About Jason Noble

  • Website: http://jasonnoble.org
  • Email: email
  • Biography: Jason Noble is a Linux systems engineer with over 10 years experience configuring Linux, Apache, MySQL, Perl, Ruby and Ruby on Rails technologies.

Posts by Jason Noble:


Parameter Lists Rubocop

Posted by Jason Noble on 02/19/2015 in rubocop, ruby, Uncategorized |

RuboCop Logo

Rubocop is a Ruby static code analyzer. Rubocop utilizes a number of style rules, which it calls “Cops”, hence the name.

I picked a cop at random, and wanted to see what it looks for in my Ruby code. So let’s take a look at Parameter Lists

cd ~/workspace/davinci_coders_t1_2015/practice
mkdir parameter_list_rubocop
cd parameter_list_rubocop
echo ‘2.1.5’ > .ruby-version
echo ‘davinci_coders’ > .ruby-gemset
cd .

Here I’m going into my practice directory and making a new one. I then setup the directory to have RVM load Ruby 2.1.5 and the davinci_coders gemset. Next I need to add the guard-rubocop gem.

# Gemfile
source ‘https://rubygems.org’

gem ‘guard-rubocop’

Next we need to bundle in order to install these gems. Then we’ll initialize guard.

guard init

Now we need to tell Guard to ignore the Guardfile.

# .rubocop.yml
– ‘Guardfile’

We’ll fire up Guard, and we get no offenses. Let’s add a Ruby file called program_1.rb.

#!/usr/bin/env ruby

# I’m looking at https://github.com/bbatsov/rubocop/blob/master/lib/rubocop/cop/metrics/parameter_lists.rb

def foo(param1)
puts param1

def foo2(param1, param2)
puts param1, param2

def foo3(param1, param2, param3)
puts param1, param2, param3

def foo4(param1, param2, param3, param4)
puts param1, param2, param3, param4

def foo5(param1, param2, param3, param4, param5)
puts param1, param2, param3, param4, param5

def foo6(param1, param2, param3, param4, param5, param6)
puts param1, param2, param3, param4, param5, param6

def foo7(param1, param2, param3, param4, param5, param6, param7)
puts param1, param2, param3, param4, param5, param6, param7

def foo8(param1, param2, param3, param4, param5, param6, param7, param8)
puts param1, param2, param3, param4, param5, param6, param7, param8

Now our guard gives us three offenses:

Rubocop Parameter Offenses

So it looks like Rubocop will complain if your method has more than 5 parameters. Looks like this preference comes from the Ruby Style Guide.

I’ll have to remember to have 4 or less parameters for any methods I create in the future.

Although, I could configure Rubocop to allow me up to 7 parameters:

# .rubocop.yml
Max: 7

No, that’s probably a bad idea. Nevermind.


Rebasing one branch onto another

Posted by Jason Noble on 07/29/2014 in git, github, rebase |

Ok, I’m tired of looking this up, so I’m going to document it here for future me. We have a branching strategy: maint-2014.04.04 maint-2014.04.18 … master When I create a new branch based off master, I name it 1234567890_some_short_summary_master. Later I determine it should have been based off maint-2014.04.04. Here’s the process: [code] git checkout […]

Changing Font Size in RubyMine via the Keyboard

Posted by Jason Noble on 07/17/2014 in Uncategorized |

A co-worker asked if RubyMine has the ability to increase/decrease the font size (say if you were presenting on a projector). I didn’t know, but I researched it and here’s how you enable font size changes. First open RubyMine. Go to RubyMine -> Preferences. Select Keymap from the list on the left In the upper […]

Podcasts I listen to…

Posted by Jason Noble on 06/15/2014 in Uncategorized |

Recently, one of my students Raj Solanki blogged about some podcasts that he recently found. For the past month or so, I’ve been listening to several podcasts. I listen on my iPod, but I’ve found the built in Podcasts app frankly sucks. A co-worker introduced me to Downcast, which is an alternative which ROCKS. My […]

Fixing inital Rubocop errors on Rails app

Posted by Jason Noble on 03/25/2014 in Uncategorized |

tl;dr: Solution I’m an Ruby on Rails instructor for the DaVinci Coders program in Louisville, CO. I teach a class called Building the Toolbelt of a Junior Ruby on Rails Developer, where we teach students how to use Ruby on Rails, as well as the other tools software engineers use in their daily work. Recently, […]


Solution: Gem::RemoteFetcher::FetchError: SSL_connect issues

Posted by Jason Noble on 10/08/2013 in Uncategorized |

One of my previous students, Ross Kinney recently blogged about an error he encountered: [code] Gem::RemoteFetcher::FetchError: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed (https://s3.amazonaws.com/production.s3.rubygems.org/gems/multi_json-1.7.7.gem) [/code] It turns out that some of the OS X SSL Certs were out of date and he fixed it by running: [code] rvm osx-ssl-certs update all […]


Updating requested_by for a bunch of Pivotal Tracker stories

Posted by Jason Noble on 07/18/2013 in Pivotal Tracker, ruby |

I recently imported a bunch of stories into Pivotal Tracker via the Import CSV function. This worked like a charm, the problem was I wanted all the stories to be requested by a different user than what was in the CSV file. I could use the web browser to do this, but that would take […]

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Mysql 5.6.12 and mysql2 ruby gem 0.3.12

Posted by Jason Noble on 07/16/2013 in mysql, ruby |

I recently updated my Homebrew install and installed the latest mysql (brew update && brew upgrade mysql) to 5.6.12. However, when I tried to upgrade my mysql2 gem from 0.3.11 to 0.3.12, I was getting the following error: [shell] *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary […]

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Github unable to reopen a closed pull request

Posted by Jason Noble on 09/11/2012 in Uncategorized |

Ran into an interesting issue at work today. My pair (Dave) and I opened a pull request yesterday and I checked the status this morning. It showed that Dave had closed it this morning. I asked him if he had intended to merge it, and he said he hadn’t closed it. The weird thing was […]

How do I turn off logging in Rails 3?

Posted by Jason Noble on 05/22/2012 in Uncategorized |

I have a script I want to run in rails console, but I don’t want to log the SQL and such. So I googled how to turn off all logging in Rails 3 console. Unfortunately, all the answers were old, so here’s how I did it: [ruby] Logging.logger.root.level = ‘off’ [/ruby]

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