Notify the user of missing attachments (#22401).

under certain (rare) circumstances it may happen that, when an issue or other
container is saved, added attachments have already been removed (i.e. by the
attachments:prune rake task). This patch adds a validation error to the
container in this case.

Patch by Jens Kraemer.

git-svn-id: http://svn.redmine.org/redmine/trunk@15378 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/plugins/acts_as_attachable/lib/acts_as_attachable.rb

@@ -34,6 +34,7 @@ module Redmine
                                  options.merge(:as => :container, :dependent => :destroy, :inverse_of => :container)
           send :include, Redmine::Acts::Attachable::InstanceMethods
           before_save :attach_saved_attachments
+          validate :warn_about_failed_attachments
         end
       end
 
@@ -82,6 +83,7 @@ module Redmine
             attachments = attachments.map(&:last)
           end
           if attachments.is_a?(Array)
+            @failed_attachment_count = 0
             attachments.each do |attachment|
               next unless attachment.is_a?(Hash)
               a = nil
@@ -90,7 +92,10 @@ module Redmine
                 a = Attachment.create(:file => file, :author => author)
               elsif token = attachment['token']
                 a = Attachment.find_by_token(token)
-                next unless a
+                unless a
+                  @failed_attachment_count += 1
+                  next
+                end
                 a.filename = attachment['filename'] unless attachment['filename'].blank?
                 a.content_type = attachment['content_type'] unless attachment['content_type'].blank?
               end
@@ -112,6 +117,12 @@ module Redmine
           end
         end
 
+        def warn_about_failed_attachments
+          if @failed_attachment_count && @failed_attachment_count > 0
+            errors.add :base, ::I18n.t('warning_attachments_not_saved', count: @failed_attachment_count)
+          end
+        end
+
         module ClassMethods
         end
       end