From 138448a8bbb3691d70e7f9a3e25097ac1599ffa0 Mon Sep 17 00:00:00 2001
From: Daiki Matoba <telnetstat@gmail.com>
Date: Mon, 9 Jan 2017 03:37:13 +0900
Subject: [PATCH] Add config option to set locale

---
 app/controllers/rails_admin/application_controller.rb     | 5 +++++
 lib/rails_admin/config.rb                                 | 3 +++
 .../rails_admin/application_controller_spec.rb            | 8 ++++++++
 3 files changed, 16 insertions(+)

diff --git a/app/controllers/rails_admin/application_controller.rb b/app/controllers/rails_admin/application_controller.rb
index ed7fee5cb0..9957c2ec49 100644
--- a/app/controllers/rails_admin/application_controller.rb
+++ b/app/controllers/rails_admin/application_controller.rb
@@ -16,6 +16,7 @@ class ApplicationController < Config.parent_controller.constantize
     before_action :_authenticate!
     before_action :_authorize!
     before_action :_audit!
+    before_action :_set_locale!
 
     helper_method :_current_user, :_get_plugin_name
 
@@ -58,6 +59,10 @@ def _audit!
       instance_eval(&RailsAdmin::Config.audit_with)
     end
 
+    def _set_locale!
+      I18n.locale = RailsAdmin.config.locale if RailsAdmin.config.locale
+    end
+
     def rails_admin_controller?
       true
     end
diff --git a/lib/rails_admin/config.rb b/lib/rails_admin/config.rb
index 2f185a02bb..f79da8b1a5 100644
--- a/lib/rails_admin/config.rb
+++ b/lib/rails_admin/config.rb
@@ -78,6 +78,9 @@ class << self
       # yell about fields that are not marked as accessible
       attr_accessor :yell_for_non_accessible_fields
 
+      # set locale for rails_admin
+      attr_accessor :locale
+
       # Setup authentication to be run as a before filter
       # This is run inside the controller instance so you can setup any authentication you need to
       #
diff --git a/spec/controllers/rails_admin/application_controller_spec.rb b/spec/controllers/rails_admin/application_controller_spec.rb
index 2150b4c388..35ef2fc656 100644
--- a/spec/controllers/rails_admin/application_controller_spec.rb
+++ b/spec/controllers/rails_admin/application_controller_spec.rb
@@ -39,4 +39,12 @@
       expect(controller.send(:rails_admin_controller?)).to be true
     end
   end
+
+  describe '#_set_locale!' do
+    it 'works with config' do
+      RailsAdmin.config.locale = :fr
+      controller.send(:_set_locale!)
+      expect(I18n.locale).to eq(:fr)
+    end
+  end
 end