Ruby on Rails - upgrading from rails 4.2 to Rails 5.0 - ruby on rails tutorial - rails guides - rails tutorial - ruby rails

Rails 4.2 to Rails 5.0 upgrade,we must be using Ruby 2.2.2 or newer.
After upgrading our Ruby version if required, go to our Gemfile and change the line:

gem 'rails', '4.2.X'

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to:

gem 'rails', '~> 5.0.0'

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Run the command line:

$ bundle update

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This will help us to update configuration files.

We will be prompted to overwrite files and we have several options to input:

Y – yes, overwrite
n – no, do not overwrite
a – all, overwrite this and all others
q – quit, abort
d – diff, show the differences between the old and the new
h – help

Typically,we should check the differences between the old and new files to make sure we aren't getting any unwanted changes.

Rails 5.0 ActiveRecord models inherit from ApplicationRecord, rather than ActiveRecord::Base.
ApplicationRecord is the superclass for all models, similar to how ApplicationController is the superclass for controllers.
To account for this new way in which models are handled, we must create a file in our app/models/ folder called application_record.rb and then edit that file's contents to be:

class ApplicationRecord < ActiveRecord::Base
  self.abstract_class = true
end

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Rails 5.0 also handles callbacks slightly different. Callbacks that return false won't halt the callback chain, which means subsequent callbacks will still run, unlike Rails 4.2. When we upgrade, the Rails 4.2 behavior will remain, though we can switch to the Rails 5.0 behavior by adding:

ActiveSupport.halt_callback_chains_on_return_false = false

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The config/application.rb file. we can explicitly halt the callback chain by calling throw(:abort).

Rails 5.0, ActiveJob will inherit from ApplicationJob, rather than ActiveJob::Base like in Rails 4.2. To upgrade to Rails 5.0, create a file called application_job.rb in the app/jobs/ folder.

Edit that file's contents to be:

class ApplicationJob < ActiveJob::Base
end

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We must change all of our jobs to inherit from ApplicationJob rather than ActiveJob::Base.

One of the other biggest changes of Rails 5.0 doesn't require any code changes, but will change the way we use the command line with our Rails apps.
We will be able to use bin/rails, or just rails, to run tasks and tests.

Example

Instead of using $ rake db:migrate ,we can now do $ rails db:migrate.
If we run $ bin/rails, we can view all the available commands.
Note: that many of the tasks that can now be run with bin/rails still work using rake.

Ruby On Rails Basics

Ruby On Rails Routing

ActiveRecord Migrations

Best Practices

ActivRecord Validations

ActiveRecord Associations

ActiveRecord Query Interface

Naming Conventions

User Authentication

Ruby on Rails Views

ActiveRecord

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