CODEWITHSUNDEEP
ruby-on-railsrubydevise
Ma YongChhin
Ma YongChhin

Reputation: 457

NoMethodError in Users::Sessions#new

I'm a new developer in ROR. I use devise authentication for sign_in or sign_up, it works very well, but when i select data(category or sub_category) from database in app/views/layouts/application.html.erb i get some errors as shown bellow:

NoMethodError in Users::Sessions#new

Showing C:/railsapp/facepro/app/views/layouts/application.html.erb where line #28 raised:

undefined method `each' for nil:NilClass

Extracted source (around line #28):    

 <% @categories.each do |category| %>
    <li><a href="#"><%= category.category_name %></a>
       <ul class="dropdown-menu">

please help me!

Upvotes: 1

Views: 1469

Answers (2)

Richard Peck
Richard Peck

Reputation: 76774

The accepted answer should not be accepted - it doesn't fix the core of the problem.

--

Devise

The core of your problem has nothing to do with Devise.

You clue is in the error itself:

Showing C:/railsapp/facepro/app/views/layouts/application.html.erb where line #28

Devise has absolutely no bearing on the application layout - it's only for user authentication. To fix this, you need to ensure you have the @categories variable defined every time you load the application layout

--

ApplicationController

To do this, you'll need to declare that variable each time you load a controller action. As every controller should inherit from the application controller, the way to do this is to use the before_action callback in your app/controllers/application_controller.rb file:

#app/controllers/application_controller.rb
Class ApplicationController < ActionController::Base
    before_action :set_categories

    private

    def set_categories
        @categories = Category.all
    end
end

Upvotes: 1

t56k
t56k

Reputation: 6981

Going to guess that you haven't defined @categories in Sessions#new.

In SessionsController you will need something like this:

def new
  @categories = Category.all
  ...
end

Upvotes: 0

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