I was working on a gem a couple months ago, and it came time for my boss to do a code review before we install the gem on another teams system. My boss pointed out that there were areas where I was returning FALSE, and baking in a lot of conditional statements and other handling, instead of using Ruby’s built in feature of error handling, which is designed to bubble exceptions up the call stack. He informed me that in situation that are not expected to occur, it’s best to raise an exception to halt execution and report the issue. He even recommended that I read Exceptional Ruby, a book devoted to the subject of proper exception handling.
I remember when I was first exposed to the concept of test driven development (TDD), it seemed like you were writing a test that did the same thing as the function itself. This really left me perplexed as to why everyone was raving about it’s value.
Take for instance the following method:
class SomeClass def self.todays_date Time.now.strftime("%Y-%m-%d") end end
Here are some tips that will help you with Controller tests in Rspec.
Common Response Methods
# Get HTTP response code with message. Example: "302 Found" response.status # Get HTTP response code. Example: 200 response.response_code # Get response body response.body # Get location header, used with redirects response.location
I’m working on a project that is stuck on Rails 2.3.8 due to the size and complexity of the codebase. Upgrading it would be a nightmare. I recently ran into an issue with the database_cleaner gem, which isn’t rolling back transactional queries properly. I’m not sure if the issue is with the gem, or perhaps some configuration with the system (ActiveRecord) which is causing the issue. Because of this, I’m wanting to create a dummy Rails 2.3.8 application so that I can reproduce the issue on a fresh, simple, vanilla Rails application.
I created a new ‘rails238’ directory and switched to it, then created a new gemset via RVM.
I’m working on an older Rails 2.3.8 application that is way too complicated and without tests to make it worth upgrading to Rails 3 or higher. Because of this we must use RSpec-Rails 1.3.4, with RSpec 1.3.2.
I was just trying to run a single test from the command line like so:
$ bundle exec rspec spec/models/post.rb bundler: command not found: rspec Install missing gem executables with `bundle install`
Certain command line utilities drop into an external text editor program to accept certain types of input. For instance, when using the command ‘crontab -e’ to edit your cron table, your default text editor program will be opened up with the current cron table configuration. The same also applies to the Git versioning system when using the interactive rebase mode. This helps the program avoid supporting it’s own text editor, and allows the user to specify their preferred text editor.
To specify the default text editor, simply edit or place the following definition inside of the .bash_profile file in your home directory. This example uses ‘/usr/local/bin/mate -w’ to specify that the Textmate editor be used. You may configure this value to reflect the path for Vim, Nano, or any other text editor you wish to use.
I ran into an instance of meta programming in Ruby today, in the Exceptional Ruby book I’m reading for work. It seems that the theme this week is “you don’t know Ruby as well as you could”.
I might be wrong in my understanding here, but this is what I understand thus far:
Ruby stores methods for an object in it’s class, not the object itself. Objects only really store their attributes/variables in memory. However there exists some unseen entity known as the metaclass which belongs to each object, and it can possibly store methods which belong to that object, but not necessarily to that objects class.
One of the awesome things about Ruby is that you can over-ride methods you define, or even over-write methods that are built into Ruby.
This may not be unique with Ruby, but you can also over-ride super class methods in your defined subclass and use ‘super’ to execute the logic defined in the super class version of that method.
I’m sorry Taryn. My friend just pointed your site out to me. I swear it was a coincidence. I like your background by the way.