Add safe navigation to file_formats method

app/graphql/types/record_type.rb

@@ -217,7 +217,7 @@ def publication_information
     end
 
     def file_formats
-      @object['file_formats'].uniq
+      @object['file_formats']&.uniq
     end
 
     def imprint

test/graphql/types/record_type_test.rb

@@ -0,0 +1,33 @@
+require 'test_helper'
+
+class RecordTypeTest < ActiveSupport::TestCase
+  # Test that file_formats handles missing key gracefully
+  test 'file_formats returns nil when file_formats key is missing' do
+    record_data = { 'title' => 'Test Record' }
+    record_type = Types::RecordType.send(:new, record_data, {})
+
+    result = record_type.file_formats
+    assert_nil result, 'file_formats should return nil when key is missing'
+  end
+
+  # Test that file_formats handles explicit nil gracefully
+  test 'file_formats returns nil when file_formats is nil' do
+    record_data = { 'title' => 'Test Record', 'file_formats' => nil }
+    record_type = Types::RecordType.send(:new, record_data, {})
+
+    result = record_type.file_formats
+    assert_nil result, 'file_formats should return nil when value is nil'
+  end
+
+  # Test that file_formats works correctly when data is present
+  test 'file_formats returns unique formats when present' do
+    record_data = {
+      'title' => 'Test Record',
+      'file_formats' => %w[PDF PDF EPUB PDF]
+    }
+    record_type = Types::RecordType.send(:new, record_data, {})
+
+    result = record_type.file_formats
+    assert_equal %w[PDF EPUB], result, 'file_formats should return unique values'
+  end
+end