The learn-enough-rails from costineest

rvm get stable

rvm install 3.1.2

rvm --default use 3.1.2

echo "gem: --no-document" >> .gemrc

gem install rails -v 7.0.3

gem install bundler -v 2.3.15

source <(curl -sL https://cdn.learnenough.com/resize)

rails _7.0.3_ new hello_app --skip-bundle

As of Rails 6 and continuing in Rails 7, running rails new automatically initializes a Git repository:

rm -r hello_app/.git

This would install the latest version of the capybara gem (which is used in testing) as long as it’s greater than or equal to version 3.26—even if it’s, say, version 7.2.

gem "capybara", ">= 3.26"

This installs the gem sqlite3 as long as it’s version 1.4 or newer (a “minor update”) but not 2 or newer (a “major update”). In other words, the >= notation always installs the latest gem as long as it meets the minimum version requirement, whereas the ~> 1.4 notation will install 1.5 (if available) but not 2.0.

gem "sqlite3", "~> 1.4"

https://github.com/learnenough/rails_tutorial_7th_edition_gemfiles

cd hello_app/ && bundle install

bin/rails server

To view the result of rails server on a native OS, paste the URL http://localhost:3000 into the address bar of your browser. On the cloud IDE, go to Preview and click on Preview Running Application and then open it in a full browser window or tab (https://cf7e24b3df894167a884d128c4695a65.vfs.cloud9.eu-south-1.amazonaws.com).
Look for all controllers available

ls app/controllers/*_controller.rb

Example of how to define the route root:

root "controller_name#action_name"

Update Git on Cloud9:

source <(curl -sL https://cdn.learnenough.com/upgrade_git)

git config --global --list

credential.helper=!aws codecommit credential-helper $@
credential.usehttppath=true
core.editor=nano

Configure the name and email fields for Git:

$ git config --global user.name "Your Name"
$ git config --global user.email [email protected]

Define the default branch's name:

git config --global init.defaultBranch main

Set up git co as a checkout alias:

git config --global alias.co checkout

Configure Git to remember passwords for a set length of time:

git config --global credential.helper "cache --timeout=86400"

Prevent the local installation of any production gems (which in this case consists of the pg gem):

bundle config

Bundling without production gems:

bundle _2.3.14_ config set --local without 'production'

bundle _2.3.14_ install

bundle _2.3.14_ lock --add-platform x86_64-linux

See if your system already has the Heroku command-line client installed:

heroku --version

Install Heroku on the cloud IDE:

source <(curl -sL https://cdn.learnenough.com/heroku_install)

https://devcenter.heroku.com/articles/heroku-cli#install-the-heroku-cli
On a native system:

heroku login

On the cloud IDE:

heroku login --interactive

Email: <your email>
Password: <your API Key, NOT your Heroku password>

Create and configure a new application at Heroku:

heroku create

Push the main branch up to Heroku:

git push heroku main

If something goes wrong, inspect the logs:

heroku logs

Get info about the Heroku app, including the Web URL:

heroku apps:info

https://young-badlands-92881.herokuapp.com
https://www.learnenough.com/custom-domains
Generate a random subdomain with Ruby:

('a'..'z').to_a.shuffle[0..7].join

Rename the application

heroku rename learn-enough-rails_hello-app

rails new toy_app --skip-bundle

cd toy_app

bundle config set --local without 'production'

bundle install

https://marketplace.visualstudio.com/items?itemName=EditorConfig.EditorConfig + https://stackoverflow.com/a/54696441/1904223 + https://youtu.be/_fcQDS1iTPw

toy_app/bin/rails s

git commit -am "Add hello"

heroku create

git push && git push heroku main

heroku rename learn-enough-rails-toy-app

https://learn-enough-rails-toy-app.herokuapp.com + https://dashboard.heroku.com/apps/learn-enough-rails-toy-app

rails generate scaffold User name:string email:string

rails db:migrate

heroku run rails db:migrate

The correspondence between pages and URLs for the Users resource:

URL	Action	Purpose
`/users`	index	page to list all users
`/users/1`	show	page to show user with id 1
`/users/new`	new	page to make a new user
`/users/1/edit`	edit	page to edit user with id 1

RESTful routes provided by the Users resource:

HTTP request method	URL	Action	Purpose
GET	`/users`	index	page to list all users
GET	`/users/1`	show	page to show user with id 1
GET	`/users/new`	new	page to make a new user
POST	`/users`	create	create a new user
GET	`/users/1/edit`	edit	page to edit user with id 1
PATCH	`/users/1`	update	update user with id 1
DELETE	`/users/1`	delete	delete user with id 1

rails generate scaffold Micropost content:text user_id:integer

rails db:migrate

Undo a single migration step:

rails db:rollback

Go all the way back to the beginning:

rails db:migrate VERSION=0

Try to insert a text longer than 140 characters into the Content textarea at http://127.0.0.1:3000/microposts/new then submit the form.

cd toy_app && rails console

User.first

User.create!(name: 'Cos', email: '[email protected]')

micropost = User.first.microposts.first

The inheritance hierarchy for the User and Micropost models:

The inheritance hierarchy for the Users and Microposts controllers:

rails new sample_app --skip-bundle

rm -rf sample_app/.git

Download from Github using curl

curl --location --remote-header-name https://raw.githubusercontent.com/learnenough/rails_tutorial_7th_edition_gemfiles/master/sample_app/Gemfile_initial --output sample_app/Gemfile

Skip the pg gem for PostgreSQL in development and use SQLite for development and testing:

bundle config set --local without 'production'

bundle install

rails generate controller StaticPages home help

The inheritance hierarchy for the Static Pages:

Undo the created controller:

rails destroy controller StaticPages home help

Rails shortcuts:

Full command	Shortcut
`rails server`	`rails s`
`rails console`	`rails c`
`rails generate`	`rails g`
`rails test`	`rails t`
`bundle install`	`bundle`

mv app/views/layouts/application.html.erb layout_file

https://stackoverflow.com/questions/27814500/ruby-on-rails-provide-vs-content-for

mv layout_file app/views/layouts/application.html.erb

bundle exec guard init

curl --location --remote-header-name https://raw.githubusercontent.com/learnenough/rails_tutorial_sample_app_7th_ed/main/Guardfile --output Guardfile

bundle exec guard

nano ~/.irbrc

cat ~/.irbrc

IRB.conf[:PROMPT_MODE] = :SIMPLE
IRB.conf[:AUTO_INDENT_MODE] = false

rails console

curl -o app/assets/images/rails.svg -L https://cdn.learnenough.com/rails.svg

curl -OL https://cdn.learnenough.com/kitten.jpg

touch app/assets/stylesheets/custom.scss

https://github.com/rails/sprockets/blob/main/guides/how_sprockets_works.md
Inside of sample_app\app\assets\stylesheets\application.css the line *= require_tree . ensures that all CSS files in the app/assets/stylesheets directory (including the tree subdirectories) are included into the application.css. The line *= require_self specifies where in the loading sequence the CSS in application.css itself gets included.
Route and URL mapping for site links:

Page	URL	Named route
Home	/	root_path
About	/about	about_path
Help	/help	help_path
Contact	/contact	contact_path
Sign up	/signup	signup_path
Log in	/login	login_path

Generate a template test, called 'site_layout':

rails generate integration_test site_layout

https://www.rubydoc.info/gems/capybara/Capybara%2FNode%2FMatchers:assert_selector

rails test:integration

rails generate controller Users new

https://github.com/heartcombo/devise#starting-with-rails

rails generate model User name:string email:string

rails db:migrate

DB Browser for SQLite
Explore the data models is the Rails console:

rails console --sandbox

user = User.new

user.valid?

Save the User object to the database:

user.save

Find User by id:

User.find(1)

Active Record allows to find users by specific attributes:

User.find_by(email: '[email protected]')

User.first

User.first

user.email = "[email protected]"

user.email = "[email protected]"

user.save

user.reload.email

user.update(name: "The Dude", email: "[email protected]")

rails test:models

rails console --sandbox

user = User.new(name: "", email: "[email protected]")

user.valid?

user.errors.full_messages

Rubular: a Ruby regular expression editor

rails generate migration add_index_to_users_email

rails db:migrate

rails generate migration add_password_digest_to_users password_digest:string

bundle install

Creating and authenticating a user:

rails console

User.create(name: "Cos tin", email: "[email protected]", password: "testingPwd", password_confirmation: "testingPwd")

User.find_by(email: '[email protected]').password_digest

User.find_by(email: '[email protected]').authenticate('wrongPwd')

User.find_by(email: '[email protected]').authenticate('testingPwd')

!!User.find_by(email: '[email protected]').authenticate('testingPwd')

Rails comes equipped with three environments: test, development, and production. The default environment for the Rails console is development.
To run a console in a different environment (to debug a test, for example), you can pass the environment as an option to the console script:

rails console --environment test

If you have deployed your sample app to Heroku, you can see its environment using heroku run rails console.

puts User.find_by(email: '[email protected]').attributes.to_yaml

y User.find_by(email: '[email protected]').attributes

A Users resource:

User.count

User.first

rdbg + http://atdot.net/~ko1/activities/2021_rubyconf.pdf + https://edgeguides.rubyonrails.org/debugging_rails_applications.html#entering-a-debugging-session

(rdbg) @user.name
"Cos tin"
(rdbg) @user.email
"[email protected]"
(rdbg)

rails console

user = User.first

user.update(name: 'Constantin', email: "[email protected]", password: "parolaDemo", password_confirmation: 'parolaDemo')

user = User.new(name: "The coder", email: "mail@void", password: "ruby", password_confirmation: "ruby")

user.save

user.errors.full_messages

rails generate integration_test users_signup

rails db:migrate:reset

rails test
git add -A
git commit -m "Use SSL and the Puma web server in production"
git push && git push heroku
heroku run rails db:migrate

How to reset the production database:

heroku pg:reset DATABASE
heroku run rails db:migrate

URL for the production version of chapter 7 (sign up)
Generate the Sessions controller:

rails generate controller Sessions new

rails routes -c users
   Prefix Verb   URI Pattern               Controller#Action
   signup GET    /signup(.:format)         users#new
    users GET    /users(.:format)          users#index
          POST   /users(.:format)          users#create
 new_user GET    /users/new(.:format)      users#new
edit_user GET    /users/:id/edit(.:format) users#edit
     user GET    /users/:id(.:format)      users#show
          PATCH  /users/:id(.:format)      users#update
          PUT    /users/:id(.:format)      users#update
          DELETE /users/:id(.:format)      users#destroy

rails routes -c sessions
      Prefix Verb   URI Pattern             Controller#Action
sessions_new GET    /sessions/new(.:format) sessions#new
       login GET    /login(.:format)        sessions#new
             POST   /login(.:format)        sessions#create
      logout DELETE /logout(.:format)       sessions#destroy

curl -I http://127.0.0.1:3000 | grep Set-Cookie

rails generate integration_test users_login

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