1 files changed, 40 insertions, 0 deletions
diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index 1a1d4ce039..d79afa2ee9 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -1444,17 +1444,57 @@ class BasicsTest < ActiveRecord::TestCase
     cache_columns = Developer.connection.schema_cache.columns_hash(Developer.table_name)
     assert_includes cache_columns.keys, "first_name"
     assert_not_includes Developer.columns_hash.keys, "first_name"
+    assert_not_includes SubDeveloper.columns_hash.keys, "first_name"
+    assert_not_includes SymbolIgnoredDeveloper.columns_hash.keys, "first_name"
   end
 
   test "ignored columns have no attribute methods" do
     refute Developer.new.respond_to?(:first_name)
     refute Developer.new.respond_to?(:first_name=)
     refute Developer.new.respond_to?(:first_name?)
+    refute SubDeveloper.new.respond_to?(:first_name)
+    refute SubDeveloper.new.respond_to?(:first_name=)
+    refute SubDeveloper.new.respond_to?(:first_name?)
+    refute SymbolIgnoredDeveloper.new.respond_to?(:first_name)
+    refute SymbolIgnoredDeveloper.new.respond_to?(:first_name=)
+    refute SymbolIgnoredDeveloper.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?)
+    assert SubDeveloper.new.respond_to?(:last_name)
+    assert SubDeveloper.new.respond_to?(:last_name=)
+    assert SubDeveloper.new.respond_to?(:last_name?)
+    assert SymbolIgnoredDeveloper.new.respond_to?(:last_name)
+    assert SymbolIgnoredDeveloper.new.respond_to?(:last_name=)
+    assert SymbolIgnoredDeveloper.new.respond_to?(:last_name?)
+  end
+
+  test "ignored columns are stored as an array of string" do
+    assert_equal(%w(first_name last_name), Developer.ignored_columns)
+    assert_equal(%w(first_name last_name), SymbolIgnoredDeveloper.ignored_columns)
+  end
+
+  test "when #reload called, ignored columns' attribute methods are not defined" do
+    developer = Developer.create!(name: "Developer")
+    refute developer.respond_to?(:first_name)
+    refute developer.respond_to?(:first_name=)
+
+    developer.reload
+
+    refute developer.respond_to?(:first_name)
+    refute developer.respond_to?(:first_name=)
+  end
+
+  test "ignored columns not included in SELECT" do
+    query = Developer.all.to_sql.downcase
+
+    # ignored column
+    refute query.include?("first_name")
+
+    # regular column
+    assert query.include?("name")
   end
 end