Fix bug with assigned_to field twice and fallback values, if objects do not exist anymore

app/models/messenger.rb

@@ -184,41 +184,39 @@ class Messenger
       when 'title', 'subject', 'description'
         short = false
       when 'tracker'
-        tracker = Tracker.find(detail.value)
-        value = tracker.to_s if tracker.present?
+        value = object_field_value(Tracker, detail.value)
       when 'project'
-        project = Project.find(detail.value)
-        value = project.to_s if project.present?
+        value = object_field_value(Project, detail.value)
       when 'status'
-        status = IssueStatus.find(detail.value)
-        value = status.to_s if status.present?
+        value = object_field_value(IssueStatus, detail.value)
       when 'priority'
-        priority = IssuePriority.find(detail.value)
-        value = priority.to_s if priority.present?
+        value = object_field_value(IssuePriority, detail.value)
       when 'category'
-        category = IssueCategory.find(detail.value)
-        value = category.to_s if category.present?
+        value = object_field_value(IssueCategory, detail.value)
       when 'assigned_to'
-        user = User.find(detail.value)
-        value = user.to_s if user.present?
+        value = object_field_value(User, detail.value)
       when 'fixed_version'
-        fixed_version = Version.find(detail.value)
-        value = fixed_version.to_s if fixed_version.present?
+        value = object_field_value(Version, detail.value)
       when 'attachment'
         attachment = Attachment.find(detail.prop_key)
-        value = "<#{Messenger.object_url attachment}|#{markup_format(attachment.filename)}>" if attachment.present?
-        escape = false
+        value = if attachment.present?
+                  escape = false
+                  "<#{Messenger.object_url attachment}|#{markup_format(attachment.filename)}>"
+                else
+                  detail.prop_key.to_s
+                end
+
       when 'parent'
         issue = Issue.find(detail.value)
-        value = "<#{Messenger.object_url issue}|#{markup_format(issue)}>" if issue.present?
-        escape = false
-      end
-
-      if detail.property == 'cf' && field_format == 'version'
-        version = Version.find(detail.value)
-        value = version.to_s if version.present?
+        value = if issue.present?
+                  escape = false
+                  "<#{Messenger.object_url issue}|#{markup_format(issue)}>"
+                else
+                  detail.value.to_s
+                end
       end
 
+      value = object_field_value(Version, detail.value) if detail.property == 'cf' && field_format == 'version'
       value = if value.present?
                 if escape
                   markup_format(value)
@@ -244,6 +242,11 @@ class Messenger
 
     private
 
+    def object_field_value(klass, id)
+      obj = klass.find_by(id: id)
+      obj.nil? ? id.to_s : obj.to_s
+    end
+
     def extract_usernames(text)
       text = '' if text.nil?
       # messenger usernames may only contain lowercase letters, numbers,

lib/redmine_messenger/patches/issue_patch.rb

@@ -88,11 +88,7 @@ module RedmineMessenger
                         value: Messenger.markup_format(priority.to_s),
                         short: true }
           end
-          if assigned_to.present?
-            fields << { title: I18n.t(:field_assigned_to),
-                        value: Messenger.markup_format(assigned_to.to_s),
-                        short: true }
-          end
+
           attachment[:fields] = fields if fields.any?
 
           Messenger.speak(l(:label_messenger_issue_updated,