9,35 @@ Mongoid.configure do
   # It is recommended to use config/mongoid.yml for most Mongoid-related
   # configuration, whenever possible, but if you prefer, you can set
   # configuration values here, instead:
-  #
+  #
   #   config.log_level = :debug
   #
   # Note that the settings in config/mongoid.yml always take precedence,
   # whatever else is set here.
 end
-
+
 # Enable Mongo driver query cache for Rack
 # Rails.application.config.middleware.use(Mongo::QueryCache::Middleware)
-
+
 # Enable Mongo driver query cache for ActiveJob
 # ActiveSupport.on_load(:active_job) do
 #   include Mongo::QueryCache::Middleware::ActiveJob
 # end
+
+# Identify the current environment based on the RUBY_PLATFORMS environment
+# variable, and use this to autopopulate the path to the crypt_shared
+# library at ./vendor/crypt_shared/mongo_crypt_v1.[dll|dynlib|so]
+#
+# If detection fails the default file extension will be Linux's .so
+def mongocrypt_path_helper
+  platform = RUBY_PLATFORM.downcase
+  ext = if RUBY_PLATFORM =~ /mswin32/
+    "dll"
+  elsif RUBY_PLATFORM =~ /darwin/
+    "dylib"
+  else
+    "so" # default to Linux
+  end
+
+  File.join(Rails.root, 'vendor', 'crypt_shared', "mongo_crypt_v1.#{ext}")
+end
\ No newline at end of file
diff --git a/config/mongoid.yml b/config/mongoid.yml
index 33b5f9b..a496f0f 100644
--- a/config/mongoid.yml
+++ b/config/mongoid.yml
@@ -26,9 +26,13 @@ development:
             # This app assumes that crypt shared library is located in the vendor/crypt_shared directory.
             # You can download the library from here:
             # https://www.mongodb.com/try/download/enterprise
-            # Please adjust the file path accordingly to your operating system
-            # (.so for Linux, .dylib for macOS, .dll for Windows)
-            crypt_shared_lib_path: <%= File.join(Rails.root, 'vendor', 'crypt_shared', 'mongo_crypt_v1.so')  %>
+            #
+            # The mongocrypt_path_helper method will attempt to fill in the
+            # path to the mongo_crypt_v1.[dll|so|dynlib] based on the detected
+            # environment, however this can manually be set via:
+            #
+            # <%= File.join(Rails.root, 'vendor', 'crypt_shared', "mongo_crypt_v1.<ext>") %>
+            crypt_shared_lib_path: <%= mongocrypt_path_helper  %>

   options:
     # This is recommended for auto encryption to work properly in development.