Initial plan

app/controllers/api/v1/accounts_controller.rb

@@ -92,7 +92,8 @@ class Api::V1::AccountsController < Api::BaseController
   end
 
   def settings_params
-    params.permit(:auto_resolve_after, :auto_resolve_message, :auto_resolve_ignore_waiting, :audio_transcriptions, :auto_resolve_label)
+    params.permit(:auto_resolve_after, :auto_resolve_message, :auto_resolve_ignore_waiting, :audio_transcriptions, :auto_resolve_label,
+                  conversation_required_attributes: [])
   end
 
   def check_signup_enabled

app/models/account.rb

@@ -37,7 +37,11 @@ class Account < ApplicationRecord
         'auto_resolve_message': { 'type': %w[string null] },
         'auto_resolve_ignore_waiting': { 'type': %w[boolean null] },
         'audio_transcriptions': { 'type': %w[boolean null] },
-        'auto_resolve_label': { 'type': %w[string null] }
+        'auto_resolve_label': { 'type': %w[string null] },
+        'conversation_required_attributes': {
+          'type': %w[array null],
+          'items': { 'type': 'string' }
+        }
       },
     'required': [],
     'additionalProperties': true
@@ -55,7 +59,7 @@ class Account < ApplicationRecord
                  attribute_resolver: ->(record) { record.settings }
 
   store_accessor :settings, :auto_resolve_after, :auto_resolve_message, :auto_resolve_ignore_waiting
-  store_accessor :settings, :audio_transcriptions, :auto_resolve_label
+  store_accessor :settings, :audio_transcriptions, :auto_resolve_label, :conversation_required_attributes
 
   has_many :account_users, dependent: :destroy_async
   has_many :agent_bot_inboxes, dependent: :destroy_async

app/models/custom_attribute_definition.rb

@@ -45,6 +45,7 @@ class CustomAttributeDefinition < ApplicationRecord
   belongs_to :account
   after_update :update_widget_pre_chat_custom_fields
   after_destroy :sync_widget_pre_chat_custom_fields
+  after_destroy :cleanup_conversation_required_attributes
 
   private
 
@@ -56,6 +57,13 @@ class CustomAttributeDefinition < ApplicationRecord
     ::Inboxes::UpdateWidgetPreChatCustomFieldsJob.perform_later(account, self)
   end
 
+  def cleanup_conversation_required_attributes
+    return unless conversation_attribute? && account.conversation_required_attributes&.include?(attribute_key)
+
+    account.conversation_required_attributes = account.conversation_required_attributes - [attribute_key]
+    account.save!
+  end
+
   def attribute_must_not_conflict
     model_keys = attribute_model.to_sym == :conversation_attribute ? :conversation : :contact
     return unless attribute_key.in?(STANDARD_ATTRIBUTES[model_keys])

spec/models/custom_attribute_definition_spec.rb

@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe CustomAttributeDefinition do
+  describe 'callbacks' do
+    describe '#cleanup_conversation_required_attributes' do
+      let(:account) { create(:account) }
+      let(:attribute_key) { 'test_attribute' }
+      let!(:custom_attribute) do
+        create(:custom_attribute_definition,
+               account: account,
+               attribute_key: attribute_key,
+               attribute_model: 'conversation_attribute')
+      end
+
+      context 'when conversation attribute is in required attributes list' do
+        before do
+          account.update!(conversation_required_attributes: [attribute_key, 'other_attribute'])
+        end
+
+        it 'removes the attribute from conversation_required_attributes when destroyed' do
+          expect { custom_attribute.destroy! }
+            .to change { account.reload.conversation_required_attributes }
+            .from([attribute_key, 'other_attribute'])
+            .to(['other_attribute'])
+        end
+      end
+
+      context 'when attribute is contact_attribute' do
+        let!(:contact_attribute) do
+          create(:custom_attribute_definition,
+                 account: account,
+                 attribute_key: attribute_key,
+                 attribute_model: 'contact_attribute')
+        end
+
+        before do
+          account.update!(conversation_required_attributes: [attribute_key])
+        end
+
+        it 'does not modify conversation_required_attributes when destroyed' do
+          expect { contact_attribute.destroy! }
+            .not_to(change { account.reload.conversation_required_attributes })
+        end
+      end
+    end
+  end
+end