Fixes #4086 - Custom sort on select returns "undefined method `merge' " for older objects.

db/migrate/20220517065751_issue4086_fix_historical_options.rb

@@ -0,0 +1,15 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+class Issue4086FixHistoricalOptions < ActiveRecord::Migration[5.0]
+  def change
+    # return if it's a new setup
+    return if !Setting.exists?(name: 'system_init_done')
+
+    ObjectManager::Attribute.find_each do |attribute|
+      next if !%r{^(multi|tree_)?select$}.match?(attribute.data_type)
+
+      attribute.data_option[:historical_options] = ObjectManager::Attribute.data_options_hash(attribute.data_option[:historical_options] || {})
+      attribute.save
+    end
+  end
+end

spec/db/migrate/issue_4086_fix_historical_options_spec.rb

@@ -0,0 +1,33 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+require 'rails_helper'
+
+RSpec.describe Issue4086FixHistoricalOptions, type: :db_migration do
+  let(:expected) do
+    {
+      'Sonstiges' => 'Sonstiges',
+      'Hardware'  => 'Hardware',
+      'Software'  => 'Software',
+    }
+  end
+
+  let(:attribute) do
+    attribute = create(:object_manager_attribute_select)
+    attribute.data_option[:historical_options] = [
+      { 'name' => 'Sonstiges', 'value' => 'Sonstiges' },
+      { 'name' => 'Hardware', 'value' => 'Hardware' },
+      { 'name' => 'Software', 'value' => 'Software' }
+    ]
+    attribute.save
+    attribute
+  end
+
+  before do
+    attribute
+  end
+
+  it 'does fix the broken historical_options' do
+    migrate
+    expect(attribute.reload.data_option[:historical_options]).to eq(expected)
+  end
+end