manufacture = Manufacture.create(name: 'Honda') manufacture.automobiles.create(name: 'Civic', year: 2018) Part.create(name: "Body Components, including trim", price: 1200.00, weight: 500.00) Part.create(name: "Doors", price: 100.00, weight: 25.00) Part.create(name: "Windows", price: 25.00, weight: 5.00) Part.create(name: "Audio/video devices", price: 500.00, weight: 2.50) Part.create(name: "Cameras", price: 100.00, weight: 0.25) Part.create(name: "Low voltage electrical supply system", price: 1500.00, weight: 2.00) Part.create(name: "Gauges and meters", price: 50.00, weight: 0.75) Part.create(name: "Ignition system", price: 125.00, weight: 1.00) Part.create(name: "Lighting and signaling system", price: 250.00, weight: 2.00) Part.create(name: "Sensors", price: 500.00, weight: 2.00) Part.create(name: "Starting system", price: 125.00, weight: 4.00) Part.create(name: "Electrical switches", price: 75.00, weight: 1.00) Part.create(name: "Car seat", price: 500.00, weight: 40.00) Part.create(name: "Braking system", price: 300.00, weight: 35.00) Part.create(name: "Engine components and parts", price: 1500.00, weight: 575.00) Part.create(name: "Engine cooling system", price: 250.00, weight: 50.00) Part.create(name: "Engine oil systems", price: 250.00, weight: 25.00) Part.create(name: "Exhaust system", price: 500.00, weight: 40.00) Part.create(name: "Fuel supply system", price: 750.00, weight: 10.00) Part.create(name: "Suspension and steering systems", price: 500.00, weight: 50.00) Part.create(name: "Transmission system", price: 750.00, weight: 250.00) Part.create(name: "Air conditioning system (A/C)", price: 500.00, weight: 100.00)