RUBY ON RAILS - CRUD

    // CREATE A CRUD DATABASE 
    Create Schema  / Migration
    rails g scaffold friends first_name:string last_name:string email:string phone:string twitter:string
    -> This creates a model, a database table called "friends" with the columns and the types
    It creates many things: migration, routes,
    in db folder there is a migrate folder with the data of the table

    PUSH the migration live
    rails db:migrate
    -> Creates a schema file in migrate folder

    Now in views there's a friends directory
    it will create a scaffolds.scss that could conflict with Bootstrap, then delete

    This creates a fully functioning CRUD automatically that works. Creates the pages, methods, database
    in routes (config) it will add automatically  resources :friends
    In the video example, it creates new links in the navBar to add friends, edit friends, read friends

    // STYLE APP WITH BOOTSTRAP <
    Tables, buttons
    Alerts when user has been CREATED
    _Alerts.html.erb copy the alert code
    <%= notice %>
    <%= if notice %>
        <%= render 'layouts/alerts' %>
    <%= end %>

    // GEM FILES <
    Ruby Gems we will use Devise
    Add to the Gemfile file: gem 'devise', '~> 4.8'

    Go to terminal> bundle install 
    rails generate devise:install -> It would inform of things we have to add/change
    go to congif > environments development.rb and production.rb (when uploading web to heroku)

    add rails g devise:views

    rails generate devise USER - generate a user's table with name user (name can be changed)

    Push the migration:
     rails db:migrate

     LOGIN SIGN UP SIGN IN SIGN OUT
     <%= if user_signed_in? %>

    //STYLE DEVISE VIEWS <
    Log in log out etc
    carpeta views > devise
    

    // <