FAQ: Saving Data - Controller

This community-built FAQ covers the “Controller” exercise from the lesson “Saving Data”.

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This exercise can be found in the following Codecademy content:

Learn Ruby on Rails

FAQs on the exercise Controller

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What’s the difference between :

Rails.application.routes.draw do
	get '/messages' => 'messages#index'

and without “/”

Rails.application.routes.draw do
	get 'messages' => 'messages#index'

In the previous exercise we did this without “/” and it was fine
get 'home' => 'pages#welcome'
and now I’m getting an error when I run option #A, without “/”


I had problems, with both this section and the last. Here’s how to fix them:

  • If it mentions rerunning with --force, do it.
  • If it mentions rerunning with --trace, ignore it.
  • Instead of typing rake db:[whatever] type bin/rake db:[whatever]
  • If a prompt to overwrite with [Ynqdh] or similar options comes up, use h then y (I think; n gives you the entire solution at the start)

wouldn’t this cause an infinite loop?

def change
create_table :messages do |t|
t.text :content

where is the “route file”?

1 Like

I am trying " Generate a controller named Messages ."
Created file:
cat app/controllers/messages_controller.rb
class MessagesController < ApplicationController
The exercise shows error. Any mistake in file name? Any mistake in class?

Got the answer! I was working with the command window maximized, so did not see the error message that was prompting to use the command rails generate controller....

I was getting an error “uninitialized constant Messages” or something like that.

The code below was causing the error.

class MessagesController < ApplicationController
  def index
    @messages = Messages.all

The issue was Messages.all needed to be Message.all. It was a simple typo. Sharing incase anyone else runs into this issue :grin: