fix: assignee_changed callback not getting triggered during conversation creation (#9334)

The reload method in our callback was refreshing the object and hence the saved_change_to_assignee_id? Method wasn't working in the following callbacks.

This impacted the listeners subscribing to the event `ASSIGNEE_CHANGE`, `TEAM_CHANGE` etc

app/dispatchers/async_dispatcher.rb

@@ -10,14 +10,15 @@ class AsyncDispatcher < BaseDispatcher
 
   def listeners
     [
+      AutomationRuleListener.instance,
       CampaignListener.instance,
       CsatSurveyListener.instance,
       HookListener.instance,
       InstallationWebhookListener.instance,
       NotificationListener.instance,
+      ParticipationListener.instance,
       ReportingEventListener.instance,
-      WebhookListener.instance,
-      AutomationRuleListener.instance
+      WebhookListener.instance
     ]
   end
 end

app/listeners/participation_listener.rb

@@ -0,0 +1,8 @@
+class ParticipationListener < BaseListener
+  include Events::Types
+
+  def assignee_changed(event)
+    conversation, _account = extract_conversation_and_account(event)
+    conversation.conversation_participants.find_or_create_by!(user_id: conversation.assignee_id) if conversation.assignee_id.present?
+  end
+end

app/models/concerns/assignment_handler.rb

@@ -38,7 +38,6 @@ module AssignmentHandler
 
   def process_assignment_changes
     process_assignment_activities
-    process_participant_assignment
   end
 
   def process_assignment_activities
@@ -49,10 +48,4 @@ module AssignmentHandler
       create_assignee_change_activity(user_name)
     end
   end
-
-  def process_participant_assignment
-    return unless saved_change_to_assignee_id? && assignee_id.present?
-
-    conversation_participants.find_or_create_by!(user_id: assignee_id)
-  end
 end

app/models/concerns/auto_assignment_handler.rb

@@ -15,7 +15,6 @@ module AutoAssignmentHandler
     return unless should_run_auto_assignment?
 
     ::AutoAssignment::AgentAssignmentService.new(conversation: self, allowed_agent_ids: inbox.member_ids_with_assignment_capacity).perform
-    conversation_participants.find_or_create_by(user_id: assignee_id) if assignee_id.present?
   end
 
   def should_run_auto_assignment?

app/models/conversation.rb

@@ -110,7 +110,7 @@ class Conversation < ApplicationRecord
 
   after_update_commit :execute_after_update_commit_callbacks
   after_create_commit :notify_conversation_creation
-  after_commit :set_display_id, unless: :display_id?
+  after_create_commit :load_attributes_created_by_db_triggers
 
   delegate :auto_resolve_duration, to: :account
 
@@ -257,8 +257,13 @@ class Conversation < ApplicationRecord
     assignee_id.present? && Current.user&.id == assignee_id
   end
 
-  def set_display_id
-    reload
+  def load_attributes_created_by_db_triggers
+    # Display id is set via a trigger in the database
+    # So we need to specifically fetch it after the record is created
+    # We can't use reload because it will clear the previous changes, which we need for the dispatcher
+    obj_from_db = self.class.find(id)
+    self[:display_id] = obj_from_db[:display_id]
+    self[:uuid] = obj_from_db[:uuid]
   end
 
   def notify_status_change

spec/enterprise/services/sla/evaluate_applied_sla_service_spec.rb

@@ -21,7 +21,7 @@ RSpec.describe Sla::EvaluateAppliedSlaService do
 
   describe '#perform - SLA misses' do
     context 'when first response SLA is missed' do
-      before { sla_policy.update(first_response_time_threshold: 1.hour) }
+      before { applied_sla.sla_policy.update(first_response_time_threshold: 1.hour) }
 
       it 'updates the SLA status to missed and logs a warning' do
         allow(Rails.logger).to receive(:warn)
@@ -42,7 +42,7 @@ RSpec.describe Sla::EvaluateAppliedSlaService do
 
     context 'when next response SLA is missed' do
       before do
-        sla_policy.update(next_response_time_threshold: 1.hour)
+        applied_sla.sla_policy.update(next_response_time_threshold: 1.hour)
         conversation.update(first_reply_created_at: 5.hours.ago, waiting_since: 5.hours.ago)
       end
 
@@ -64,7 +64,7 @@ RSpec.describe Sla::EvaluateAppliedSlaService do
     end
 
     context 'when resolution time SLA is missed' do
-      before { sla_policy.update(resolution_time_threshold: 1.hour) }
+      before { applied_sla.sla_policy.update(resolution_time_threshold: 1.hour) }
 
       it 'updates the SLA status to missed and logs a warning' do
         allow(Rails.logger).to receive(:warn)
@@ -89,7 +89,7 @@ RSpec.describe Sla::EvaluateAppliedSlaService do
     context 'when resolved conversation with resolution time SLA is missed' do
       before do
         conversation.resolved!
-        sla_policy.update(resolution_time_threshold: 1.hour)
+        applied_sla.sla_policy.update(resolution_time_threshold: 1.hour)
       end
 
       it 'does not update the SLA status to missed' do
@@ -100,7 +100,7 @@ RSpec.describe Sla::EvaluateAppliedSlaService do
 
     context 'when multiple SLAs are missed' do
       before do
-        sla_policy.update(first_response_time_threshold: 1.hour, next_response_time_threshold: 1.hour, resolution_time_threshold: 1.hour)
+        applied_sla.sla_policy.update(first_response_time_threshold: 1.hour, next_response_time_threshold: 1.hour, resolution_time_threshold: 1.hour)
         conversation.update(first_reply_created_at: 5.hours.ago, waiting_since: 5.hours.ago)
       end
 
@@ -119,7 +119,7 @@ RSpec.describe Sla::EvaluateAppliedSlaService do
   describe '#perform - SLA hits' do
     context 'when first response SLA is hit' do
       before do
-        sla_policy.update(first_response_time_threshold: 6.hours)
+        applied_sla.sla_policy.update(first_response_time_threshold: 6.hours)
         conversation.update(first_reply_created_at: 30.minutes.ago)
       end
 
@@ -142,7 +142,7 @@ RSpec.describe Sla::EvaluateAppliedSlaService do
 
     context 'when next response SLA is hit' do
       before do
-        sla_policy.update(next_response_time_threshold: 6.hours)
+        applied_sla.sla_policy.update(next_response_time_threshold: 6.hours)
         conversation.update(first_reply_created_at: 30.minutes.ago, waiting_since: nil)
       end
 
@@ -164,7 +164,7 @@ RSpec.describe Sla::EvaluateAppliedSlaService do
 
     context 'when resolution time SLA is hit' do
       before do
-        sla_policy.update(resolution_time_threshold: 8.hours)
+        applied_sla.sla_policy.update(resolution_time_threshold: 8.hours)
         conversation.resolved!
       end
 
@@ -182,7 +182,7 @@ RSpec.describe Sla::EvaluateAppliedSlaService do
   describe 'SLA evaluation with frt hit, multiple nrt misses and rt miss' do
     before do
       # Setup SLA Policy thresholds
-      sla_policy.update(
+      applied_sla.sla_policy.update(
         first_response_time_threshold: 2.hours, # Hit frt
         next_response_time_threshold: 1.hour, # Miss nrt multiple times
         resolution_time_threshold: 4.hours # Miss rt

spec/listeners/participation_listener_spec.rb

@@ -0,0 +1,26 @@
+require 'rails_helper'
+describe ParticipationListener do
+  let(:listener) { described_class.instance }
+  let!(:account) { create(:account) }
+  let!(:admin) { create(:user, account: account, role: :administrator) }
+  let!(:inbox) { create(:inbox, account: account) }
+  let!(:agent) { create(:user, account: account, role: :agent) }
+  let!(:conversation) { create(:conversation, account: account, inbox: inbox, assignee: agent) }
+
+  before do
+    create(:inbox_member, inbox: inbox, user: agent)
+    Current.user = nil
+    Current.account = nil
+  end
+
+  describe '#assignee_changed' do
+    let(:event_name) { :assignee_changed }
+    let!(:event) { Events::Base.new(event_name, Time.zone.now, conversation: conversation) }
+
+    it 'adds the assignee as a participant to the conversation' do
+      expect(conversation.conversation_participants.map(&:user_id)).not_to include(admin.id)
+      listener.assignee_changed(event)
+      expect(conversation.conversation_participants.map(&:user_id)).to include(agent.id)
+    end
+  end
+end

spec/models/concerns/auto_assignment_handler_shared.rb

@@ -26,10 +26,6 @@ shared_examples_for 'auto_assignment_handler' do
       expect(conversation.reload.assignee).to eq(agent)
     end
 
-    it 'adds assignee to conversation participants' do
-      expect(conversation.conversation_participants.map(&:user)).to include(agent)
-    end
-
     it 'will not auto assign agent if enable_auto_assignment is false' do
       inbox.update(enable_auto_assignment: false)
 

spec/models/message_spec.rb

@@ -107,7 +107,11 @@ RSpec.describe Message do
   end
 
   describe 'message create event' do
-    let(:conversation) { create(:conversation) }
+    let!(:conversation) { create(:conversation) }
+
+    before do
+      conversation.reload
+    end
 
     it 'updates the conversation first reply created at if it is the first outgoing message' do
       expect(conversation.first_reply_created_at).to be_nil