Chore: Fix Deserialisation Error in Jobs (#1683)

- Ignore Jobs on de-serialization error
- Show empty conversations in chat UI
Fixes: #1480

app/javascript/dashboard/components/widgets/conversation/ConversationCard.vue

@@ -35,6 +35,12 @@
           {{ this.$t(`${attachmentIconKey}.CONTENT`) }}
         </span>
       </p>
+      <p v-else class="conversation--message">
+        <i class="ion-android-alert"></i>
+        <span>
+          {{ this.$t(`CHAT_LIST.NO_MESSAGES`) }}
+        </span>
+      </p>
       <div class="conversation--meta">
         <span class="timestamp">
           {{ dynamicTime(chat.timestamp) }}

app/javascript/dashboard/i18n/locale/en/chatlist.json

@@ -79,6 +79,7 @@
     },
     "RECEIVED_VIA_EMAIL": "Received via email",
     "VIEW_TWEET_IN_TWITTER": "View tweet in Twitter",
-    "REPLY_TO_TWEET": "Reply to this tweet"
+    "REPLY_TO_TWEET": "Reply to this tweet",
+    "NO_MESSAGES": "No Messages"
   }
 }

app/jobs/application_job.rb

@@ -1,2 +1,6 @@
 class ApplicationJob < ActiveJob::Base
+  # https://api.rubyonrails.org/v5.2.1/classes/ActiveJob/Exceptions/ClassMethods.html
+  discard_on ActiveJob::DeserializationError do |_job, error|
+    Rails.logger.error("Skipping job because of ActiveJob::DeserializationError (#{error.message})")
+  end
 end

app/views/api/v1/conversations/partials/_conversation.json.jbuilder

@@ -11,7 +11,9 @@ json.meta do
 end
 
 json.id conversation.display_id
-if conversation.unread_incoming_messages.count.zero?
+if conversation.messages.count.zero?
+  json.messages []
+elsif conversation.unread_incoming_messages.count.zero?
   json.messages [conversation.messages.includes([{ attachments: [{ file_attachment: [:blob] }] }]).last.try(:push_event_data)]
 else
   json.messages conversation.unread_messages.includes([:user, { attachments: [{ file_attachment: [:blob] }] }]).last(10).map(&:push_event_data)