如何修复Ruby on Rails中的控制器错误并启动并运行Paperclip

Question

I have been trying for quite a while to get Paperclip up and running on my website and have followed the step-by-step process outlined on github multiple times and it still won't work. I really need to get this up and running as soon as possible. When I run the code through localhost, I get the message "undefined method `id' for nil:NilClass." This is located in line 20 (commented below). Why doesn't it appear as an error for the identical line under the owners method?

class SurveysController < ApplicationController
    def new
        @survey = Survey.new
    end

    def create
    end

    def survey_params
        params.require(:survey).permit(:name, :email, :password)
    end

    def owners
        @survey = Survey.new(survey_params)
        @survey.user_id=current_user.id
        @survey.save
    end

    def seeker
        @survey = Survey.new
        @survey.user_id=current_user.id   # line with the error (line 20)
        @survey.save
    end

    private

        def survey_params
            params.require(:survey).permit(:first_name, :last_name, :email, :looking_for, :moving_to, :gender, :coed, :age, :roommate_type, :housing_type, :roommates_estimate, :roommates_amount, :roommates_group, :roommates_names, :max_rent, :move_in, :move_out, :bedrooms, :amenities, :apartment_pet, :roommate_pet, :hometown, :school, :company, :terms, :avatar, :wake_up, :bedtime, :smoke, :smokeoften, :smokesocially, :smokequit, :drink, :drinkoften, :drinksocially, :drinkquit, :drugs, :drugsoften, :drugssocially, :drugsquit, :interest, :sexualactivity, :sexprivacy, :roommatesexprivacy, :overnight, :overnightoften, :roommateovernight, :realty, :availability, :rent, :address, :otherroom, :age_min, :age_max, :age_mode, :pad_photo, :user_status, :sociability, :tidiness, :question, :noise, :political, :religion, :user_id)
        end

        def idcheck
        end
end

What am I doing wrong and how can I get Paperclip up and running? I would really appreciate any kind of assistance I can get with this because I have a pretty close deadline.

Answer 1

Where are you setting current_user ?

Generally this is set via a "sign_in" method or some such, eg:

app/helpers/sessions_helper.rb

module SessionsHelper
  def sign_in(user)
    # "permanent" = expires: 20.years.from_now.utc
    cookies.permanent[:remember_token] = user.remember_token
    self.current_user = user
  end

  def current_user=(user)
    @current_user = user
  end

  def current_user
    return unless cookies[:remember_token]
    @current_user ||= User.find_by(remember_token: cookies[:remember_token])
  end
end

Your specific methods likely vary, but that general pattern is often assumed to be in place in your project. Wherever you handle login flow, the current user should be set to some variable that you can refer to via your controllers. You need to make sure you're setting and using that variable.

Additionally, you should have a before_filter in the controller to ensure only logged-in users can access these actions.

Answer 2

do you also use Devise?

if yes,

please add

before_filter :authenticate_user!, only: [:seeker]

after

class SurveysController < ApplicationController

then Devise will ask you login before you do the seeker action.

If you don't use devise, would you mind post your Gemfile or let me know where did you get this current_suer