This is the error I got:

No association found for name `products’. Has it been defined yet?

I had changed the Product_Lines model to has_one Product.  But, I had over looked the accepts_nested_attributes_for line.  I changed :products to :product and it fixed it.

Edit the  sudoers file


This step must be carried out as the admin user of your  accelerator (or another user allowed to call sudo visudo) otherwise you  won't be allowed to run the command. To add a user to sudoers file, you  must use visudo. visudo emulates VI and is used to prevent errors when  editing the sudoers file:
sudo visudo

If you can't use the arrows, as  reported by some people on OS X, you can use other keys (h, j, k, l; learn more here: http://hea-www.harvard.edu/~fine/Tech/vi.html),  or use an alternate terminal like iTerm, which has been reported to  work.

How to use visudo

1. Use the arrow keys to navigate the cursor to the spot where you want  to start typing

2. Enter “insert mode” by pressing “i”

3. When you are done entering text, hit esc to go back to “command mode”

4. Write the file back to disk by typing :w followed by hitting enter.

5. Exit visudo with :q followed by enter.

Text entered for my user, right below “root ALL=(ALL) ALL”:

newuserforvirtualserver ALL=(ALL) ALL

Also, I had errors where I had to modify the permissions — getting a permissions denied.

** [myserver :: out] fatal: could not create work tree dir ‘var/www/myapp/shared/cached-copy’: Permission denied.

The solution was to change the permissions on www to 765.

Preferences > VCSs > Git

Path to git executable: /usr/local/git/bin/git   (for OSx)

3 errors prohibited this page[contact attributes] from being  saved

Not very user friendly.   So, I hit Google, blogs and IRC.  So, here the solution I discovered.

<%= error_messages_for ‘c’, :header_message => “Please correct the errors below:”%>

Since this was part of a fields_for block,  I had to add this to my controller method:

@c = @section.contact

There is a somewhat simple solution, but it requires a working server.

http://support.microsoft.com/kb/906510

In the /etc/apache2 directory you have two directories:
- sites-available
- sites-enabled

The sites-available directory contains configuration files for each website.
The sites-available contains links to the configuration file in the sites-available directory.  It does not contain the file itself.

The mistake that is made at times is that *all* configs are placed in one file – default.

So, for a domain name like domain.com you would create a file called domain.com in the sites-available directory with the following:

NameVirtualHost *:80
<VirtualHost *:80>
DocumentRoot /var/www/domain
ServerName www.domain.com
Server Alias domain.com
</VirtualHost>

you would do:  /ln -s /etc/apache2/sites-available/domain.com /etc/apache2/sites-enabled/domain.com

OR

a2ensite domain.com (from within the sites-available) directory.

finally:  /etc/init.d/apache2 reload

So, in a nutshell — create a file per domain name — use ServerAlias to cover www.domain.com and domain.com.

I thought it would be best to share what I think would be the best way to approach learning Ruby on Rails based on all of my experiences.  So, here are my suggestions

1. Learn Ruby on Rails on Linux or a Mac.

Why?  It’s just easier.  An example to this is getting the MySQL gem installed on Windows – after hours of trying to figure this out, I finally gave up and started to use Linux.  You will spend hours trying to get something to work under Windows and to me that is just wasted time.  And I tried all different kinds of approaches – Cygwin, Instant Rails, etc.

2. Learn Ruby

Here are some suggestion:

Programming Ruby 1.9: The Pragmatic Programmers’ Guide (Facets of Ruby)

Free (if you buy a book) class.

Also, most Ruby on Rails books will give you a sufficient overview to the Ruby language to get started.

3. Expect gaps of informaton

This was a *huge* problem for me.  I started working my way through the Agile Web Development with Rails book, that presents itself as a book  from a beginner to an expert.  Well, I discovered that the book *expects* you know the nuances of Rails.

I’ve looked at a good number of books and found this one to be a great one to start with:

Ruby on Rails Bible

Note:  While the book was published in 2008, it covers Rails 1.2 – which was current in 2005.  So the book is a *bit* dated.  However, it does present itself with knowledge about Rails that other books leave out.  Also, as a co-worker pointed out, the web site for the book is – uh, well – broken.

So, specifically, as most Railists know – RoR is convention over configuration – and what I find missing in most books is a good explanation of the conventions.

4. Watch some screen casts:

Free

Railcasts

TeachMeToCode.com ** check out the Flitter tutorial

Paid

PeepCode ** $149 a year – has tutorials on Ruby, Rails, and much more!

Well, that’s my advice.  Let me know if you have any suggestions!

sudo gem install -r libxml-ruby

Gives you this:

ERROR:  Error installing libxml-ruby:
ERROR: Failed to build gem native extension.

/usr/bin/ruby1.8 extconf.rb
checking for socket() in -lsocket… no
checking for gethostbyname() in -lnsl… yes
checking for atan() in -lm… no
checking for atan() in -lm… yes
checking for inflate() in -lz… yes
checking for iconv_open() in -liconv… no
checking for libiconv_open() in -liconv… no
checking for libiconv_open() in -llibiconv… no
checking for iconv_open() in -llibiconv… no
checking for iconv_open() in -lc… yes
checking for xmlParseDoc() in -lxml2… no
checking for xmlParseDoc() in -llibxml2… no
checking for xmlParseDoc() in -lxml2… no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
–with-opt-dir
–without-opt-dir
–with-opt-include
–without-opt-include=${opt-dir}/include
–with-opt-lib
–without-opt-lib=${opt-dir}/lib
–with-make-prog
–without-make-prog
–srcdir=.
–curdir
–ruby=/usr/bin/ruby1.8
–with-iconv-dir
–without-iconv-dir
–with-iconv-include
–without-iconv-include=${iconv-dir}/include
–with-iconv-lib
–without-iconv-lib=${iconv-dir}/lib
–with-zlib-dir
–without-zlib-dir
–with-zlib-include
–without-zlib-include=${zlib-dir}/include
–with-zlib-lib
–without-zlib-lib=${zlib-dir}/lib
–with-socketlib
–without-socketlib
–with-nsllib
–without-nsllib
–with-mlib
–without-mlib
–with-mlib
–without-mlib
–with-zlib
–without-zlib
–with-iconvlib
–without-iconvlib
–with-iconvlib
–without-iconvlib
–with-libiconvlib
–without-libiconvlib
–with-libiconvlib
–without-libiconvlib
–with-clib
–without-clib
–with-xml2-config
–without-xml2-config
–with-xml2-dir
–without-xml2-dir
–with-xml2-include
–without-xml2-include=${xml2-dir}/include
–with-xml2-lib
–without-xml2-lib=${xml2-dir}/lib
–with-xml2lib
–without-xml2lib
–with-libxml2lib
–without-libxml2lib
–with-xml2lib
–without-xml2lib
extconf failure: need libxml2.

Install the library or try one of the following options to extconf.rb:

–with-xml2-config=/path/to/xml2-config
–with-xml2-dir=/path/to/libxml2
–with-xml2-lib=/path/to/libxml2/lib
–with-xml2-include=/path/to/libxml2/include

So, do this:

sudo apt-get install libxml2-dev

And this again:

sudo gem install -r libxml-ruby

So, I came across this product – LimeChat.  At least it gets me to the point where I can ask what everyone recommends.

I’ll post more info later, if I decide to switch to another product or let you know how this one is working out.