Pproject Tutorial

MongoDB Atlas

Import backup

mongoimport --uri "mongodb+srv://ppsiteadmin:password@cluster0-olrgl.azure.mongodb.net/pproject?retryWrites=true&w=majority" --collection discordUsers --drop --file ppdb_16092019.json

Ruby on rails Hello World

Install ruby on rails

Install Ruby on Windows

Donwload the installer from here: https://rubyinstaller.org/downloads/

Install it to a preferred path, but please don't use folder name with whitespaces in the path of i like Program Files!

Install Yarn

Yarn is the package manager solution for the Ruby on Rails. It was written mostly to change the nodejs package manager, npm and the RoR accepted as a package management solution. Download the Yarn from https://yarnpkg.com/lang/en/docs/install/#windows-stable

Check Ruby on Rails prerequisets

• ruby -v
• sqlite3 --version
• yarn -v

Install Ruby on Rails

gem install rails

Check wether the installation is successful: rails --version

Generate the tutorial project

• Navigate to a folder where you have RW permissions
• The project will be created in a new folder with the project name. So do not necessary to create an empty folder for the new project
• Use the rails new tutorial --api --skip-active-record command to create the project
• In some cases the sqlite3 integration can cause an issue during the deployment.
  • In the case above use the following command, gem install sqlite3 --platform=ruby -- --with-sqlite3-dir=<PATH>. Where the PATH is a preferred folder
  • navigate to the newly created folder and run bundle install to install the necessary gem packages

Start the Hello World API

You can start your first RoR web server with the following command: rails server Then open the http://localhost:3000/ in your browser, and voila, you have the Hello page of the project.

Connect to MongoDB

Why MongoDB?

I've chosen the MongoDB as a database, because it is not a normal SQL server, it has an API that you need to integrate, before the usage of the DB. This will emulate an integration step much more better, than a normal SQL connection, and demonstrate, how can we both call a 3rd party API, and use a DB.

MongoDB integration pre-requisites

• Open the tutorial project folder with your favourite code editor
• Open the Gemfile from the root
• Add the followings to the gem file, to before the develpment, and test groups:
  • gem 'mongoid', github: 'mongodb/mongoid' => We install this from git, because it was moved from the original developer to the MongoDB authority
  • gem 'bson_ext'
• Run bundle install from the terminal/command line

MongoDB Compass (Optional)

The Compass is a remote monitoring tool for the MongoDB databases and clusters

• Donwload the latest version from here
• Install the Compass
• Connect to the test cluster: Cluster0-shard-0/cluster0-shard-00-00-olrgl.azure.mongodb.net:27017,cluster0-shard-00-01-olrgl.azure.mongodb.net:27017,cluster0-shard-00-02-olrgl.azure.mongodb.net:27017
• Review the content

MongoDB Config YAML

Create a copy about the default.mongoid.yml in the /app/project folder, and name it to mongoid.yml Edit your brand new mongoid.yml file:

database: tutorial_<tutorial_id>
hosts:
        - Cluster0-shard-0/cluster0-shard-00-00-olrgl.azure.mongodb.net:27017
        - cluster0-shard-00-01-olrgl.azure.mongodb.net:27017
        - cluster0-shard-00-02-olrgl.azure.mongodb.net:27017
user: <tutorial_id>
password: '<tutorial_id>Pass'
roles:
        - '<tutorial_id>TutorialUser'

IMPORTANT! The mongoid.yml is untracked with git. Please DO NOT MODIFY the .gitignore file, and push the mongoid.yml file ever! If you'd like to create a brand new mongoid config file, run rails g mongoid:config from the terminal.

Seed the MongoDB collection

The mongodb is a NoSQL, so don't have any server schema structure. When you send documents to the server, if there is no collection for the documents, these will be created. We will use this information to seed our DB. Please check the content of the db/seed.rb file. This is a common seed file. You can use any available models to seed the db. The new collection name will be the class name with lowercase, and an 's' character on the end. So in our case the Meeting class in app/models/meeting.rb will generate a meetings collection. To seed the server you need to run the rake db:seed task.

Coding in Ruby

Create first view

Run the following command from the terminal: rails generate scaffold Todo title description finished:boolean

Check what's happened in the file structure:

• app/assets/stylesheets: new scss files
• app/controllers: new controller named todos_controller.rb
• app/models: new Todo model class
• test/controllers: test file for the new controller
• test/models: new model template
• test/system: the test main script

With these you can check the structure of a full form application written by rails. Open the http://localhost:3000/todos in a browser.

In the public folder you can find the basic application describers, and JS files generated once in case of every app.

Good luck with the learning of Ruby, I hope this tutorial helped you to create a development environment for your self-learning.