Redirecting URL in Ruby on Rails

(Diary of an Old AI Researcher who is still Programming)

2 July 2019

I am retiring from University of Tokyo in March 2022, and, perhaps, my homepage in ailab.t.u-tokyo.ac.jp will be shut immediately at that time.
I have checked the access statistics of my home page and have found that the page titled `Difference between Engineering and Science' has an extremely high access score and is cited in several sites. So, I have decided to redirect the page in ailab.t.u-tokyo.ac.jp to the page in koichihori.tech right now.

However, this is not so easy, because my page is dynamically generated by my own program and I should rewrite my program.

It took a while before I recalled what my program, which I wrote six years ago, is doing. :-)

Finally, I have inserted the following four lines in one of my controller programs built in the framework of Ruby on Rails.
('status 301' means this redirection is permanent.)

 
 if params[:id] == "9"
     redirect_to("https://www.koichihori.tech/kougaku_jp.html", status: 301)
     return
 end

I do not think this is a beautiful solution, but, it is working.

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