porag-m06 / hellorailsapp

HelloRailsApp

Let's create an entire usable project with one simple line:

• rails new Project [Sets SQLite3 as the default DB]

But first,

Let's check to make sure that our system has the proper prerequisites installed. These include:

• Ruby (ruby --version)
• SQLite3 (sqlite3 --version) SQLite3 Website [And we can use postgreSQL instead as well]

And also check if rails is installed on our machine already by running:

• rails --version

If not, let's install rails & then we will also choose postgreSQL as our default DB during the creation of our first app.

To install rails & check version:

• gem install rails
• and check again by running rails --version

To set postgresql as the default database instead of SQLite3

• rails new ProjectName --database=postgresql

This will create a Rails application called ProjectName in a directory called ProjectName. Now go to

• cd ProjectName

and install all the gem dependencies that are already mentioned in Gemfile using

• bundle install

To Run/ Server the project:

• rails server or,
• bin/rails server or bin/rails s
• For windows run ruby bin\rails server

This will start up Puma, a web server distributed with Rails by default. To see your application in action, visit http://localhost:3000/ in your browser! PS: we can press Ctrl-C to stop the server.

Play with your first Rails website

After checking to make sure our Rails project is being served to the browser (http://localhost:3000/), there are a few things that need to be changed in order to set the display to let us view what we want.

• Let's use Rails' generators (known as scaffolding) to automagically make the files we need. For this you will do rails generate controller Pages hello in your shell, look at the example:

  $> rails generate controller Pages hello
  
      create  app/controllers/pages_controller.rb
       route  get 'pages/hello'
      invoke  erb
      create    app/views/pages
      create    app/views/pages/hello.html.erb
      invoke  test_unit
      create    test/controllers/pages_controller_test.rb
      invoke  helper
      create    app/helpers/pages_helper.rb
      invoke    test_unit
  

• Looking at the output of the command you will see all the generated things, but for now you only need to focus on one app/views/pages/hello.html.erb. You will put your HTML in this one.
• Open the file app/views/pages/hello.html.erb and add an h1 element saying "Hello world".
• Open http://localhost:3000/pages/hello in your browser. You should see your "Hello world" message.
• In config/routes.rb replace get 'pages#hello' with root 'pages#hello'
• Revisit http://localhost:3000/ and see your changes in action. Now your "Hello world" page should be displayed as the main page.

Rails Naming Convension

The default branch has been renamed!
hello-feature is now named main

If you have a local clone, you can update it by running the following commands.

git branch -m hello-feature main
git fetch origin
git branch -u origin/main main
git remote set-head origin -a