1 files changed, 18 insertions, 0 deletions
diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index 991145bed4..d6c48b99f3 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -1571,4 +1571,22 @@ class BasicsTest < ActiveRecord::TestCase
 
     assert_not topic.id_changed?
   end
+
+  test "ignored columns are not present in columns_hash" do
+    cache_columns = Developer.connection.schema_cache.columns_hash(Developer.table_name)
+    assert_includes cache_columns.keys, 'first_name'
+    refute_includes Developer.columns_hash.keys, 'first_name'
+  end
+
+  test "ignored columns have no attirbute methods" do
+    refute Developer.new.respond_to?(:first_name)
+    refute Developer.new.respond_to?(:first_name=)
+    refute Developer.new.respond_to?(:first_name?)
+  end
+
+  test "ignored columns don't prevent explicit declaration of attribute methods" do
+    assert Developer.new.respond_to?(:last_name)
+    assert Developer.new.respond_to?(:last_name=)
+    assert Developer.new.respond_to?(:last_name?)
+  end
 end