Rails Rake任务更改数据库中的列值

Question

A tabel in my pgsql database has a column named "duration" which currently stores a string such as.. "5m 21s".. meaning 5 minutes and 21 seconds.

I am creating a rake task to reformat these to just be the total amount of seconds.

So "5m 21s" would become "321".

... right now I could write something such as this but I am unsure how to build the query itself.

desc 'Change call duration format'
task calls_format_fix: :environment do

    # Service::CallsReport.where('duration')... 
    # all nums before 'm' * 60 + nums before 's'.. then remove all alpha characters.. (do this with regex? ([0-9]*)m\s+([0-9]*)s)

end

Answer 1

Figured it out! This is my code and query with comments of what I am doing to achieve changing the column values. Not sure that this is the best solution but it works!

desc 'Change call duration format from minutes and seconds to just seconds' 
task calls_reformat: :environment do

   #store all calls in durationValues
   durationValues = Service::CallsReport.all

   #loop through each as 'call'
   durationValues.each do |call|

     #regex to capture minutes and seconds
     call.duration.match(/([0-9]*)m\s+([0-9]*)s/)

     #store the first match ($1) and multiply it by 60 in minToSec
     minToSec = $1.to_i * 60

     #add minToSec to matched seconds from regex ($2)
     totalValue = minToSec + $2.to_i

     #update the value of call duration
     call.update(duration: totalValue)
   end
end