Errata

The three examples for the 'where' method are shown with the 'all' keyword inserted, i.e.

Users.all.where("registered = true")
Users.all.where(:registered => true)
Users.all.where("email = ?", params[:email])

it looks like as of Rails 3 the 'all' should not be there, so examples should be:

Users.where("registered = true")
Users.where(:registered => true)
Users.where("email = ?", params[:email])

Note from the Author or Editor:
This is correct. We should delete .all in all three cases.

The path for wrapping_tidy_form_builder is said to be app/views/wrapping_tidy_form_builder.rb this should be app/helpers/wrapping_tidy_form_builder.rb as it is in the example code

Note from the Author or Editor:
Yes, please change the path as suggested.

On page 62 of 468, the link to the "reserved words" does not work or is no longer valid. Please update. Thanks

Note from the Author or Editor:
On page 17, please replace the oldwiki link with http://bparanj.blogspot.com/2011/07/reserved-words-in-rails.html .

The code in the PDF is written:

"
<%= stylesheet_link_tag 'hello', :media => "all", :type => "text/css", %>
"

That code produces an error. This is the correct code:

<%= stylesheet_link_tag 'hello', :media => "all", :type => "text/css" %>

Basically without the comma at the end.

Hope that helps.

:)

Note from the Author or Editor:
Yes, please delete the comma!

class Identity < OmniAuth::Identity::Models::ActiveRecord
attr_accessible :email, :name, :password_digest :password,
:password confirmation
end

There is a missing comma after password_digest, and an underscore missing from password_confirmation. it seems and it should be this:

class Identity < OmniAuth::Identity::Models::ActiveRecord
attr_accessible :email, :name, :password_digest, :password,
:password_confirmation
end

(submitted by Mike Lyons)

'rails testbed' command should be
'rails new testbed'

Note from the Author or Editor:
318 in the PDF, 320 in print. Yes, 'rails testbed' should be 'rails new testbed'.

Labels don't work because of prefix "person_" in Rails code.

Instead of:

<fieldset>
<legend>Country</legend>
<%= f.radio_button :country, 'USA' %> <%= f.label "person_country_usa", "USA" %><br />
<%= f.radio_button :country, 'Canada' %> <%= f.label "person_country_canada", "Canada" %><br />
<%= f.radio_button :country, 'Mexico' %> <%= f.label "person_country_mexico", "Mexico" %><br />
</fieldset>

<fieldset>
<legend>Country</legend>
<input id="person_country_usa" name="person[country]" type="radio" value="USA" />
<label for="person_person_country_usa">USA</label><br />
<input id="person_country_canada" name="person[country]" type="radio" value="Canada" />
<label for="person_person_country_canada">Canada</label><br />
<input id="person_country_mexico" name="person[country]" type="radio" value="Mexico" />
<label for="person_person_country_mexico">Mexico</label><br />
</fieldset>

it should be:

<fieldset>
<legend>Country</legend>
<%= f.radio_button :country, 'USA' %> <%= f.label "country_usa", "USA" %><br />
<%= f.radio_button :country, 'Canada' %> <%= f.label "country_canada", "Canada" %><br />
<%= f.radio_button :country, 'Mexico' %> <%= f.label "country_mexico", "Mexico" %><br />
</fieldset>

<fieldset>
<legend>Country</legend>
<input id="person_country_usa" name="person[country]" type="radio" value="USA" />
<label for="person_country_usa">USA</label><br />
<input id="person_country_canada" name="person[country]" type="radio" value="Canada" />
<label for="person_country_canada">Canada</label><br />
<input id="person_country_mexico" name="person[country]" type="radio" value="Mexico" />
<label for="person_country_mexico">Mexico</label><br />
</fieldset>

Note from the Author or Editor:
This is correct. Please change the code.

The paragraph states:

This will produce a checkbox with a class attribute:
<input class="email" name="person[can_send_email]" type="hidden" value="0" /> <input id="person_can_send_email" name="person[can_send_email]" type="checkbox" value="1" />


However the "class=email" specification is on the hidden tag. It wouldn't be terribly useful except under bizarre JS conditions because it BELONGS ON THE input type-checkbox tag.

This same error is on the top of page 91 as well in that example.

Note from the Author or Editor:
This is correct - a copy/paste botch. Please move 'class="email"' to the input element in the line below in both cases.

The url is wrong I believe:

1. From the API docs (http://api.rubyonrails.com/classes/ActionView/Helpers/FormHelper.html/).

should be:

1. From the API docs (http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html).

Need to change .com to .org and DROP the final "/".

Note from the Author or Editor:
Strange. I can see how the stray / got there, but the .com / .org switch is strange. This should be:

http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html

The find last description says the same thing as "find first" = 'will return the first matching value only'. Isn't that supposed to be the LAST matching value only? Otherwise how is this different than find first?

Note from the Author or Editor:
You're completely right. That should be:

"return the last matching value only".

Thank you!

Example 9-3 has
<% if !@student.awards.empty? > 0 %>
which didn't work until I omitted the "> 0" e.g.
<% if !@student.awards.empty? %>

Note from the Author or Editor:
This is correct - we need to strike the >0.

The text says:

Near the top of the config/routes.rb file are the lines:
map.resources :awards
map.resources :students
Delete them, and replace them with:
map.resources :students, :has_many => [ :awards ]

the generated files that rails produced say:

resources :awards
resources :students

There is no reference to a map object.

I'm using:

$ rails -v
3.0.3

$ ruby -v
ruby 1.8.7 (20011-06-30 patchlevel 352) [i686-linux]

If I replace the lines with
resources :students, :has_many => [ :awards ]

then the exception

undefined local variable or method 'map' for #<ActionDispatch::Routing::Mapper:0xb75cdffc>

goes away and the URL localhost:3000/students/1
starts working. So this seems like a typo.

For some reason localhost:3000/students/1/awards/1 still isn't working. That's probably not a problem with the text.

Note from the Author or Editor:
Sorry - this was a shift from version 2 to version 3 that got by us for this chapter at the time. Fixed now.