Properly handle i18n

lib/mongo_mapper.rb

@@ -4,6 +4,8 @@
 require 'active_model'
 require "mongo_mapper/railtie" if defined?(Rails)
 
+I18n.load_path << File.expand_path('../mongo_mapper/locale/en.yml', __FILE__)
+
 module MongoMapper
   autoload :Connection,             'mongo_mapper/connection'
 
@@ -16,6 +18,7 @@ module MongoMapper
   autoload :Document,               'mongo_mapper/document'
   autoload :EmbeddedDocument,       'mongo_mapper/embedded_document'
   autoload :Plugins,                'mongo_mapper/plugins'
+  autoload :Translation,            'mongo_mapper/translation'
   autoload :Version,                'mongo_mapper/version'
 
   module Middleware

lib/mongo_mapper/document.rb

@@ -36,6 +36,7 @@ module Document
 
     included do
       extend Plugins
+      extend Translation
     end
   end # Document
 end # MongoMapper

lib/mongo_mapper/embedded_document.rb

@@ -25,6 +25,7 @@ module EmbeddedDocument
 
     included do
       extend Plugins
+      extend Translation
     end
   end
 end

lib/mongo_mapper/locale/en.yml

@@ -0,0 +1,5 @@
+en:
+  mongo_mapper:
+    errors:
+      messages:
+        taken: "has already been taken"

lib/mongo_mapper/translation.rb

@@ -0,0 +1,10 @@
+# encoding: UTF-8
+module MongoMapper
+  module Translation
+    include ActiveModel::Translation
+
+    def i18n_scope
+      :mongo_mapper
+    end
+  end
+end

test/test_helper.rb

@@ -102,5 +102,3 @@ def drop_indexes(klass)
 MongoMapper.connection = Mongo::Connection.new('127.0.0.1', 27017, :logger => logger)
 MongoMapper.database = "mm-test-#{RUBY_VERSION.gsub('.', '-')}"
 MongoMapper.database.collections.each { |c| c.drop_indexes }
-
-I18n.load_path << File.expand_path('../fixtures/en.yml', __FILE__)

test/unit/test_translation.rb

@@ -0,0 +1,27 @@
+require 'test_helper'
+
+class TranslationTest < Test::Unit::TestCase
+  should "translate add mongo_mapper translations" do
+    I18n.translate("mongo_mapper.errors.messages.taken").should == "has already been taken"
+  end
+
+  should "set i18n_scope" do
+    Doc().i18n_scope.should == :mongo_mapper
+  end
+
+  should "translate document attributes" do
+    I18n.config.backend.store_translations(:en, :mongo_mapper => {:attributes => {:thing => {:foo => 'Bar'}}})
+    doc = Doc('Thing') do
+      key :foo, String
+    end
+    doc.human_attribute_name(:foo).should == 'Bar'
+  end
+
+  should "translate embedded document attributes" do
+    I18n.config.backend.store_translations(:en, :mongo_mapper => {:attributes => {:thing => {:foo => 'Bar'}}})
+    doc = EDoc('Thing') do
+      key :foo, String
+    end
+    doc.human_attribute_name(:foo).should == 'Bar'
+  end
+end