*_attribute methods take String or Symbol

spec/active_record/has_aux_table_spec.rb

@@ -77,6 +77,14 @@ RSpec.describe HasAuxTable do
     )
   end
 
+  it "reads attributes with read_attribute" do
+    car = Car.create!(name: "Honda Civic", fuel_type: "gasoline")
+    expect(car.read_attribute("name")).to eq("Honda Civic")
+    expect(car.read_attribute(:name)).to eq("Honda Civic")
+    expect(car.read_attribute("fuel_type")).to eq("gasoline")
+    expect(car.read_attribute(:fuel_type)).to eq("gasoline")
+  end
+
   it "can be created as the base class" do
     vehicle = Vehicle.create(type: "Vehicle", name: "big tractor")
     expect(vehicle.attributes).to match(