[Rails] Re: Rails associations

It sounds like you're running up against database foreign key constraints: your model needs to have those id attributes filled in before you can save it. (This is often caught with validations at the rails application layer too, with `validates :vehicle_type, presence: true`)

This is one possible approach:

business = Business.first

car = VehicleType.find_by_name("car")

first_vehicle = Vehicle.new

first_vehicle.business = business

first_vehicle.vehicle_type = car

first_vehicle.save

Or another way:

first_vehicle = Vehicle.create do |v|

  v.business = business

  v.vehicle_type = car

end

Or:

first_vehicle = business.vehicles.build(vehicle_type: car)

first_vehicle.save

Or again:

first_vehicle = business.vehicles.create(vehicle_type: car)

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