longlostnick

# (v.respond_to?(:empty?) ? v.empty? : !v) is basically rails' .blank? in plain ruby
class Hash
  def delete_blank
    delete_if do |k, v|
      (v.respond_to?(:empty?) ? v.empty? : !v) or v.instance_of?(Hash) && v.delete_blank.empty?
    end
  end
end

thijsc

def select_from_chosen(item_text, options)
  field = find_field(options[:from])
  option_value = page.evaluate_script("$(\"##{field[:id]} option:contains('#{item_text}')\").val()")
  page.execute_script("$('##{field[:id]}').val('#{option_value}')")
end

dsandstrom

# .rubocop.yml

# rubocop config files for Ruby 3.0 / Rails 6+ project

AllCops:
  TargetRubyVersion: 3.0
  NewCops: enable
  SuggestExtensions: false

  Include:

maxivak

Generate sitemap.xml in Rails app

This post shows how to make sitemap.xml for your web site. The sitemap will be accessible by URL http://mysite.com/sitemap.xml

Routes

Myrails::Application.routes.draw do

mieko

This is an example of how to configure nginx to allow ActionCable WebSocket connections to use the same host as your primary site. For example, instead of cable.myapp.dev, you can use myapp.dev/_c/.

In my case, we have a multi-tenanted environment, e.g., bob.myapp.dev and jim.myapp.dev. This lets the ActionCable connection still use the Host: header to select a tenant, and use normal cookies for user identification. wss://bob.myapp.dev/_c/ is authorized as normal. It also piggybacks off of whatever TLS setup is available.

ThawanFidelis

# config/enviroments/development.rb
config.action_mailer.preview_path = "#{Rails.root}/app/mailer_previews"


# app/mailer_previews/devise_mailer_preview.rb
class Devise::MailerPreview < ActionMailer::Preview
  def confirmation_instructions
    Devise::Mailer.confirmation_instructions(User.first, {})
  end

joepie91

Read this first!

Hi there! Since this post was originally written, nvm has gained some new tools, and some people have suggested alternative (and potentially better) approaches for modern systems. Make sure to have a look at the comments to this article, before following this guide!

---

The original article

Trickier than it seems.

wrburgess

class InitialMigration < ActiveRecord::Migration[5.0]
  def change
    enable_extension "pgcrypto" unless extension_enabled?("pgcrypto")
  end
end

randallreedjr

Working with git remotes on Heroku

Generally, you will add a git remote for your Heroku app during the Heroku app creation process, i.e. heroku create. However, if you are working on an existing app and want to add git remotes to enable manual deploys, the following commands may be useful.

Adding a new remote

Add a remote for your Staging app and deploy

Note that on Heroku, you must always use master as the destination branch on the remote. If you want to deploy a different branch, you can use the syntax local_branch:destination_branch seen below (in this example, we push the local staging branch to the master branch on heroku.

$ git remote add staging https://git.heroku.com/staging-app.git

zulhfreelancer

If you get error like this:

Running via Spring preloader in process 7662
/Users/zulh/.rvm/gems/ruby-2.3.1@useradmin/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:274:in `require': dlopen(/Users/zulh/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/x86_64-darwin15/readline.bundle, 9): Library not loaded: /usr/local/opt/readline/lib/libreadline.6.dylib (LoadError)
  Referenced from: /Users/zulh/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/x86_64-darwin15/readline.bundle
  Reason: image not found - /Users/zulh/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/x86_64-darwin15/readline.bundle
	from /Users/zulh/.rvm/gems/ruby-2.3.1@useradmin/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:274:in `block in require'
	from /Users/zulh/.rvm/gems/ruby-2.3.1@useradmin/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:240:in `load_dependency'
	from /Users/zulh/.rvm/gems/ruby-2.3.1@useradmin/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:274:in `require'