Category Archives: Geek Stuff

Ruby’s #length vs #size vs #count Methods

Before googling for the article, I knew going in that .size is an alias to .length. But I didn’t know there was more to the story. And what about .count?

Here’s what Josh Susser wrote verbatim:

In Ruby, #length and #size are synonyms and both do the same thing: they tell you how many elements are in an array or hash. Technically #length is the method and #size is an alias to it.

In ActiveRecord, there are several ways to find out how many records are in an association, and there are some subtle differences in how they work.

* post.comments.count – Determine the number of elements with an SQL COUNT query. You can also specify conditions to count only a subset of the associated elements (e.g. :conditions => {:author_name => “josh”}). If you set up a counter cache on the association, #count will return that cached value instead of executing a new query.

* post.comments.length – This always loads the contents of the association into memory, then returns the number of elements loaded. Note that this won’t force an update if the association had been previously loaded and then new comments were created through another way (e.g. Comment.create(…) instead of post.comments.create(…)).

* post.comments.size – This works as a combination of the two previous options. If the collection has already been loaded, it will return its length just like calling #length. If it hasn’t been loaded yet, it’s like calling #count.

Speed Up Wake from Sleep Time on Mountain Lion

I bought a very beefy MacBook Air this summer. But I was frustrated with how slow the machine’s wake-from-sleep time was whenever it’s been in sleep mode for an extended period of time. For the longest time I just couldn’t figure it out. But as it turns out, it’s a new “feature” designed to make the batteries last longer.

Basically after certain number of hours, in order to save on energy, Mt. Lion saves most of the content in RAM to disk, thus making the wake up taking much much longer than desired. Here’s the blog I found with instructions to change that.

And here’s the instruction just in case. Open your Terminal via Applications > Utilities > Terminal.app, and issue the following command:

sudo pmset –a standbydelay 43200

43200 is seconds, which is 12 hours. I almost always never leave the laptop unused more than 12 hours, so I set mine to 86400, which is 24 hours. To find out what the current setting is, issue this command:

pmset -g

And there you have it!

Resources for Working with Objective-C’s Core Data

I started dabbling with building an app in Objective-C and Xcode recently. And Core Data seems to be a nice way to work with persisting data across app launches. But its learning curve is notoriously steep (Apple’s own documentation doesn’t help at all).

But Techotopia has a nice and short overview of what Core Data is and how it works in a way that’s not intimidating. But the best source for me by far is “Core Data for iOS and OS X with Simon Allardice” from Lynda.com. I’m a visual/audio learner. And the best way for me to learn is usually through a Youtube video or some clips from Lynda’s web site.

Upgrading Rails 2.x to Rails 3

I gathered a small collection of sites on how to upgrade from Rails 2.x to Rails 3 for my last job. But we never got around to using it. But instead of throwing away the bookmarks, I thought it might be a good idea to save them somewhere more “permanent”.

One method I keep hearing from others who have done it is to make sure you have decent test coverage for your app. And then upgrade one baby steps at a time: First upgrade to the next immediate major version of Rails, and then the one after that… etc. For example, Rails 2.3.x => 3.0, and then 3.0 => 3.1, and then 3.1 => 3.2… etc. And along the way, fix your code and make sure all the tests pass.

Happy coding.

Moving A Folder from One Git Repo to Another While Keeping History

Moving stuff from one git repo to another while keeping the history intact is a cool way to break stuff out of old repos and migrate them around. Here’s how to do it:

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git clone --no-hardlinks /path/to/sourcerepository directory-to-move
cd directory-to-move

# remove remote origin just so we can't break anything in the source repository
git remote rm origin

# filter for desired files
git filter-branch --subdirectory-filter new-directory-name HEAD

# move around files, etc.
# then commit
git add .
git commit -m "isolated files"

Refernece: Moving files from a Git repository to another keeping history

Lives of .bashrc, .bash_profile, .profile, and Beyond

Before reading this article on the differences, I’d been stuffing all my export, alias and other things in either .bash_profile or .profile files on my Macs.

Though most settings will run just fine in either file, there is an important difference between .bash_profile and .profile:

If you need something to be executed or sourced (i.e. source ~/.profile) as you open a new terminal tab or terminal window, stick it inside of .bash_profile. Items in .profile only get run once when you login.

Postgresql Install Errors on OSX

Update 12/28/2012: There’s an easier way to run PostgreSQL! Mattt Thompson has written Postgres app for Mac OSX that allows the database to run completely self-contained! Hassle-free!

Last week I was trying out Sinatra and Padrino with PostgreSQL. But for the life of me, I couldn’t get PosstgreSQL to run. At first I thought it was an issue with using MacPorts again. But after some googling, it seems like others who used Homebrew also had similar issues.

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could not connect to database postgres: could not connect to server: Permission denied
    Is the server running locally and accepting
    connections on Unix domain socket "/var/pgsql_socket/.s.PGSQL.5432"?

There are a couple of ways to deal with this. One of them is to include the PostgreSQL path on OSX’s commandline lookup chain. In your .bash_profile (or .profile for others) file, you could add the path to the PostgreSQL binaries:

export PATH=/opt/local/bin:/opt/local/sbin:/usr/local/mysql/bin:/opt/local/lib/postgresql91/bin:$PATH

Make sure the version number on PostgreSQL matches the version you are running.

References

  • http://damosworld.wordpress.com/2011/04/09/installation-of-postgresql-on-macos-x-using-macports/
  • http://bsnyderblog.blogspot.com/2011/09/installing-postgresql-90-on-mac-os-x.html
  • http://od-eon.com/blogs/calvin/os-x-lion-postgresql/

Segmentation Fault with Rails 3.2.6 on OSX

I was trying to create a new project with Rails 3.2.x. But every time as it runs bundle install, I get the following error:

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/Users/home_dir/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/net/http.rb:799: [BUG] Segmentation fault
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin11.4.0]
.
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other crap

I tried gem uninstall and reinstalling Rails to no avail. It turns out that Ruby needs to find openssl but couldn’t find it at its preferred location. MacPorts handled all my 3rd party binary needs. But in this case, I wanted to use RVM to handle those packages for dependency reasons.

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rvm pkg install iconv
rvm pkg install openssl
rvm reinstall 1.9.3 --with-openssl-dir=~/.rvm/usr --with-iconv-dir=~/.rvm/usr

And that solved the issue for me.

Update 02/22/2013: The lastest version of rvm 1.18.10 apparently will do all kinds of nice things in the background for you to solve the issue as well.

References:

Ruby on Rails Install with “Bad Interpreter” Errors

Today I decided to finally upgrade my Ruby on Rails setup at home. But upon running the rails -v command, I ran into this error:

bash: /opt/local/bin/rails: /opt/local/bin/ruby: bad interpreter: No such file or directory

Turns out for some reason there’s another (non-working) copy of rails in my /opt/local/bin/ directory. To fix the problem, I simply had to remove it (along with rake and other related executables out of there).

On a related note, I also tried upgrading rvm. But while trying to upgrade Ruby to the latest 1.9.3 with it using the rvm install 1.9.3, I kept getting this error:

curl: (7) couldn't connect to host

Finally, what worked was this:

curl -L get.rvm.io | bash -s stable --ruby

And to bind that to rails, similarly, do this:

curl -L get.rvm.io | bash -s stable --rails

That’s it. Happy hacking.

References:

  • https://rvm.io/rvm/install/
  • https://github.com/wayneeseguin/rvm