feat: Add assignee last seen to conversations (#3069)

- Adds assignee last seen attribute to conversations

app/controllers/api/v1/accounts/conversations_controller.rb

@@ -69,6 +69,7 @@ class Api::V1::Accounts::ConversationsController < Api::V1::Accounts::BaseContro
 
   def update_last_seen
     @conversation.agent_last_seen_at = DateTime.now.utc
+    @conversation.assignee_last_seen_at = DateTime.now.utc if assignee?
     @conversation.save!
   end
 
@@ -136,4 +137,8 @@ class Api::V1::Accounts::ConversationsController < Api::V1::Accounts::BaseContro
   def conversation_finder
     @conversation_finder ||= ConversationFinder.new(current_user, params)
   end
+
+  def assignee?
+    @conversation.assignee_id? && current_user == @conversation.assignee
+  end
 end

app/models/conversation.rb

@@ -5,6 +5,7 @@
 #  id                    :integer          not null, primary key
 #  additional_attributes :jsonb
 #  agent_last_seen_at    :datetime
+#  assignee_last_seen_at :datetime
 #  contact_last_seen_at  :datetime
 #  custom_attributes     :jsonb
 #  identifier            :string

app/views/api/v1/accounts/conversations/messages/index.json.jbuilder

@@ -4,6 +4,7 @@ json.meta do
   json.contact @conversation.contact.push_event_data
   json.assignee @conversation.assignee.push_event_data if @conversation.assignee.present?
   json.agent_last_seen_at @conversation.agent_last_seen_at
+  json.assignee_last_seen_at @conversation.assignee_last_seen_at
 end
 
 json.payload do

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

@@ -31,6 +31,7 @@ json.can_reply conversation.can_reply?
 json.timestamp conversation.last_activity_at.to_i
 json.contact_last_seen_at conversation.contact_last_seen_at.to_i
 json.agent_last_seen_at conversation.agent_last_seen_at.to_i
+json.assignee_last_seen_at conversation.assignee_last_seen_at.to_i
 json.unread_count conversation.unread_incoming_messages.count
 json.additional_attributes conversation.additional_attributes
 json.custom_attributes conversation.custom_attributes