CODEWITHSUNDEEP
ruby-on-rails
Ishaan Brissette
Ishaan Brissette

Reputation: 1

NoMethodError in Articles#show but instance variables match? undefined method `title' for nil:NilClass

articles_controller.rb:

class ArticlesController < ApplicationController

    def show
        @article = Article.find(params[:id])
    end

end

show.html.erb:

<h1>Showing article details</h1>

<p><strong>Title: </strong><%= @article.title %></p>
<p><strong>Description: </strong><%= @article.description %></p>

schema.rb:

ActiveRecord::Schema.define(version: 2020_04_08_043002) do

  create_table "articles", force: :cascade do |t|
    t.string "title"
    t.text "description"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

end

routes.rb:

Rails.application.routes.draw do
  root 'pages#home'
  get 'about', to: 'pages#about'
  resources :articles, only: [:show]
end

New to Ruby so I'm not sure what I did wrong, any help is greatly appreciated!

Upvotes: 0

Views: 56

Answers (1)

govind_unnikrishnan
govind_unnikrishnan

Reputation: 98

I don't see any problem with the code. When you create a route like resources :articles, only: [:show] it generates a GET method like /articles/:id. So when you call the show action make sure you have value for id included in the path, like localhost:3000/articles/779 for example.

If the id is not present in the path then the controller doesn't know the value of params. ie params[:id] will be nil. This makes @article = nil. Thus @article.title leads to this error in your view. Please check if this is the possible error happening.

Upvotes: 1

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