如何在Rails中只使用Time数据类型？

class Event < ApplicationRecord
  attribute :event_time, :time
end

class CreateEvents < ActiveRecord::Migration[6.0]
  def change
    create_table :events do |t|
      t.time :event_time
      t.timestamps
    end
  end
end

<%= form_for @event do |f| %>
  <%= f.time_select :event_time %>
  <%= f.submit %>
<% end %>

def create
  @event = Event.new(event_params)
  # ...
end

private

def event_params
  params.require(:event).permit(:event_time)
end