Ruby on rails 在设备注册时创建空配置文件

我曾在rails应用程序中使用Desive进行身份验证，我希望用户能够注册，注册后能够编辑自己的个人资料。我已经跟随了堆栈上的其他答案，但是当我尝试使用默认的设计注册表单注册时，我得到了这个错误

NoMethodError in Devise::RegistrationsController#create

undefined method `create' for nil:NilClass

app/models/user.rb:17:in `create_profile'

我的User.rb如下所示

class User < ActiveRecord::Base
   devise :database_authenticatable, :registerable,
     :recoverable, :rememberable, :trackable, :validatable

   has_one :profile

   attr_accessible :login, :username, :email, :password, :password_confirmation, :remember_me, :profile_attributes

   attr_accessor :login
   accepts_nested_attributes_for :profile

   validates :username,  :uniqueness => { :case_sensitive => false }, :presence => true

   after_create :create_profile

   def create_profile
      self.profile.create
   end

   def self.find_first_by_auth_conditions(warden_conditions)
      conditions = warden_conditions.dup
      if login = conditions.delete(:login)
         where(conditions).where(["username = :value OR lower(email) = lower(:value)", { :value => login }]).first
      else
          where(conditions).first
      end
   end
 end

---

您需要使用

self.create\u profile

而不是

self.profile.create

for

有一个关联

范例

An Account class declares has_one :beneficiary, which will add:

Account#beneficiary (similar to Beneficiary.where(account_id: id).first)

Account#beneficiary=(beneficiary) (similar to beneficiary.account_id = account.id; beneficiary.save)

Account#build_beneficiary (similar to Beneficiary.new("account_id" => id))

Account#create_beneficiary (similar to b = Beneficiary.new("account_id" => id); b.save; b)

Account#create_beneficiary! (similar to b = Beneficiary.new("account_id" => id); b.save!; b)

更多文档
在Desive:：RegistrationsController#create中引发另一个错误SystemStackError。堆栈级别太深。它没有给出错误可能来自哪个文件的指示。
User
和
Profile
model之间必须来回触发循环回调。在rails控制台中检查它我将如何检查它？明白了，我在user.rb中更改了create_profile方法的名称以添加_profile。最后一个方法类似于def add_profile self.create_profile end
def edit
   @profile = current_user.profile
end

An Account class declares has_one :beneficiary, which will add:

Account#beneficiary (similar to Beneficiary.where(account_id: id).first)

Account#beneficiary=(beneficiary) (similar to beneficiary.account_id = account.id; beneficiary.save)

Account#build_beneficiary (similar to Beneficiary.new("account_id" => id))

Account#create_beneficiary (similar to b = Beneficiary.new("account_id" => id); b.save; b)

Account#create_beneficiary! (similar to b = Beneficiary.new("account_id" => id); b.save!; b)