[Rails] Re: update rails version from 2.x to 5.x in an existing very old rails application

Ruby on Rails Friday, February 1, 2019

I just halted on an upgrade project due to time constraints. Rails V3 Ruby 1.9.3
It has so many abandoned Gems I had to stop at Rails 3.2.25 and Ruby 2.1
Thankfully it had good test coverage. That was a huge help.
Remember when we started whitelisted attributes in the model and then it was moved to the controller? There's a lot of moving code around.

If you incrementally upgrade you can eventually use 
rails app:update # Update configs and some other initially generated files (or use just update:configs or update:bin)
to help

I would also upgrade bundler to 1.13. You have better control over updating gems. https://bundler.io/man/bundle-update.1.html
https://medium.com/cedarcode/reduce-fear-of-bundle-update-with-this-4-step-process-e021e8808c48

My advice un upgrading is the same advice you get when you go white water raftering, and they talk about if you get stuck under the boat, "Pick a direction and go. Don't turn around."
also, git commit often. :-)

John

On Friday, February 1, 2019 at 2:50:32 AM UTC-5, raj kumar wrote:
I have a Rails app, made 10 years back in 2009 with following version:
rails version = 2.0.2 
ruby version = 1.8.7
Database = PostgreSQL

Now what steps I should adopt in order to upgrade it to latest version of ruby and rails i.e.,
rails version = 5.2
ruby version = 2.6
Database = PostgreSQL

As per up-gradation rule here(https://edgeguides.rubyonrails.org/upgrading_ruby_on_rails.html), I need to start up-gradation one by one version gradually like,
2.x to 3.x
3.x to 4.x 
4.x to 5.x

My question here is, 
Is there any other way to directly update it from 2.x to 5.x?

Note: I can develop it by scratch but my client not agree on that, they just asking for update in existing app not build from scratch in latest version of Ruby on Rails.

Kindly provide your thoughts.

Thanks 

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Posted by Ruby on Rails at 7:49 AM

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