Rails:如何在表单的必填字段上禁用星号？

class CustomFormBuilder< ActionView::Helpers::FormBuilder
  def label(method, text = nil, options = {}, &block)
    text = text ? text.to_s : method.to_s.humanize
    text = text.gsub('*', '')
    super(method, text, options, &block)
  end
end

class UsersController< ApplicationController
  def new
    @user = User.new
    @user.build_profile
  end

  def create
    @user = User.new(user_params)
    if @user.save
      redirect_to @user
    else
      render :new
    end
  end

  private

  def user_params
    params.require(:user).permit(:email, :password, profile_attributes: [:first_name, :last_name])
  end
end

<%= form_with(model: user, local: true) do |form| %>
  <%= form.fields_for :profile do |profile_form| %>
    <%= profile_form.label :first_name %>
    <%= profile_form.text_field :first_name %>
  <% end %>
  <%= form.submit %>
<% end %>

  .required:after {
    content: '';
  }
</style>

<%= form_with(model: user, local: true) do |form| %>
  <%= form.fields_for :profile do |profile_form| %>
    <%= profile_form.label :first_name, 'First Name&ast;'.html_safe %>
    <%= profile_form.text_field :first_name %>
  <% end %>
  <%= form.submit %>
<% end %>