Disable encryption for PostgreSQL

This will need to wait for Rails to support binary encrypted columns -
see rails/rails#52650.

Author: djmb

Rakefile

@@ -34,6 +34,11 @@ end
 configs.each do |config|
   namespace :test do
     task config do
+      if config.to_s.start_with?("encrypted") && ENV["TARGET_DB"] == "postgres"
+        puts "Skipping encrypted tests on PostgreSQL as binary encrypted columns are not supported by Rails yet"
+        return
+      end
+
       if config == :default
         sh("bin/rails test")
       else

lib/solid_cache/engine.rb

@@ -35,5 +35,13 @@ class Engine < ::Rails::Engine
     config.after_initialize do
       Rails.cache.setup! if Rails.cache.is_a?(Store)
     end
+
+    config.after_initialize do
+      if SolidCache.configuration.encrypt? && SolidCache::Record.connection.adapter_name == "PostgreSQL"
+        raise \
+          "Cannot enable encryption for Solid Cache: Active Record Encryption does not currently support " \
+          "encrypting binary columns on PostgreSQL"
+      end
+    end
   end
 end

test/unit/encryption_test.rb

@@ -40,7 +40,13 @@ class SolidCache::EncryptionTest < ActiveSupport::TestCase
 
   private
     def raw_first_value
-      SolidCache::Entry.connection.select_all("select * from solid_cache_entries order by id desc limit 1").first["value"]
+      raw = SolidCache::Entry.connection.select_all("select * from solid_cache_entries order by id desc limit 1").first["value"]
+
+      if ActiveRecord::Base.connection.adapter_name == "PostgreSQL"
+        ActiveRecord::Base.connection.unescape_bytea(raw)
+      else
+        raw
+      end
     end
 
     def first_value