FrozenError - can't modify frozen String (ruby 2.5+)

Question

I'm trying to update ruby in our project to 2.5 and up, and bundler from 1.17.2 to 2.0.1. After doing so, running our application produces the following error in multiple places:

FrozenError - can't modify frozen String:

This is a result of trying to set the timezone in a controller (Time.zone = current_user.location.time_zone) among other places.

Answer 1

You can use Time.use_zone(zone) with a block, for example:

class ApplicationController < ActionController::Base
  around_action :set_time_zone

  def set_time_zone
    if logged_in?
      Time.use_zone(current_user.location.time_zone) { yield }
    else
      yield
    end
  end
end

https://api.rubyonrails.org/classes/Time.html#method-c-zone-3D