Change the way to retrieve notifiable body

Using 'try' method to get notifiable is not working with translations
anymore. It was returning 'nil' always even when body translation is
populated.

app/models/concerns/notifiable.rb

@@ -12,6 +12,10 @@ module Notifiable
     end
   end
 
+  def notifiable_body
+    body if attribute_names.include?("body")
+  end
+
   def notifiable_available?
     case self.class.name
     when "ProposalNotification"

app/models/notification.rb

@@ -11,8 +11,9 @@ class Notification < ApplicationRecord
   scope :recent,      -> { order(id: :desc) }
   scope :for_render,  -> { includes(:notifiable) }
 
-  delegate :notifiable_title, :notifiable_available?, :check_availability,
+  delegate :notifiable_title, :notifiable_body, :notifiable_available?,
-           :linkable_resource, to: :notifiable, allow_nil: true
+           :check_availability, :linkable_resource,
+           to: :notifiable, allow_nil: true
 
   def mark_as_read
     update(read_at: Time.current)

app/views/notifications/_notification.html.erb

@@ -3,7 +3,7 @@
     <% locals = { notification: notification,
                   timestamp: notification.timestamp,
                   title: notification.notifiable_title,
-                  body: notification.notifiable.try(:body) } %>
+                  body: notification.notifiable_body } %>
     <% link_text = render partial: "/notifications/notification_body", locals: locals %>
     <%= link_to_if notification.link.present?, link_text, notification.link %>
   <% else %>