ZenMilan

In Rails 3

NOTE: This post now lives (and kept up to date) on my blog: http://hakunin.com/rails3-load-paths

If you add a dir directly under app/

Do nothing. All files in this dir are eager loaded in production and lazy loaded in development by default.

If you add a dir under app/something/

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Load lib files in production (Rails 5)

If you have your code defined in classes in lib/ folder you may have problems to load that code in production.

Autoloading is disabled in the production environment by default because of thread safety.

Change config/application.rb:

    config.autoload_paths << Rails.root.join("lib")
 config.eager_load_paths &lt;&lt; Rails.root.join("lib")

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Rails Migration

http://guides.rubyonrails.org/migrations.html

Migrations methods:

• add_column
• add_index
• change_column
• change_table
• create_table
• drop_table

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Ruby on Rails Cheatsheet

Architecture

Create a new application

Install the Rails gem if you haven't done so before

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Installation

1. Install fish via Brew
2. Optionally install Oh My Fish!
3. Add fish to known shells
4. Set default shell to fish

brew install fish  
curl -L https://get.oh-my.fish | fish

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DigitalOcean Rails/Ubuntu/NGINX (16.04) Setup

1. Setup
2. Swapfile
3. NGINX
4. ElasticSearch
5. RVM
6. Rails
7. Postgres
8. Capistrano

ZenMilan

require 'active_record'
require 'arel'

# Ruby-like syntax in AR conditions using the underlying Arel layer (Rails >= 3.0).
#
# What you would usually write like this: 
#
#   User.where(["users.created_at > ? AND users.name LIKE ?", Date.yesterday, "Mary"])
#
# can now be written like this (note those parentheses required by the operators precedences):

ZenMilan

Steps for Hosting a Website on GitHub

1. Create a GitHub account on github.com.
2. Download either [GitHub for Mac][1] or [GitHub for Windows][2], depending on your operating system. Open the app and log in using the account you just created.
3. (On Mac): After you login, click advanced and make sure that your name and email are correct. Then, click "Install Command Line Tools", just in case you want to start using the command line later in life.
4. Create a new repository in your GitHub application. Name it your-username.github.io. The name is very important. Note the folder that GitHub is saving the repository to. Make sure the "Push to GitHub?" box is checked.
5. Move your website's files into the folder that GitHub just created when you made the repository. IMPORTANT: Your homepage HTML file must be called "index.html", and it must exist in the top-level directory.
6. Back in the GitHub application, you should see your files in the left column. Make sure they are all checked. If so, enter a mess

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class Person
  def name(n)
    @name = n
    self
  end
  def age(a)
    @age = a
    self
  end

ZenMilan

# Info/code for this file were borrowed from the following places:
#   http://bit.ly/174dkWL
#   https://gist.github.com/adamcrown/932231
#   https://gist.github.com/patmcnally/893833

begin

  # ansi colors
  ANSI = {}
  ANSI[:RESET]     = "\e[0m"