NoMethodError在/ undefined方法`name'为nil：NilClass [英] NoMethodError at / undefined method `name' for nil:NilClass

问题描述

我已经尝试了许多解决方案，并提出了一个很好的解决方案，但仍然收到错误。我正在编辑我的整个问题。

我正在尝试使用friendly_id gem创建Friendly URL。
在我的项目中第一个用户需要用devise注册。
Devise将通过

model / user.rb

$ b将一些信息传递给个人资料模型$ b

 委托：age，：city，：region，：country，to：：profile 
  

我想让user.name成为Friendly_id候选人。我在我的个人资料模型中尝试过以下代码： -

  class Profile< ActiveRecord :: Base 
 
 extends FriendlyId 
 friendly_id：user_name，use：：slugged 
 
 def user_name 
 user.name 
 end 
  

但它是错误

NoMethodError at /
undefined方法'name'为nil：NilClass

现在提交用户表单后。

请说明可能的解决方案，解释。

我的User.rb看起来像

  require'open-uri'
 
 class User< ActiveRecord :: Base 
 paginates_per 10 
 
验证：name，presence：true，length：{maximum：200} 
 
范围：by_name， - > ）do 
 join（：profile）.where（'lower（name）LIKE？'，％＃{name.downcase}％）
 end 
 
委托：年龄，：：city，：region，：country，to：：profile 
 
 has_one：profile，depend：：destroy 
 acceptance_nested_attributes_for：profile 
 
 
 def self.new_with_session（params，session）
 session_params = {'profile_attributes'=> {}} 
 
 provider = session ['devise.provider'] 
如果提供者&& data = session [devise。＃{provider}] 
 session_params ['name'] = data [：name] if data [：name] 
 session_params ['email'] = data [：email ]如果data [：email] 
 session_params ['profile_attributes'] = 
 {头像：data [：image]}如果data [：image] 
 end 
 
 params.deep_merge！（session_params）
 super.tap do | user | 
如果auth = Authorization.find_from_session（session，provider）
 user.authorizations<<< auth 
 end 
 end 
 end 
 
 def password_required？ 
超级&& registered_manually？ 
 end 
 
 def registered_manually？ 
 encrypted_pa​​ssword.present？ 
 end 
 
 end 
  

而我的profile.rb看起来像

  class Profile< ActiveRecord :: Base 
 
 extends FriendlyId 
 friendly_id user.name，use：：slugged 
 
 
 belongs_to：user 
 acceptable_nested_attributes_for：user 
 
 
验证：网站，allow_blank：true，uri：true 
 
 def website =（url_str）
如果url_str.present？ 
 url_str =http：//＃{url_str}，除非url_str [/ ^ https？/] 
 write_attribute：website，url_str 
 end 
 end 
 
 end 
  

我认为问题在这里：

 请求参数
 {action=>new，controller=>users / registrations} 
请建议可能的解决方案和说明。 
  

和用户/注册：

  class Users :: RegistrationsController< Devise :: RegistrationsController 
 layout'land'
 
 def create 
 params [：user] [：profile_attributes] .delete（：place）
 
 end 
 protected 
 
 def after_sign_up_path_for（resource）
 welcome_path 
 end 
 end 
  

我在个人资料控制器中创建用户

  def load_profile 
 @ profile = Profile.friendly.find（params [：id]）
 if！@profile || @ profile.user.blocked_users.include？（current_user）
 redirect_to home_path 
 else 
 @user = @ profile.user 
 end 
 end 
  

@Rodrigo帮助我找出错误是由于Friendly_id无法创建与用户实例的链接的错误。

解决方案

此行出现错误：

  friendly_id user.name，use：：slugged 
  

变量用户不' t存在于配置文件类范围内。你应该使用这样的东西：

  friendly_id：user_name，use：：slugged 
 
 def user_name 
 user.name 
 end 
  




I have tried many solution and came up with good one but still getting error. I am editing my whole question.

I am trying to create Friendly URL with friendly_id gem. In my project First user need to signup with devise. Devise will pass some information to profile model with

model/user.rb

delegate :age, :city, :region, :country, to: :profile

I want to make user.name to be Friendly_id candidate. I have tried following code in my Profile model:-

 class Profile < ActiveRecord::Base

       extend FriendlyId
      friendly_id :user_name , use: :slugged 

       def user_name
       user.name
       end

But it is giving error

NoMethodError at / undefined method `name' for nil:NilClass

now After submitting user form.

Please suggest possible solution with explanation.

My User.rb looks like

require 'open-uri'

class User < ActiveRecord::Base
  paginates_per 10

  validates :name , presence: true, length: { maximum: 200 }

  scope :by_name, ->(name) do
    joins(:profile).where('lower(name) LIKE ?', "%#{name.downcase}%")
  end  

  delegate :age, :city, :region, :country, to: :profile

  has_one :profile, dependent: :destroy
  accepts_nested_attributes_for :profile


      def self.new_with_session(params, session)
        session_params = { 'profile_attributes' => {} }

        provider = session['devise.provider']
        if provider && data = session["devise.#{provider}"]
          session_params['name'] = data[:name] if data[:name]
          session_params['email'] = data[:email] if data[:email]
          session_params['profile_attributes'] =
            { avatar: data[:image] } if data[:image]
        end

        params.deep_merge!(session_params)
        super.tap do |user|
          if auth = Authorization.find_from_session(session, provider)
            user.authorizations << auth
          end
        end
      end

      def password_required?
        super && registered_manually?
      end

      def registered_manually?
        encrypted_password.present?
      end

    end

And my profile.rb looks like

class Profile < ActiveRecord::Base

   extend FriendlyId
    friendly_id user.name, use: :slugged 


  belongs_to :user
  accepts_nested_attributes_for :user


  validates :website, allow_blank: true, uri: true

  def website=(url_str)
    if url_str.present?
      url_str = "http://#{url_str}" unless url_str[/^https?/]
      write_attribute :website, url_str
    end
  end    

end

I think Problem is here:

Request parameters  
{"action"=>"new", "controller"=>"users/registrations"}
Please suggest possible solution and explanation. 

And users/registration:

class Users::RegistrationsController < Devise::RegistrationsController
  layout 'land'

  def create
    params[:user][:profile_attributes].delete(:place)

  end  
  protected

    def after_sign_up_path_for(resource)
      welcome_path
    end
end

I am creating user in profile controller

    def load_profile
      @profile = Profile.friendly.find(params[:id])
      if !@profile || @profile.user.blocked_users.include?(current_user)
        redirect_to home_path
      else
        @user = @profile.user
      end
    end

@Rodrigo helped me find out error that error is due to Friendly_id can't create link with user instance.

解决方案

There is an error on this line:

friendly_id user.name, use: :slugged 

The variable user doesn't exists at Profile class scope. You should use something like this:

friendly_id :user_name, use: :slugged 

def user_name
  user.name
end

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