none

gistfile1.rb

@brand1 = params[:brand][:name]
@model = params[:brand][:models_attributes]["0"]["name"]
@submodel = params[:brand][:models_attributes]["0"]["submodels_attributes"]["0"]["name"]
@style = params[:brand][:models_attributes]["0"]["submodels_attributes"]["0"]["styles_attributes"]["0"]["name"]

a = Brand.find_or_create_by_name(@brand1)
b = Model.find_or_create_by_name(@model, :brand_id => a.id)
c = Submodel.find_or_create_by_name(@submodel, :model_id => b.id)
d = Style.new(:name => @style, :submodel_id => c.id)
d.save