If the time is incorrect on something that you insert directly into the database when using Rails (off by several hours), try ensuring that you are using the correct modifier to get it into the right time zone. For example, instead of doing DateTime.now, try DateTime.now.utc if you are using UTC as your default timezone.
I looked around and there was seemingly no easy way to convert Rails apps to use Slim instead of ERB. There was a gem out there, but it didn't seem to work for me.
The general process I used was to first convert ERB to Haml using Haml's haml2html. Next, convert Haml to Slim using haml2slim.
Convert ERB to Haml
Ensure you have Haml installed, preferably using your Gemfile if using Bundler. You can probably remove Haml when you are done with this process.
The command to see what gems have more recent versions and can be updated is bundle outdated. This will show you all gems that could be upgraded, but unlike bundle update, will not actually update your gems (changing Gemfile.lock and installing new gems.)
It will output something like:
$ bundle outdated
Updating git://github.com/panozzaj/andand.git
Fetching gem metadata from http://rubygems.org/.......
Fetching gem metadata from http://rubygems.org/..
Outdated gems included in the bundle:
* ZenTest (4.6.2 > 4.5.0)
* activesupport (3.1.1 > 3.0.9)
* builder (3.0.0 > 2.1.2)
* i18n (0.6.0 > 0.5.0)
* activemodel (3.1.1 > 3.0.9)
* erubis (2.7.0 > 2.6.6)
* rack (1.3.4 > 1.2.4)
* rack-mount (0.8.3 > 0.6.14)
* rack-test (0.6.1 > 0.5.7)
* actionpack (3.1.1 > 3.0.9)
* mail (2.3.0 > 2.2.19)
* actionmailer (3.1.1 > 3.0.9)
* arel (2.2.1 > 2.0.10)
* activerecord (3.1.1 > 3.0.9)
* activeresource (3.1.1 > 3.0.9)
* devise (1.4.2 2a5ad46 > 1.4.2 e76ba05)
* railties (3.1.1 > 3.0.9)
* rails (3.1.1 > 3.0.9)
* sequel (3.28.0 > 3.20.0)
* sinatra (1.3.1 > 1.0)
To break it down, "sinatra (1.3.1 > 1.0)" means that I have version 1.0 and version 1.3.1 is available.
Last month I gave a presentation about making recommendations with Apache Mahout. Since the presentation, Manning books has released the final version of their book, Mahout in Action, which should be an even better resource than the book that I was using for my slides and presentation. Here are the slides:
(Slides no longer available.)
I was getting an error from Slim template saying:
Failure/Error: render
ActionView::Template::Error:
Unexpected end of file
my_file.html.slim, Line 15
, where the file had only 15 lines