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get gemset list

rvm gemset list

empty gemset

rvm getmset empty [gemset_name]

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Heroku Mailer (SendGrid) configuration steps

• Go to your heroku application.

• Add SendGrid addons

• Config STMP settings to your config/environment.rb

ActionMailer::Base.smtp_settings = {

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User.where(:role => :admin).order(:username).pluck(:email)    #=> [admin1@example.com, admin2@example.com]

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In your logged_in_controller.rb

class LoggedInController < ApplicationController
  before_filter :authenticate_user!
end

In your logged_in_controller_spec.rb

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Rails Admin field configuration

rails_admin do
  list do
    field :customfield do
      def value
        bindings[:object].your_method
      end
    end
 end

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class UrlValidator < ActiveModel::EachValidator
  def validate_each(record, attribute, value)
    record.errors[attribute] << (options[:message] || "must be a valid URL") unless url_valid?(value)    
  end

  # a URL may be technically well-formed but may 
  # not actually be valid, so this checks for both.
  def url_valid?(url)
 url = URI.parse(url) rescue false

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##Capybara - Wait for ajax to complete

def wait_for_ajax
  Timeout.timeout(Capybara.default_wait_time) do
    loop do
      active = page.evaluate_script('jQuery.active')
      break if active == 0
    end
 end

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The markup

<div id="parent">
  <a id="child">Click here please</a>
</div>

Instead of binding event this way this way

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Rails Active Record Query

INNER JOIN

Category.joins(:posts)

# SELECT categories.* FROM categories INNER JOIN posts ON posts.category_id = categories.id

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##Rails Submit button I18n way

en:
  helpers:
    submit:
      create: "Make New %{name}%"
      user:
        create: "Register"
 update: "Update Profile"