在Rails 5 belongs_to中，如何忽略id并按唯一名称创建通信？

class User < ApplicationRecord
  has_one :profile, foreign_key: 'user_name', dependent: :destroy
end

class Profile < ApplicationRecord
  belongs_to :user, foreign_key: 'user_name'
end

class ProfilesController < ApplicationController
  def create
    @user = User.find(params[:user_id])
    @profile = @user.build_profile(profile_params)
    if @profile.save
      # 保存成功的处理逻辑
    else
      # 保存失败的处理逻辑
    end
  end

  private

  def profile_params
    params.require(:profile).permit(:name, :age)
  end
end