Q:

Ruby on rails new object properties

i need to add to my user new objet some new properties that i will define when the form is submited by retrieve them from my database, but when i submited the new properties are nill and i dont know why
def create
  plan        =   params[:user][:plan]
  @plan_vars  =   Plan.find(plan)

    @user        = User.new(user_params, :plan_id => @plan_vars.id, :lessons => @plan_vars.lessons)
    if @user.save
        flash[:success] = "Usuario creado exitosamente"
      redirect_to   users_path
  else
        flash[:warning] =   "Ooops... algo ha fallado :O #{@user.errors}"
        redirect_to  new_user_path
    end
  end

here is the user params
def user_params
      params.require(:user).permit(:name, :email, :phone, :document, :password,
                                   :password_confirmation)
    end

A:

Here is what to do? 
Do this:
@user = User.new(user_params)
@user.plan_id = @plan_vars.id
@user.lessons = @plan_vars.lessons
@user.save

if nested form is used or @plan_vars returns array there results another type of error

