Fixed 3578 - Can't create custom fields with name "type".

app/models/concerns/has_object_manager_attributes_validation.rb

@@ -5,6 +5,9 @@ module HasObjectManagerAttributesValidation
   extend ActiveSupport::Concern
 
   included do
+    # Disable table inheritance to allow columns with the name 'type'.
+    self.inheritance_column = nil
+
     validates_with ObjectManager::Attribute::Validation, on: %i[create update]
   end
 end

app/models/ticket.rb

@@ -89,8 +89,6 @@ class Ticket < ApplicationModel
 
   association_attributes_ignored :flags, :mentions
 
-  self.inheritance_column = nil
-
   attr_accessor :callback_loop
 
 =begin

spec/models/concerns/has_object_manager_attributes_validation_examples.rb

@@ -4,4 +4,20 @@ RSpec.shared_examples 'HasObjectManagerAttributesValidation' do
   it 'validates ObjectManager::Attributes' do
     expect(described_class.validators.map(&:class)).to include(ObjectManager::Attribute::Validation)
   end
+
+  context "when object attribute with name 'type' is used", db_strategy: :reset do
+    before do
+      skip('Skip context if a special type handling exists') if subject.try(:type_id)
+
+      if !ObjectManager::Attribute.exists?(object_lookup: ObjectLookup.find_by(name: described_class.name), name: 'type')
+        create(:object_manager_attribute_text, name: 'type', object_name: described_class.name)
+        ObjectManager::Attribute.migration_execute
+      end
+    end
+
+    it "check that the 'type' column can be updated" do
+      expect { subject.reload.update(type: 'Example') }.not_to raise_error
+    end
+
+  end
 end

spec/models/group_spec.rb

@@ -9,6 +9,8 @@ require 'models/concerns/has_ticket_create_screen_impact_examples'
 require 'models/concerns/has_xss_sanitized_note_examples'
 
 RSpec.describe Group, type: :model do
+  subject(:group) { create(:group) }
+
   it_behaves_like 'ApplicationModel'
   it_behaves_like 'CanBeImported'
   it_behaves_like 'HasObjectManagerAttributesValidation'