NoMethodError in Welcome#index - Getting Started with Rails - ruby-on-rails

Question

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Need help for this error. I can't figure out what's wrong with the code. I did research for related topics online but I can't find any solution. Below are the codes.
<!-- index.html.erb -->
<h1>Hello, Rails!</h1>
<%= link_to 'My Blog', controller: 'articles' %>
<%= link_to 'New article', new_article_path %>
<table>
<tr>
<th>Title</th>
<th>Text</th>
</tr>
<% #articles.each do |article| %>
<tr>
<td><%= article.title %></td>
<td><%= article.text %></td>
<td><%= link_to 'Show', article_path(article) %></td>
<td><%= link_to 'Edit', edit_article_path(article) %></td>
<td><%= link_to 'Destroy', article_path(article),
method: :delete,
data: { confirm: 'Are you sure?' } %></td>
</tr>
<% end %>
</table>
Here's the code from the controller.
# welcome_controller.rb
class WelcomeController < ApplicationController
def index
end
end
Config codes
# routes.rb
Rails.application.routes.draw do
get 'welcome/index'
resources :articles
root 'welcome#index'
end
Any help would be appreciated!

Answer 1

Undefined method each for nil:NilClass
The error is due to #articles is nil. You should define it in the welcome#index
class WelcomeController < ApplicationController
def index
#articles = Article.all
end
end
However you can tweak the index.html.erb to avoid such errors
<% unless #articles.blank? %>
<% #articles.each do |article| %>
<tr>
<td><%= article.title %></td>
<td><%= article.text %></td>
<td><%= link_to 'Show', article_path(article) %></td>
<td><%= link_to 'Edit', edit_article_path(article) %></td>
<td><%= link_to 'Destroy', article_path(article), method: :delete, data: { confirm: 'Are you sure?' } %></td>
</tr>
<% end %>
<% end %>

Answer 2

#Pavan's answer is correct and will solve your issue! As you getting started, I decided to write this answer to explain a little more what was happening:
You're routing root to 'welcome#index', i.e., when you hit http://localhost:300/ it you call method index from WelcomeController. We are used to call it index action from WelcomeController.
After run this method, it will (by default) render the file app/views/welcome/index.html.erb. See the pattern? The action name is the same as the file name and the controller name is the same as the folder name containing this file.
In this file you were using #articles. This is a variable that was defined in WelcomeController#index.
Your issue: this variable wasn't defined in the controller, resulting a nil object. I.e, it doesn't existed.
Solution: define this variable as #Pavan suggested.
But you could fall into the same exception again: if you haven't articles saved. To prevent this case you just need to check if #articles is nil, as #Pavan suggested too.
Hope this answer will clarify the issue and the suggestions to solve it!