Nutrient has_many Recommendation. Recommendation belongs_to Nutrient. Is this the proper way to find and set the nutrient/recommendation relationship as a recommendation is created?

gistfile1.rb

  def create
    nutrient_id = params[:recommendation][:nutrient_id]
    if nutrient_id.blank?
      #nutrient_id was blank in the submit, get other recommendation params and re-render 'new'
      params[:recommendation].delete(:nutrient_id)
      @recommendation=Recommendation.new(params[:recommendation])
      render 'new'
    else
      @nutrient = Nutrient.find(nutrient_id)
      if @nutrient
        #nutrient was found by id, create recommendation
        @recommendation = @nutrient.recommendations.build(params[:recommendation])
        if @recommendation.save
          redirect_to @recommendation
        else
          render 'new'
        end
      else
        #nutrient was not found by id, get other recommendation params and re-render 'new'
        params[:recommendation].delete(:nutrient_id)
        @recommendation = Recommendation.new(params[:recommendation])
        render 'new'
      end
    end
  end