Learning Ruby On Rails: Day 9
The tiny “Hello World” app has two pages that link to each other. It works!
Now to break it so I can see why it works.
First I added a typo in the code:
Time.now()(a Ruby method on a
Time object) to
Time.know()(a nonsense method on a
In the browser, the following appeared
Then I tried messing with the URL and in the browser. A Routing Error appeared:
These error messages are so helpful and clear. The Routing Error message even has an input field where you can search for the correct path:
What a dream.
So in my first few days of learning Ruby on Rails, I’ve done the following:
- created a tiny app
- created a tiny controller, at which time, Rails created a view template for each of the methods inside the tiny controller
- linked the views together
- practiced debugging problems in the code and in the URL
It’s been real.
I have a couple Q’s though:
- Can I create new methods in the controller in my text editor or do I have to do it via the terminal? I’m pretty sure I know the answer to this, but I like to ask all the questions.
- Why doesn’t the following code execute when I put it in the controller?
@addition = <%= 1 + 3 %>
Answer to Question 1: I can create new controller methods in the text editor! But then the view templates aren’t auto-created by Rails.
When I first created the controller, I typed
rails generate controller Say hello goodbye and the views for
goodbye were simultaneously created. If I run that command again with a new method name, I get a conflict error:
So I’ll add them via the text editor and then I’ll be sure to add the corresponding views.
Answer to Question 2: Because it’s erb! That’s gotta go in the
html.erb file, kid.
Next post, here.