Fix ActiveStorage type detection for email files

Fixes #555

lib/active_storage/service/cloudinary_service.rb

@@ -255,7 +255,7 @@ def content_type_to_resource_type(content_type)
       case type
       when 'video', 'audio'
         'video'
-      when 'text'
+      when 'text', 'message'
         'raw'
       when 'application'
         case subtype

spec/account_api_spec.rb

@@ -238,7 +238,7 @@
       expect(key_del_res["message"]).to eq "ok"
 
       named_key_del_res = @api.delete_access_key(cloud_id, nil, named_key_name)
-      expect(named_key_del_res["message"]).to eq "sok"
+      expect(named_key_del_res["message"]).to eq "ok"
     end
   end
 end

spec/active_storage/database/setup.rb

@@ -7,6 +7,13 @@ class << self
     alias_method :load, :unsafe_load if YAML.respond_to? :unsafe_load
   end
 end
-ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
-ActiveRecord::Base.connection.migration_context.migrate
+
+connection = ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
+if connection.respond_to?(:migration_context)
+  connection.migration_context.migrate
+else
+  # Fallback for older versions of Rails
+  ActiveRecord::Base.connection.migration_context.migrate
+end
+
 ActiveStorageCreateUsers.migrate(:up)

spec/active_storage/service/cloudinary_service_spec.rb

@@ -108,7 +108,7 @@
 
     it "should set raw resource_type for raw formats" do
       key = SecureRandom.base58(24)
-      types = %w[text/* application/*]
+      types = %w[text/* application/* message/*]
 
       types.each do |content_type|
         url = @service.url_for_direct_upload(key, content_type: content_type)

spec/spec_helper.rb

@@ -1,5 +1,6 @@
 SUFFIX = ENV['TRAVIS_JOB_ID'] || rand(999999999).to_s
 
+require 'bundler/setup'
 require 'rspec'
 require 'rspec/retry'
 require 'rexml/parsers/ultralightparser'