wintermeyer / rails-4.2-book Goto Github PK

The following code is duplicated (around line 945):

$ rake routes                                                                   
  Prefix Verb URI Pattern             Controller#Action
products GET  /products(.:format)     products#index
 product GET  /products/:id(.:format) products#show

Around line 55 there is the following code/output which doesn't make sense.

$ rails generate scaffold
^C^C/Users/xyz/.rvm/gems/ruby-2.2.0/gems/spring-1.3.4/lib/spring/application.rb:156:in `fork': Interrupt                                                        
  from /Users/xyz/.rvm/gems/ruby-2.2.0/gems/spring-1.3.4/lib/spring/application.rb:156:in `serve'
  from /Users/xyz/.rvm/gems/ruby-2.2.0/gems/spring-1.3.4/lib/spring/application.rb:131:in `block in run'
  from /Users/xyz/.rvm/gems/ruby-2.2.0/gems/spring-1.3.4/lib/spring/application.rb:125:in `loop'
  from /Users/xyz/.rvm/gems/ruby-2.2.0/gems/spring-1.3.4/lib/spring/application.rb:125:in `run'
  from /Users/xyz/.rvm/gems/ruby-2.2.0/gems/spring-1.3.4/lib/spring/application/boot.rb:18:in `<top (required)>'
  from /Users/xyz/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
  from /Users/xyz/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
  from -e:1:in `<main>'
MAC-00020:shop xyz$ rails generate scaffold

It seems that the command tree is not a standard on every bash console.

MAC-00020:shop richertd$ tree app/views/products/
-bash: tree: command not found

we could use find instead?

MAC-00020:shop richertd$ find app/views/products/
app/views/products/
app/views/products//_form.html.erb
app/views/products//edit.html.erb
app/views/products//index.html.erb
app/views/products//index.json.jbuilder
app/views/products//new.html.erb
app/views/products//show.html.erb
app/views/products//show.json.jbuilder

What do you think?

Change all usernames from richertd to xyz.

The following code in chapter06-routing.md needs to be fixed. See the screenshot.

Plus: The URLs are missing the 3000.

Please double check other chapters by browsing through https://www.gitbook.com/content/book/wintermeyer/rails-4-2-book for this kind of error too.

The pages can be accessed at the following URLs after starting the Rails
server with `rails server`:

-   <http://localhost:300/home/index>

    for `home_index GET /home/index(.:format)
              home#index`

-   <http://localhost:300/home/ping>

    for `home_ping GET /home/ping(.:format)
              home#ping`

-   <http://localhost:300/home/pong>

    for `home_pong GET /home/pong(.:format)
              home#pong`

Links should only be within the document or to external source which are unlikely to change (e.g. Wikipedia). There is a good chance that the old version of this book will be delete once the new one is online. Please remove the target link or change it to something internally.

In chapter 4 one of the first examples is to create a Country model. To proof that the model is created one has to type the model name into rails console, like so:

$> Country
My first output was: => Country (call 'Country.connection' to establish a connection)

So i searched the web and discovered that this is a feature that Rails version 4 and upwards is offering.
The connection to the database from the console is only established when needed.

To fix this, you can wether call the suggested Country.connection or simple call a function on this model like Country.count. After that the connection is established and the output is like expected.

My question. Should this behavior reflect in an added article to the book? Maybe a note under this example?

The chapter05-scaffolding.md should describe how one can deactivate the generating of JSON by deleting the jbuilder gem in the Gemfile.

The example should be an upgrade from Rails 4.2.0 to 4.2.1.

https://github.com/amooma/rails-4.2-book/blob/master/chapter2-ruby-basics.md

In chapter 3 the text says "So let's go to the URL http://localhost:3000 in the web browser." but the screenshot displays the URL http://0.0.0.0:3000. Please create a new screenshot and double check other screenshots.

Using localhost:3000 is a bit better than using 0.0.0.0:3000. On some OSes strange side effects happen and therefor localhost:3000 is preferred.

$ grep "http://0.0.0.0:3000" chapter03-first-steps-with-rails.md
So let's go to the URL <http://0.0.0.0:3000> or <http://localhost:3000>
<http://0.0.0.0:3000/hello-world>:
> <http://0.0.0.0:3000/hello-world.html>. But Rails regards HTML and
<http://0.0.0.0:3000/example/test>:
Visit that page with the URL <http://0.0.0.0:3000/example/test>
If we now go to the URL <http://0.0.0.0:3000/example/test>, we see the 2000:
<http://0.0.0.0:3000/game/ping>? Easy, you will say, we just change the
When we try to go to <http://0.0.0.0:3000/game/ping> we are
automatically redirected to <http://0.0.0.0:3000/game/pong> and in the
Redirected to http://0.0.0.0:3000/game/pong
<http://0.0.0.0:3000/game/ping>. We are redirected from ping to pong.
<http://0.0.0.0:3000/game/ping> in the browser:
If we go to <http://0.0.0.0:3000/game/pong> we still see the normal Pong
page. But if we go to <http://0.0.0.0:3000/game/ping> we are redirected
14:46 $

Book has to be changed to Book.column_names. Same for other occurrences of this functionallity:

$ rails console
Loading development environment (Rails 4.2.1)
>> Book
=> Book(id: integer, title: string, created_at: datetime, updated_at: datetime)
>> Author
=> Author(id: integer, book_id: integer, first_name: string, last_name: string, created_at: datetime, updated_at: datetime)
>> exit
$