如何将数据保存到Rails中的多个表中

# app/models/user.rb
class User < ApplicationRecord
  has_one :profile
  accepts_nested_attributes_for :profile
end

# app/models/profile.rb
class Profile < ApplicationRecord
  belongs_to :user
end

# app/controllers/users_controller.rb
class UsersController < ApplicationController
  def create
    @user = User.new(user_params)
    if @user.save
      redirect_to @user, notice: 'User was successfully created.'
    else
      render :new
    end
  end

  private

  def user_params
    params.require(:user).permit(:username, profile_attributes: [:bio])
  end
end

<!-- app/views/users/new.html.erb -->
<%= form_with model: @user, local: true do |form| %>
  <%= form.label :username %>
  <%= form.text_field :username %>

  <%= form.fields_for :profile do |profile_form| %>
    <%= profile_form.label :bio %>
    <%= profile_form.text_area :bio %>
  <% end %>

  <%= form.submit %>
<% end %>

Validation failed: Profile bio can't be blank