Bahanix

# Everything after the '#' character is a comment
# Run these lines in an interactive ruby interpreter (irb) to "feel" them

# Maths

9/2 == 4
9/2.0 == 4.5 # Same as 9.0/2 or 9.0/2.0 or 9.to_f/2

2**8 == 256

Bahanix

#!/bin/sh

STASH_NAME="$(git stash list | grep `git branch | grep \* | cut -d ' ' -f2` | head -n1 | cut -d':' -f1)"
if [ -n "$STASH_NAME" ]
then
  echo "Last stash on this branch:"
  git --no-pager stash show "$STASH_NAME" -p
  echo "To keep your stash list clean, consider using one of the followings:"
  echo "git stash pop \"$STASH_NAME\""
  echo "git stash drop \"$STASH_NAME\""

Bahanix

# Simple :
# params[:user][:tags] = ["tag1", "tag2"]
user.update!(user_params)

# Ou encore :
user.tags = ["tag1", "tag2"]
user.save!

# Beau
def user_params

Bahanix

add_column :users, :tags, :string, array: true, default: []

Bahanix

add_column :users, :tags, :string, array: true, null: false, default: []
add_index :users, :tags, using: :gin

# Ceci ne fonctionnera pas :
User.where("users.tags @> ?", requested_tags)

# Faites ceci, même si requested_tags n'a qu'un item ou n'est pas un array.
User.where("users.tags @> ARRAY[?]", requested_tags)

# Si vous rencontrez cette erreur, faites ceci :

Bahanix

# app/models/concerns/sortable.rb
module Sortable
  extend ActiveSupport::Concern

  included do
    # Model.smart_sort("attribute_a,+attribute_b,-attribute_c")
    # is equivalent to
    # Model.order(attribute_a).order(attribute_b: :asc).order(attribute_c: :desc)
    scope :smart_sort, -> (sort) {
      scope = self.all

Bahanix

class User < ActiveRecord::Base
  # Only this class changed
  has_many :posts, compose: :published
end

class Post < ActiveRecord::Base
  belongs_to :user
  scope :published, -> { where(status: :published) }
end

Bahanix

class User < ActiveRecord::Base
  has_many :posts
  has_many :published_posts, -> { published }, class_name: "Post"
end

class Post < ActiveRecord::Base
  belongs_to :user
  scope :published, -> { where(status: :published) }
end

Bahanix

class User < ActiveRecord::Base
  has_many :posts
end

class Post < ActiveRecord::Base
  belongs_to :user
end

# It will hit 11 times your database, that's bad!
User.limit(10).each do |user|

Bahanix

# app/controllers/application_controller.rb
class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception
  before_action :set_locale

  private

  def set_locale
    if session[:locale]
      I18n.locale = session[:locale]