Bhumi guides active record basics

[bhumi1102]

The Active Record Basics Guide is a manageable size, so not a huge diff. I focused on making the language more friendly, updating code examples and testing all code examples in an app.

[Ridhwana]

This looks awesome 🎉 I left some feedback and a few suggestions that could be food for thought to hear your preferences.

[carlosantoniodasilva]

Updates are looking great, other than what's already been reviewed, I had just some minor feedback here and there.

[bhumi1102]

Likewise, would it make sense to add an example of generating a model, which gives you the AR model + migration code? Could be a simple bin/rails generate model Book title:string author:string to show how it could generate all that's been showed in section 3, to close it.

Yeah I think that's a useful tip to give the reader. The difference between rails g migration and rails g model. I added it a NOTE at the end of section 3.

[bhumi1102]

we have an example of how to generate a migration within the guide, but would it be any useful to add one to the migration section itself? Not sure.

I started adding this but then it lead to explaining the references and what that means. I think that's better left to the Migration guide itself, which this section links. I could change the example from Publication to Book for a simpler generate command but felt that using Book again was getting a little repetitive/boring so I left it as is 😅