Refactor admin settings, add all service settings

app/controllers/admin/settings_controller.rb

@@ -4,6 +4,30 @@ class Admin::SettingsController < Admin::BaseController
   def index
   end
 
+  def update_settings
+    @errors = ActiveModel::Errors.new(Setting.new)
+    changed_keys = []
+
+    setting_params.keys.each do |key|
+      next if setting_params[key].nil? ||
+              (Setting.send(key).to_s == setting_params[key].strip)
+      changed_keys.push(key)
+      setting = Setting.new(var: key)
+      setting.value = setting_params[key].strip
+      unless setting.valid?
+        @errors.merge!(setting.errors)
+      end
+    end
+
+    if @errors.any?
+      render :index and return
+    end
+
+    changed_keys.each do |key|
+      Setting.send("#{key}=", setting_params[key].strip)
+    end
+  end
+
   private
 
   def set_current_section