TIL

You can make Ruby regex matchers case insensitive with an i. 2.1.0 :001 > 'Expected output' =~ /expected/ => nil 2.1.0 :002 > 'Expected output' =~ /expected/i => 0 This is useful when writing tests, when you care about a message, but are not interested in its exact format.

Check the value of any Vim setting by adding a ? to the end of its name. # Validate spelling is turned off :set spell? => nospell # Validate incremental search is turned on :set incsearch? => :incsearch

With Vim you can jump down any n amount of lines with n + j, and back up with n + k. An alternate command is n + +, which jumps down to the first non-blank character, and n + -, which jumps back up to the first non-blank character.

To redirect a path in Rails: # config/routes.rb get "/authors" => redirect("/designers") This lets you take a difficult-to-type path name and expose it to your users as a simpler path name: # config/routes.rb get "/login" => redirect("/auth/google_oauth2")

Rails comes with HTTP Basic authentication built in. Adding this to a controller is how it’s done: # app/controllers/application_controller.rb http_basic_authenticate_with name: 'name', password: 'password' When you visit a URL requiring authentication, you can bypass the authentication screen by adding your username and password to the beginning of the URL. For localhost, this would look like: name:password@localhost:3000

To save a snapshot of your current work in git, try this command: git stash save "snapshot: $(date)" && git stash apply "stash@{0}" This saves your current work in a timestamped stash, without removing it. In Hashrocket’s dotmatrix this command is aliased to git snapshot.

In Vim there are many ways to close a file. One of the best is :x, also know as :xit. :x writes and quits a file when changes have been made, like :wq, but with one less keystroke. An important distinction: :x and :wq are similar, but not identical commands. The difference is that :wq writes the current file and quits, as long as the file is not read-only and has a name, while :x only writes if changes have been made. So, if you were to generate a file with Vim, make no changes, and try to write and quit with :x, the file would not be written. Doing the same thing with :wq would write the file.

One way to make a list nicer to read is to sort it. Vim comes with a command built in for just this purpose. Here is a snippet from a Gemfile: gem 'coffee-rails', '~> 4.1.0' gem 'uglifier', '>= 1.3.0' gem 'sass-rails', '~> 5.0' gem 'puma' gem 'gravatar_image_tag' gem 'authem' gem 'jquery-rails' gem 'pg' gem 'redcarpet' gem 'rails_12factor', group: :production gem 'sdoc', '~> 0.4.0', group: :doc These gems might have been added during the development process. To sort them, enter visual mode, highlight the desired range, and enter :sort. Here’s the result: ...

Rails logs your server’s activity, which is useful for development and debugging. However, often the server handles sensitive information that should not be logged. A few examples are authentication credentials, personal data, and financial information. To prevent Rails from logging such data, add this to your application configuration: config.filter_parameters << :sensitive_param When the named parameter is handled by the server, it will be logged as [FILTERED] instead of its actual value. Add this configuration by environment if you want to keep the parameters unfiltered in development.

In this example, we want to allow users to enter a twitter handle with or without an at-sign (’@’), just like Twitter, but save it without the at-sign. twitter_handle is already an attribute on the class. class User < ActiveRecord::Base def twitter_handle=(handle) write_attribute(:twitter_handle, handle.to_s.gsub(/^@/, '')) end end