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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