rails4to5guide.md

Rails 5

• Performance improvements
• ActionCable websocket support
• merge request #420 by @hsluo

ruby

• Rails 5 requires Ruby 2.2.2 or newer. (2.2.4 or 2.3.0)
• reduce memory usage by taking advantage of GC
• gem update --system

ApplicationRecord && ApplicationJob

• ApplicationRecord
• ApplicationJob
• ApplicationMailer
• ApplicationController

# app/models/application_record.rb
class ApplicationRecord < ActiveRecord::Base
  self.abstract_class = true
end

# app/jobs/application_job.rb
class ApplicationJob < ActiveJob::Base
end

bin/rails

• rails db:migrate
• rails styleguide:build

Controller changes

render nothing: true

• deprecated :nothing option for render()
• head :ok
• head :not_found
• head :unauthorized
• head :internal_server_error

redirect_to :back

• RedirectBackError
• redirect_back(fallback_location: root_path)
• rails#22506
• required fallback_location argument

# app/controllers/application_controller.rb
def redirect_back(fallback_location: request.referer || root_path, **args)
  super(fallback_location: fallback_location, **args)
end

params not inherited from hash

• rails#20868
• params.to_h & params.to_unsafe_h
• DEPRECATION WARNING (deprecated in rails 5.1)

Deprecated *_filter

• skip_before_filter -> skip_before_action
• before_filter -> before_action

Test

get :show, id: funding.id, format: :json # before
get :show, params: { id: funding.id, format: :json } # now

Others

pluck with enum status

image_tag nil check

• <%= image_tag nil %> raise error
• more info

db/schema.db

• rails db:migrate
• add_index -> t.index

or() with relation

Funding.where(status: 0).or(Funding.where(role: 0)).to_sql

SELECT \"fundings\".* FROM \"fundings\" WHERE (\"fundings\".\"status\" = 0 OR \"fundings\".\"role\" = 0)

belongs_to required by default

config.active_record.belongs_to_required_by_default = false

has_secure_token

class UserPitch < ApplicationRecord
  has_secure_token :token
end

# rails g model user_pitch token:token
create_table :user_pitches do |t|
  t.string :token
  t.timestamps
end

add_index :user_pitches, :token, unique: true

up = UserPitch.create
up.token
up.regenerate_token

Turbolinks

• turbolinks-classic
• nth to do here.

Rails 5.1

Sprockets 4 (not yet)

• config/initializers/assets.rb -> app/assets/config/manifest.js
• Rails 5: The Sprockets 4 Manifest

//= link_tree ../images
//= link_directory ../javascripts .js
//= link_directory ../stylesheets .css

Links

• Rails 5.0 Release Notes
• A Guide for upgrading Rails
• Whats new in rails 5